Fire Resistance Ratings: 1961. Supplement No. 2 to the National Building Code of Canada

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FIRE RESISTANCE RATINGS

StJPPLEMENT No. 2

NATIONAL BtJILDING CODE OF CANADA

TABLE OF CONTENTS

FIRE ENDURANCE OF WALLS

Table 1 Solid Brick • •

Table 2 Hollow Brick

• • • • • • • •

Table 3 Cored Brick. . • • • •

Paae

6

7

8

Table 4

~tructural

Tile

• • • • •

Table 5 Structural TUe (Furred and Cavity) •

Table 6 Steel Framed, Brick Veneered. •

• • • • • 9

• • • • • 12

• 13

.13

Table 7 Monolithic Concrete. • • • • •

Table 8 Hollow Concrete Masonry Units •

• • • • • 14

Table 9 Hollow Concrete Masonry Units (Cavity)

Table 10 Wood Stud Exterior . • . • • • • • • • • •

Table 11 Reinforced Concrete. • • . . • • •

FIRE ENDURANCE OF PARTITIONS

• 16

• 17

• 18

• 18

Table 12 Steel Studt Hollow Construction (Load-beart.q) .

Table 13 Prefabricated Reinforced Concrete Units

• • • .

Table 14 Wood Stud . . . . • . • •

• • 19

Table 15 Hollow Clay TUe . . • • . .

. • • •

Table 16 Hollow Concrete Unit Masonry

• • • • • • • •

Table 17 Gypsum Block. • . • • • . . . . • •

Table 18 Composition Block

• • • • • • •

• 19

.23

.25

• 27

.1:1

Table 19 Steel Stud, Hollow Construction (Non-load-bearln&)

• • 28

Table 20 Steel Framed, Solld • • • • • •

Table 21 Studleu Reinforced Solld Plaster.. •

Tr.ble 22 BuUt-Up and Prefabricated Wood. • • .

FIRE ENDURANCE OF ROOFS AND FLOORS

Table 23 Concrete Slab •• • • • • • • •

Table 24 Concrete Slabs on Precast Concrete Joista •

Table 25 Clay Tile and Concrete Slabs • • • • •

• • 29

• • • • • 30

· • . • • 31

.32

33

• • • 33

Table 25A Concrete Joist

• . . • . • • • • •

. 34

Table 26 Steel Joist Aaaembltea includina Steel Beams •

• 35

Table

1:1

Steel Plate Floors •

• • • • • 37

Table 28 Cellular Steel Floors. •

• • • • • • 39

Table 29 Wood Jolsted • • • •

• • • •

41

FIRE ENDURANCE OF COLUMNS

Table 30 Concrete Protected Steel

•

• • • • • • •

• 43

Table 31 Cinder Concrete Blocks, TUe, Gypsum Block Protected Steel. '"

Table 32 Plaster Protected Steel • • •

• • • • • • 45

Table 33 Steel Pipe and Cast Iron. •

• • • • • • 46

Table 34 Reinforced Concrete •

. • • • • • 47

Table 35 Timber • • • • • • • • • • • • • • • • • 48

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3

FIRE RESISTANCE RATINGS

INTRODUCTION

The fire resistance ratings included in this document are substantially the same as those formerly in Appendix 4.1.B of the National Build-ing Code 1953. Major changes are beBuild-ing considered by the Associate Committee on the National Building Code who are establishing a fire rating board to study and interpret all fire test reports and establish fire resistance ratings. This proposed program will take some time before it is effective, however, and it is hoped that this revision of the old Appendix 4.1.B will continue as a useful source of information in conjunction with the Code until this can be done.

The requirement of the National Building Code for fire endurance is that a construction should have been tested in accordance with the Standard Methods of Fire Tests of Building Construction and Materials (ASTM E119-58) of the American Society for Testing Materials and/or Fire Tests on Building Material and Structur-es, B.S. 476, Part I, 1953, of the British Standards Institution.

The information included in the following tables covers forms of building construction which have bee.l tested in accordance with the standard test as it applied when the test was made. The design of the furnace and of the test sample establish con-ditions which are intended to simulate as far as possible conditions which would arise in an actual fire and to provide a uniform basis for comparing the results.

This list of fire resistance ratings is not intended to be exclusive. There are available many additional reports of tests meeting the requirements of the National BUHding Code. These have been omitted from this document, some because of copyright restrictions, some because they cover proprietary products whose exact description the manufacturer is unwilling to disclose and a considerable number of British tests that are alreadv available in a

convenient form. .

The followin~ list of references covers additional

information which may be found to be useful as a source of further material.

1. Building Materials List published by

Under-writers' Laboratories Inc. and available from Underwriters' Laboratories of Canada, Scar-borough, Ontario. The Building Materials List includes a compilation of constructions tested in accordance with the standard method of test and retained under the

Under-writers' Label and J nspection Service. A large

number of proprietary constructions are covered in this booklet which is also a valuable source of information on fire endurance and the fire hazard classification of building materials (flame spread).

2. National Bureau of Standards, Washington, has published a number of papers on fire endurance. These include the more common forms of construction such as brick walls, concrete floors, etc. The Building Materials and Structures Reports of this organization may be obtained from the Superintendent of

Documents, U.S. Government Building

Offices, Washington 25, D.C.

The following is a list of some of the publications on fire endurance since 1940.

BMS71 Fire Tests of Wood and Metal Framed

Partitions

BMS113 Fire Resistance of Structural Clay Tile Partitions

BMS117 Fire Resistance of Walls of Lightweight

Aggregate Concrete Masonry Units BMS120 Fire Resistance of Walls of

Gravel-Aggregate Concrete Masonry Units BMS123 Fire Tests of Wood-Framed Walls and

Partitions With Asbestos-Cement Facings

BMS124 Fire Tests of Steel Columns Protected With Siliceous Aggregate Concrete

BMS131 Fire Tests of Gunite Slabs and

Partitions

BMS134 Fire Resistance of Concrete Floors BMS135 Fire Tests of Steel Columns Encased

With Gypsum Lath and Plaster

BMS141 Fire Endurance of Open-Web

Steel-Joist Floors With Concrete Slabs and Gypsum Ceilings

BMS143 Fire Tests of Brick Walls.

3. There are two British publications which cover much of the testing program of the British Fire Research Station. These are: (a) Investigations on Building Fires, Part 5,

Fire Test on Structural Elements, Na-tional Building Studies Research Paper No. 12, H.M. Stationery Office, London, 1953.

(b) Sponsored Fire Resistance Tests on Structural Elements by L. A. Ashton and P. M. T. Smart, Dept. of Scientific and Industrial Research and Fire Offices Committee Joint Fire Research organiza-tion, H.M. Stationery Office, London, 1960.

Some of the British tests have been on forms of construction not in common use in Canada such as brick cavity walls but many could be directly

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applied to Canadian conditions; in general the British test results provide a valuable source of additional information.

Format of Tables

The tables present the tIre endurance periods which have been assigned by the respective testing agencies, except where indicated.

The tables are so arranged that all necessary factual information concerning anyone test can be found on one page or, in a few cases, on following pages. All information concerning the application of these data is to be found in this introduction.

Each table has been arranged in the following manner. Where any term, such as "unplastered" , appears in several tables it is always abbreviated by the same symbol, i.e. (UP). Such terms are always abbreviated with letters in brackets and the explanation of these abbreviations is to be found at the bottC'm of the page. Where any note or term applies to one table only the explanation is found in the column headed REMARKS.

Evaluation of Construction

Not Listed in the Tables

Where the details of a system or an assembly vary slightly from those already tested. it is pos-sible. based on experience and research. to make a satisfactory estimate of the performance of the assembly or to interpolate between the results of other tests. The following notes may be of assist-ance in evaluating such assemblies:

(0

In any fire-resistive assembly. assuming that

everything else remains the same. greater thichness increases the fire resistance of the construction; when interpolating between two thicknesses it is safe to assume a linear relationship;

..

(ii) (iii) (iv) (v)

Throughout the tables the quality of materials is specified; considering the much smaller degree of accuracy with which fire loads in occupancies and fire conditions in building can be predicted, certain variations in the materials specified would appear to be permissible;

It is important to note the kind of plaster.

its thickness. the type and proportions of the ingredients. the type of plaster base and the spacing of its fastenings. The richness of gypsum plaster mix has a considerable effect on the fire resistance and. other things being equal, the mix should be equivalent to those specified in comparative tests. In the att,pchment of plaster bases to wood con-struction nailing is critical-an increase in spacing or the use of thicker or shorter nails than those specified may severely reduce the

fire endurance. Under test conditions

cement-coated or barbed nails have gener-ally performed better than plain nails; The fire resistance of concrete depends on the kind and quality of aggregate used. Siliceous gravel aggregates which contain a large percentage of chert or flint show. marked disruptive effects under fire expo-sure, whereas limestone, trap rock and a number of other aggregates exhibit only minor cracking and spalling under similar conditions. The degree of restraint of slabs is also important, thus a slab restrained on four sides is not as effective as a slab that is free to expand on two or more sides; For hollow constructions and constructions composed of hollow units the thickness of the hollow spaces is a relatively minor factor in fire resistance. Comparative tests indicate that the main factor is the total thickness of the solid material rather than the total thickness of the unit or construc-tion. The use of a thicker unit, therefore. will only increase the rating as the thickness of the solid material is increased.

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~ quality of 'ing the much ith which fire conditions in ain variations L1ld appear to ind of plaster, Jwportions of aster base and The richness

'l considerable

:i, other things

! equivalent to

e tests. In the to wood con-an increase in )r shorter nails rely reduce the st conditions Is have gener-lin nails;

•

~te depends on ggregate used. 'hich contain a or flint show. lder fire expo-lp rock and a s exhibit only \' under similar straint of slabs • ' b restrained on lS a slab that is e sides; d constructions he thickness of ~Iatively minor nparative tests :or is the total 'ial rather than lit or construe-unit, therefore, lS the thickness lsed.

s

REFERENCES

1. Fire-resistance classification of building con-structions, National Bureau of Standards Report BMS92, 1942.

2. Fire-resistance and sound insulation ratings for walls, partitions and Roors, National Bureau of Standards, Technical Report on Building Materials, TRBM-44, June 24, 1946. 3. Fire-endurance and hose-stream tests of

wood-framed partitions with facings of gypsum-perlite plaster on gypsum lath, National Bureau of Standards, Report TR 10219-78: FP 2931, June I, 1950.

4. National Fire Protection Association Handbook of Fire Protection, eleventh edition, '1954. 5. Underwriters' Laboratories Inc. Retardant

Report 2689, dated December 18, 1939.

6. Underwriters' Laboratories Inc. Retardant Report 2773, dated August 31, 1944.

7. Underwriters' Laboratories Inc. Retardant Report 2773, dated September 12, 1944. 8. Underwriters' Laboratories Inc. Retardant

Report 2993, dated December 9, 1948. 9. Underwriters' Laboratories Inc. Retardant

Report 2689, dated December 13, 1949. 10. Underwriters' Laboratories Inc. Retardant

Report 3453, dated February 13, 1952. 11. Investigation of fire-endurance and hose-stream

test of 2' solid studless partition, Ohio State Engineering Experimental Station, Project No. T162, December 1950.

12. Report of, a fire-endurance test made upon a steel joist Roor, University of Columbia Report No. FW 69, May 1932.

13. Fire endurance of open-web steel joist Roors with concrete slabs and gypsum ceilings, National Bureau of Standards Report BMSI41, 1954.

14. Underwriters' Laboratories Inc. Retardant Report 2773: dated November 29, 1950. 15. A fire-endurance test of a wood-joisb.d floor

with ceiling of vermiculite-gypsum plaster on metal lath, National Bureau of Standards, Report TR 10218-20: FP 2984a, December IS, 1950.

16. Underwriters' Laboratories Inc. Retardant Report 2851, dated May 14, 1953.

17. Underwriters' Laboratories Inc. Retardant Report 3187-4-5-7, dated July 30, 1952.

18. Underwriters' Laboratories Inc. i ... etardant

Report 3187-6, dated August 7, 1952. 19. Underwriters' Laboratories Inc. Retardant

Report 2851, dated May 10, 1949.

20. Fire resistance testa of plywood-covered wall panels. United States Dept. of Agriculture,

Forest

Se.

vice, Forest Products Laboratory.

No. R1257, November 1940.

21. Underwriters' Laboratories Inc. Retardant Report 3653, dated August 18, 1954.

22. Underwriters' Laboratories Inc. Retardant Report 3390-8, dated March 12, 1953.

23. Underwriters' Laboratories Inc. Retardant Report 3390-15, dated August 29, 1956.

24. Underwriters' Laboratories Inc. Retardant Report 3390-9, dated July 6, 1953.

25. Underwriters' Laboratories Inc. Retardant Report 3390-4, dated January 30, 1952.

26. Underwriters' Laboratories Inc. Retardant Report 3390-3, dated January 25, 1952.

27. Underwriters' Laboratories Inc. Retardant Report 3390-6, dated July 25, 1952.

28. Underwriters' Laboratories Inc. Retardant Report 3390-18, dated June 22, 1957.

29. Underwriters' Laboratories Inc. Retardant Report 3390-10, dated January 13, 1954.

30. Underwriters' Laboratories Inc. Retardant Report 3390, dated November 6, 1951.

31. Underwriters' Laboratories Inc. Retardant Report 3390-5, dated May 23, 1952.

32. Underwriters' Laboratories Inc. Retardant Report 3390-7, dated August 26. 1952.

33. Underwriters' Laboratories Inc. Retardant Report 3390-12, dated October 4, 1954.

34. Underwriters' Laboratories Inc. Retardant Report 3390-17, dated May 31, 1957.

35. Underwriters' Laboratories Inc. Retardant Report 3390-16, dated March 12. 1957.

36. Underwriters' Laboratories Inc. Retardant Report 3390-19. dated July 10, 1957.

37. Underwriters' Laboratories Inc. Retardant Report 3390-11. dated January 19, 1954.

38. Underwriters' Laboratories Inc. Retardant Report 3390-13, dated November 12, 1954.

39. Fire Endurance Test of a Wood-Joisted Floor with Gypsum Lath and Reinforced Lightweight Plaster Ceiling Test No. 256, Report T210218-16: FP2925 of U.S. National Bureau of Standards.

40. Underwriters' Laboratories Inc. Retardant Report 3653-3, dated May 15. 1956.

41. Underwriters' Laboratories Inc. Retardant Report 2851-5.6, dated May 15. 1956.

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TABLE 1 Fire Endurance of Solid Load·Bearing Brick Walll

--

ENDURANCE Thickness (in.) No Combustible Ref. Combultible Ref. Remarks Type of Construction Brick-face to brick-face Framed-in Members (page 5) Framed-in Members (page 5) 1~ houn ~UP} I, 2

1mJ::'1.

Load

"

1" houn PO} 1 Wa la" inches thick-SO pounds/square inch 2).i houn (PP) I, 2 Walll 8 inches or thicker-l60 pounds/square inch SOLID WALLS S hours (UP) 1, 2 2 (UP) 1,2 MortarMb: CLAY OR SHALE 8 6 hours (PO) 1 2~ (P) I, 2 Walla" inches thick-l:l:6 portland cement lime. BRICK 7 houn (PP) I, 2 2~ (PP) I, 2 Walla 8 inches or thicker -1 : 1:6 portland cement hours ~UP) hours (UP) lime or 1:3 portland cement or 1:3 lime. 10 1 8 1 12 10 houn PO) 1 '> hl)urs (P) 1 Plaater 12 hours (PP) 1 Where plaster ia indicated it ia 1:3 sanded IYpllum 1~ hours (UP) plaster not leas than ~ inch thick. 1. 2 4 2 hours (PO) 1 CombU8t1ble Framed-Ill Memben 0\ 3 houn (PP) 1. 2 E::J. combultible member pr~ected a maxi-SOLID WALLS mum 4 inches into the walla an W'U protected 7 houn (UP) I, 2 2 ~ hours (UP) I, 2 by " inches of solid ma!lOnry on ita top. bottom. and SAND LIME 8 8 hours (PO) 1 3 hours (P) 1,2 lidea. BRICK 9 hours (PP) I, 2 10 hours (UP) 1 '> hl)urs (UP) 1 12 10 hours (PO) 1 '> hours (P) 1 12 houn (PP) 1 1 ~ hours (UP) I, 2 4 2 hours (PO) 1 3 hours (PP) 1,2 SOLID WALLS 6 hours (UP) 1,2 2~ hl)urs (UP) 1,2 8 7 hours (PO) 1 3 hl)urs (P) 1. 2 CONCRETE BRICK 8 hours (PP) 1,2 12 houn (UP) 1

I

8 hours (UP) 1 12 12 hours (PO) 1 9 hours (P) 1 16 hours (PP) 1 (UP) Unplutered (I') PIutered on ~ IIide (PI) Pllllltered on... (PO) PJutered 011 one Ikh (PI') PIuilered 011 both 1Iid.

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12 12 hours (PO) 16 houl'8 (PP) 'J nf)urs \I I (UP) Unplutered (P) Plutered on erpoIIed IlkS. (PI) Plutend on IMIde (pO) Plutered on one lIkSe (PP) PWtend 011 both Pie!

•

•

TABLE 2 Fire Endul1ll1Ce 01. Hollow Load-Bearing Brick Wan. ENDURANCE Thickness (in.) No Combustible Ref. Combustible Ref. Type of Construction Brick-face to brick-face Framed-in Members (page 5) Framed-in Members (page 5) HOLLOW (CAVITY) WALLS 5 hours ~UP) 1,2 2 hours (UP) 1,2 9-10 6 hours PO) 1 2~ hOUf8 (P) 1,2 CLAY OR SHALE 7 hours PP) 1,2 2~ hours ~UP~ 1,2 HOLLOW ROLOK 8 3 hoUl"8 PO 1

•

•

WALLS 4 hOUl"8 (PP) 1,2 CLAY OR SHALE 5 hours ~UP) 1 12 6 hours PO) 1

•

•

7 hoUl"8 PP) 1 8 4 hOUl"8 ~P) 1 HOLLOW ROLOK 5 hours PO) 1 BAK WALLS 12 10 hours

~U~

1 CLAY OR SHALE 10 hours PO 1

•

ENDURANCE OF HOLLOW ROLOK WALLS UNDER TEST CONDITIONS SHOWN Combuao'ble Members Projectinc from one or two aides 2 1 2 2 2 1 2 Hollow spaces around enda 01. combum'ble memben-611ed or not no no no no yes no yes Number 01. sides pwtered 0 0 1 2 0 2 2 Endurance 8 inches

-2~ 1 1~

IH

2 4 Reference (page 5) 1 1 1 1 1 1 1 Endurance 12 inches 3~ 6 3 4

-5 9

1-

--

r-

--Reference (page S) 1 1 1 1 1 1 1 (UP) Uaplutend (P) PIutered «qICIIeIl1kte (PI) l'Iutere4 oalulde (PO) PIutered lID _1Ide (PP) PIuteed lID boCII. ....

•

Remarks Hollow (Ca .... ty) W .... Built of two wythes 01. brick laid flat with U-ioeb metal tie between them for each 3 equare feet 01. wall area. Aver:r; working load

Urn:-area) pounda/equare iiich Ma:aimum st:reu for eocentric loading • 80 poundaleqWU'e ioeb Mortar mix-l:1:6 portland cement lime. 8 Iach Hollow R.o1ok W .... Built with the outside COUl'IIetI of brick laid on

....

edge wlth alternate header bricb on edp .. required by the design,

lea:!!l.

a 3 to 3J+iaCb air apace in the middle of the A~ worki~ load

<va!-area> 1 pounda aqWU'e loeb Mortar mix-l:1:6 portIud cement lime. GENERAL: Comb_dble lI' ... ecI· .. M_ben E~ combustible member projected a maximum 01. 4 lDches into the walla and was protected by 4 inches 01. eoIid IDUODI')' on ita top, bottom and

lides. Plater Where

pWter' is indicated it is 1:3 sanded IYpaum plaster not Jess)ban

H

inch thick.

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TABLE 3 Fim Endurance of Load.Bearing Cored-Brick Walls - ---DETAILS OF CONSTRUCTION ENDURANCE (" ombustible Imposed Thickness (in.) Units in Cells in Minimum Solid No Combustible Load Type of Brick-face to Wall Wall Material in Units Framed-in Ref. Framed-in Ref. lb./sq. inch Remarks Construction brick-face Thickness Thickness (%) Members (page 5) Members (page 5) 2 ~ hours (UP) 2,3 1 hour (UP) 1,2 Mortar Mlx-l:l:6 port-8 1 3 hours (PO) 2 1~ hours (P) 1,2 land cement lime. 4 hours (PP) 2, 3 PJuter 1 70 120 Where plaster is indicated CORED 5 hours (UP) 2 3 hours ~UP) 2 it is 1:3 sanded mum BRICK 12 6 hours (PO) 2 4 hours P) 1 plaster not less than inch WALLS 7 hours (PP) 2 thick. 2 CombU8t1ble Framed-in CLAY 5 hours (UP) 2,3 2 hours (UP) 1,2 OR 8 2 6 hours (PO) 2 2~ hours (P) 1, 2 Members SHALE 7 hours (PP) 2 , Every combustible member 87 160 projected a maximum of 10 hours (UP) 2 8 hours (UP) 1 4 mches into the walls and 12 3 3 10 hours (PO) 2 9 hours (P) 1 was ~tected by 4 inches 12 hours (PP) 2 of so id masonry on ita top, bottom and sides. 00 (UP) Uaplutered (P) Plaatered OD ezs-d Ilde (PI) Pl81ter~ OD lnalde (PO) Plaatered on one lllde (PP) Plutered OD both .Idee

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TABLE 4 Fire Endurance of Load-Bearing Structural Tile Walls Thickness ENDURANCE

I

(in.) Combustible Tile (ace Units in Cells in Minimum Solid No Combustible Type of to Wan Wall Material in Units Framed-in Ref. Framed-in Ref. Remarks Construction tile (ace Thickness Thickness (%) Members (page 5) Members (page 5) 45 minutes (UP) I, 2 Impo8ed Load 1~ hours (UP) 1,2 1)4 hours (UP) (F) I, 2 -SO pounds/square incb o( gross area. 1 2 40 2 hours (PO) 1 1~ hours (P) 1,2 2 hours (P) (F) 1,2 Mortar Mis 3 hours (PP) 1,2 2~ hours (PP) (F) 1,2 -1:1 :4 portland cement lime. 8 45 minutes (UP) ." hours (UP) 1,2 1,2 Plalter 1 ~ hours (UP) (F) 1,2 Where plaster is indicated it refers 1 3 or 4 40 2~ hours (PO) 1 1~ hours (P) 1,2 to 1:3 sanded tttp8um plaster not less 2~ hours (P) (F) 1,2 than ~ inch Ide. 3 ~ hours (PP) 1,2 2~ hours (PP) (F) 1,2 Structural Tile 2 hours (UP) 1,2 The percentage of solid material in 2~ hours (UP) 1 2~ hours tP) (F) 1,2 units, in the case o( walls built-up of 3 hours P~ 1 units of different designs, is to be TILE 1 3 40 3~ hours (PO) 1 3~ hours P (~

•

taken as the weighted average (or the WALLS 4 hours (PP) 1 4 hours (PP) ( ) 1 units at the COUI'IeS in the wall where 12 the average percentage is lowest. CLAY OR 2 hours (UP) t SHALE 3~ hours (UP) 1 3~ hours ~UP) (F) 1 Combuatlbl. Framed-In Memben 2 3 or 4 40 4 hours (PO) 1 3 hours P) 1 Every combustible member projected 4 hours (P) (F) 1 a maximum o( 4 inches into the walls 6 hours (PP) 1 6 hours (PP)( (F) 1 and was protected by 4 inches o( solid masonry on its top, bottom, and 5 hours (UP) 1 4 hours (UP) 1 sides. 16 2or3 40r5 40 6 hours (PO~ 1 5 hours (P) 1 8 hours (PP 1

'"

13-i hours (UP) 1,2 45 minutes (UP) 1, 2 1~ hours (UP) (F) 1,2 1 2 43 2 hours (PO) 1 1~ hours (P) 1,2 2 hours (P~ (F) 1,2 3 hours (PP) 1,2 23-i hours (P ) (F) 1,2 8 2 hours (UP) 1,2 45 minutes (UP) 1,2 2 hours (UP) (F) 1,2 1 3 or 4 43 3 hours (PO) 1 .~ hours (P) 1,2 23-i hours (P) (F) 4 hours (PP) 1,2 23-i hours (PP) (F) .,2 (UP) Unpluterecl (P) Plutered on ea~ .&de (PP) Plutered on both... (F) Hollow lpae8 aroWld combuatlble _ben filled 1OI1d1:v with mortar or muonf)'

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TABLE 4 (Continued) Fire Endurance-of Load-Bearing Structural Tile Walls Thickness ENDURANCE (in.) Tile face Units in Cells in Minimum Solid Nc Combustible Combustible Type of to Wall Wall Material in Units Framed-in Kef. Framed-in Construction tile face Thickness Thickness (%) ;\If embers ~page 5) Members 6 hours (UP) 1 4 hourR (UP) 16 2 or 3 4 or 5 43 7 hours (PO) 1 5 hours (P) 9 hours (PP) 1 3 hours (UP) 1 2~ hours (UP) 3 hours (UP) (F) 12 1 3 45 4 hours (PO) 1 3~ hours (P) 4 hours (P) (F) 5 hours (PP) t 5 hours (PP) (F) TILE 4 hours (UP) 1 2~ hours (UP) WALLS 4 hours (UP) (F) 12 2 3 or 4 45 5 hours (PO) 1 3J.i hours (P) CLAY OR 5 hours (P) (F) SHALE 6 hours (PP) 1 6 hours (PP) (F) 1~ hours (UP) 1 1 hour (UP) 8 1 2 46 27i hours (PO) 1 1 ~ hours (UP) (F) 1% hours (P) 2~ hours (P) (F) 3~ hours (PP) 1 2~ hours (PP) (F) 7 hours (UP) 1 5 hours (UP) 16 2 or 3 4 or 5 46 8 hours (PO) 1 6 hours (P) 10 hours (PP) 1 (UP) Uaplaatv'ed (P) Plutered on e:Jtl)OIIed aide I PI) Plaatered on in'ide (pO) Plastered on one aide (PP) Plaatered on both Iidee (F) Hollow apace. around, combuatible members filled IOlidly with mortar or masonry Ref. (page 5) 1 1 1 1 1 1 1 1 1 1 1 1 1,2 1,2 1,2 1,2 1,2 1 1 Remarks ~

o

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-TABLE 4 (Continued) Fire Endurance of Load-Bearing Structural Tile Walla

_

... _ .. -Thickness ENDURANCE (in.) Tile face Units in Cells in Minimum Solid No Combustible Combustible Type of to Wall Wall Material in Units Framed-in Ref. Framed-in Construction tile face Thickness Thickness (%) Members (page 5) Members 2~ hours (UP) 1,2 1 hour (UP) 2 hours (UP) (F) 1 3 or 4 48 3~ hours (PO) 1) 1~ hours (P) 2~ hours (P~ (F) 4 hours (PP) 1,2 2~ hours (P ) (F) 8 2 hours (UP) 1, 2

lU

hours (UP) 2 hours (UP) (F) 1 2 49 3 hours (PO) 1 2 hours (P) 2~ hours (P) (F) 4 hours (PP) 1,2 2 ~ hours (PP) (F) 3~ hours (UP) 1 3 hours (UP) 12 1 3 49 4 3~ hours (UP) (F) hours (PO) 1 4 hours (P) 4 hours (P) (F) TILE 6 hours (PP) 1 6 hours (PP) (F) WALLS 8 hours (UP) 1 5 hours (UP) CLAY OR 2 or 3 5 or 6 49 9 hours (PO~ 1 6 hours (P) SHALE 11 hours (PP 1 16 9 hours (UP) 1 6 hours (UP) 2 or 3 5 or 6 51 10 hours (PO) 1 7 hours (P) 12 hours (PP) 1 3 hours (UP) 1,2 1

U

hours (UP) 2 hours (UP) (F) 8 1 3 or 4 53 4 hours (PO) 1 2 hours (P) 2~ hours (P) (F) 5 hours (PP) 1,2 2~ hours (PP) (F) 5 hours (UP) 1 3 hours (UP) 5 hours (UP) (F) 12 2 3 or 4 53 6 hours (PO) 1 4 hours (P) 6 hours (P) (F) 7 hours (PP) 1 7 hours (PP) (F) 10 hours (UP) 1 7 hours (UP) 16 2 or 3 5 or 6 53 11 hours (PO) 1 8 hours (P) 13 hours (PP) 1 Ref. (page 5) 1,2 1, 2 1,2 1, 2 1,2 1,2 1.2 1,2 1,2 1,2 1 1 1 1 1 1 1 1 t 1, 2 1,2 1,2 1,2 1,2 1 1 1 1 t 1 1

=

(UP) Unplutered (PI Plutered on ell~ llide (PP) Plaatered 011 both ald. (F) Hollow apaca around ClOIDbllltlble membenJ filled solidly with mortar or masonry

•

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Type

or

Construction CLAY

OR

SHALE BRICK FACED Type

of Construction CLAY OR SHALE Thickness (in.) of wall of Brick Face Tile Face 8 ₁₂ Thickness of

brick _{face (in.)} 4

Details of Construction 8-inch 40 per cent solid tile plus 2-inch furring tile. Two 3~ inch 40 per cent solid tiles with 2-lOch air space between. TABLE 4 (Continued) Fire Endurance of Load-Bearing Structural Tile Walla Structural Tile ENDURANCE Thickness Minimum Solid No Combustible

I

of Unit Material in Units Framed-in Ref. (in.) (%) Members (page 5) Remarks 3~ hours (UP)

I~

Impoeed Load 4 40 4 hours (PI) 80 pounds/aquare inch. 6 hours (UP) MortarMa 8 40 7 hours (PI) 1 :1:4 portland cement lime. 8 70 10 hours (UP) Pluter Where plaster is indicated it is ~ inch of 1:3 sanded gypsum. TABLE 5 Fire Endurance of Load-Bearing Furred and Cavity Walls of Structural Tile ENDURANCE No Combustible Remarks Framed-in Ref. Members (page 5) 3~ hours (P) 1 Impoeed Load 5 hours (PP) 1 80 pounds/square inch. 4 hours (PP) 1 Mortar Mix 1:1:4 portland cement lime. Pla.ter and Stucco Not less than ~ inch portland cement plaster or stucco outside and % inch gypsum plaster inside is required to develop these ratings. (UP) Unplutered (P) Plutered on ~ aide (PI) Plutered on lnaide (PO) Plutered on one .Ide (PP) Plastered on both .idea (F) Hollow ~ around combulllible memben filled lOUdly wltb mortar or mBllOnry

-N

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lIS

!

I

~

;

~

~

a

i

SHALE Two 3~ inch 40 per cent solid tiles with 2-mch air space between. 4 hours (PP) MortarMh 1 :1:4 portland cement lime. Pluter and Stucco Not less than ~ inch portland cement plaster or stucco outside and ~ inch gypsum plaster inside is required to develop these ratings. (UP) Ullplutend (P) Plastered 011 ~ lide (PI) PlMtend 011 IDaIde (PO) Plutend OD one lide (PP) Plastered on both .Idee (F) Hollow IJ)llC:ellU0und combultlble membent filled IOlldly wltb mortar or muonry

•

•

TABLE 6 Fire Endurance of Load-Bearing Steel-Framed Brick-Veneered Walla ENDURANCE Type of Details of Plaster Side Ref. Brick-faced Construction Construt"tion Exposed (page 5) Side Exposed PROTECTED On one side of 1 inch magnesium oxyaulfate wood fibreboard STEEL sheathing attached to studs, 1-mch air space and J~ inch FRAME brick secured with metal ties to steel frame every fifth course. 1~ hours 1 'hours (NO Inside facing of Y'-inch 1:2 sanded gypsum plaster on metal lath secured directly to studs. COMBUSTIBLE SHEATHING) Same as above except with inside facing of Y'-inch venniculite 2 hOUri I 4: hOUri plaster. PROTECTED On one side of paper·backed, wire lath attached to studs and 3,,·inch brick veneer held in place by filling a 1·inch space STEEL between the brick and the 18th with mortar. Inside facing of FRAME I-inch !:tper-enc1011led mineral wool blanket weighing 0.6 " hoUrI 2 5 hoUrI

~O

=

lIQ,uare foot attached to studs, metal lath or paper-OOMB STIBLE Wlre lath laid over the blanket and attached to the SHEATHING) studs, and "-inch sanded gyp!IUm plaster 1:2 for the scratch coat and 1:3 for the brown coat. PROTECTED On one side of ~ inch wood fiberboard sheathing next to studs. "-inch air ~ formed with ,,-by IH-inch wood STEEL stripe c.~ over e fiberboard and secured to the studs; FRAME paper-wire lath nailed to these strips, 3" inch brick 1~ hours 2 4: hours (COMBUSTIBLE veneer held in place by filling a "-inch space between the brick and paper-backed lath with mortar. Inside faci:f of SHEATHING) ~tnch i~um plaster on metal lath attach to inch pi stripe secured to ~ of the studs. TABLE 7 Fire Endurance of Load-Bearing Monolithic Concrete Wan. (lee &lao Table 11) Ref. (page 5) 1 1 1 1 Type of Thickneaa Ref. Loadinl( ColUltruction Details of Construction (In.) ENDURANCE (page 5) pounds/eq. IRch Concrete made of portland cement, 45 minutes 100

,

(failure under load) 2 MONOLITHIC Potomac River siliceous ~ravel and CONCRETE sand. Mix by volume 1:2 :3~ 6 2~ hOUri (no load failure) 2 300 8 5 hours (no loe.d failUft) 2 200

-Remarks Endurance times ~IY to the indi-cated facings eecu to lightweight steel studs not leaa than 3 inches in depth. The spacing of the studs win be governed by the I~, the ratings being for loads Tt~ a atrea of not more than ,12 p>unds/equare inch of the net area of the steel studs for brick-veneered walla. The spacing of the studs is to be such as to dord adequate ~ty to the metal·lath or gypsum-ter base. Remarb Reinforcement of 4:-by 4:-inch No. 6 wire-we1ded fabric near the centre plane of the wall. No ntinforcement.

-<oN

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TABLE 8 Fin Endurance of Load-Bearing Walla of Hollow Cooerete Muonry Unita ENDURANCE Thideneaa (in.) Between Inner Unita in Cella in Minimum Solid No Combustible Combuatible Type of and Outer Wall Wall Material in U nita Framed-in Ref. Framed-in Co_truction Fa<:es of U nita Thicltneaa Thaden .. (%) Members (page 5) Members

IlihO"'T

PJ

3 houn (UP) 1.2 2 houn UP (F) 8 I 1 55 la hOUri P) 4 hOUri ~PO~ 1 2 hoUrI P~ (Fh 5 hOUri PP 1.2 2 hours P )( 5 hOUri

{U~

1.2 2 hOUri ~UP) 10 1 1 60 6 hOUri PO 1,2 2)i hOUri p) 7 houn PP) 1.2 EXPANDED SLAG l)i hoUrI ~UP~ OR 4 hoUrI (UP) 1 2 hOUri UP (F) PUMICE 8 I 1 62 2 hoUrI

r~

AGGREGATE 5 hOUri (PO~ 1.2 2 hOUri P ( 6 hOUri (PP 1

2~

hOUri P

)~)

houn

~U~

3 1.2 1 1 70 4 houn PO 1 5 houn PP) 1.2 6 3)i hOUri (UP~ 1,2 I 1 76 4 hOUri ~PO 1 5 houn PP) 1,2 45 minutes (UP) 2 houn ~UP~ 1,2 2 hOUri ~UP) (F) 8 1 1 52 2)i hours PO 1

la

hOUn p) EXPANDED 2 hoUrI ~P~ (F~ BURNED 3)i houn (PP) 1,2 2 hours P ) ( CLAY OR

-SHALE,

IJi

hou"rp)

CRUSHED

•

houn (UP) 1 -I hOUri Up) (F) LIMESTONE, 12 1 1 55 2 hOUri P) AIR-COOLED 5 hOUri (PO) 1 5 hOUri P~ (F~ SLAG,OR 6 hOUri (PP) 1 6 hoUrlP)() CINDERS 4 hoUrI

~UP~

1,2 l)i houn (UP) 10 1 1 60 5 hOUri PO 1 2 hOUri 6 houn PP) 1,2 (UP) Ua.pIuUnd (P) PIIIIItued 011 1I.qIOIed.we (PI) PIIIIItued 011 budde (PO) Plutered 011 _ IIde (PP) Plutered 011 bodllldel (P) Hollo- ...--&rOUIId comlMlldble _ben 8lIed mlIdlJ' with mortar or IIIUOIITY

-Ref. Remarks (page 5) 1,2 ImpoMdLoed 1.2 80 pounds/equate inch of 1.2 II'OU area. 1,2 1.2 Mortar Mix 1.2 1:1:6 portland cement Iim~ 1,2 Plaeter Where puter i. indicated it refers to not leu than 1,2 ~nch of 1:3 sanded gypsum 1,2 P ter. 1,2 1,2 Combu.tlbl. Jl'ramed-In 1,2 MembVe Every oombustible member projected a maximum of 4 inches into the walls and

:;

was protected by 4 inches of solid maaonry on its top. bottom, and sides. 1.2 1,2 1,2 1,2 1,2 1.2 1,2 1,2 1,2 1,2 1,2 1,2

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.."

~

~

~

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AYk~5:D

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CINDERS . 10 1 1 60 5 6 4 5 6 hours (PO) hours (PP) hours

WP)

hours PO) hours Pp) 1,2 1 1,2 (UP) UapIuUnd (P) Pluterecl_ G'.JIOIICIIide (PI) PIuterecl _ IJlIIIde (PO) Plut.ered _ one lide (PP) Plut.erecl _ both .... (P') Hollo".1** arouad. combutlble memllen 8IIed lOUdly with mortar or DIUOI1rY

.

-

1 ABLE 8 (Continued) 5 6 hours

(p)

(F) hours (PP) (F) 1~ hours (UP) 2 hours Fire Endurance of Load-Bearing Walls of Hollow Concrete Muonry Unitl ENDURANCE Thickness (in.) Combustible Between Inner Units in Cells in Minimum Solid No Combustible Type of and Outer Wall Wall Material in Unitl Ref. Framed·in 1; 2 1,2 1,2 1,2 Construction Faces of Units Thickness Thickness (%) Framed-in Ref. Members (page 5) Members i (pa~e 5) 2 H hours ~UP) 1.2 8 3 hours PO) 1 4 hours (PP) 1,2 1 I 62 5 hours (UP) 1 12 6 hours (PO) 1 1 hours (PP) 1 5 hours (UP) (B1) 1 8 6 hours (PO) (Bl) 1 EXPANDED

.

2 1 62 BURNED 4 hours (UP) (B2) 1 CLAY OR 872 5 hours (PO) (B2) 1 SHALE. CRUSHED _LIMESTONE 3H hours (UP) 1 AIR·COOLED 2 2 65 4 ~ours (P) 1 SLAG. OR CINDERS 5 hours (PP) I 1 hours (UP) I 13 3 3 65 8 hours (P) 1 9 hours (PP) 1 3 hours (UP) 1,2 8 1 1 10 4 hours (P) I 5 hours (PP) 1,2 12 minutes (UP) 1 8 1 1 54 12 minutes (P) 1 SILICEOUS 30 minutes (PPj 1 SAND AND

---GRAVEL, 5 hours (UP) 1,2

OR~RE

2 2 55 6 hours (P) 1 QUARTZ, CHERT, OR 12 1 hours (PP) 1,2 FLINT 25 minutes (UP) 1 1 1 51 25 minutes (P) 1 6 hours (PP) 1,,2 (UP) Uaplutered (P) I'Iutetd on ~ -'de (PI) Pluteed on In.lde (PO) Pluteted on one -'de (PP) Plutered on both aIdeI (F) Hollow I1*S _nd combu.tlble membm filled lOUdly with mortar or mUOIll7 (81) lJ,(·1bch bridt face (81)

""·Ineh

brick f_ 1 hour (UP) 1.2 2 hours (UP) (F) 1.2 Itt hours (P) 1,2 2 hours (P) (F) 1,2 2H hours (PP) (F) 1,2 2 hours (UP) 1,2 5 hours (UP) (F) 1,2 2H hours (P) 1,2 6 hours (P~ (F) 1,2 1 hours (P ) (F) I I~ hours (UP) 1 2 hourll (UP) (F) I

la

hours (P) 1 2 hours (P (F 1 2 hours

(P~)

(h

1

..

hours (UP) 1 1 hours (UP) (F) 1 5 hours (P) 1 8 hours (P~ (F) 1 8 hours (P ) (F) 1 IH hours (UP) 1.2 2 hours ~UP) (F) 1.2 2 hours P~ 1,2 2H hours (P (F) 1,2 2H hours (P ) (F) 1,2 12 minutes (UP) 1 30 minutes (PP) 1,2 2 hours (UP) 1.2 5 hours ~UP) (F) 1,2 2H hours P~ 1,2 6 hours ~P (F~ 1,2 1 hours PP) ( ) 1,2 25 minutes _(UP) 1 272 hours (PPj 1,2

•

Remarka

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TABLE 9 Fire Endurance of Load.Bearing Cavity Wall. of Hollow Concrete Maaonry Units Minimum ENDURANCE Thickness (in.) Solid Between Inner Units in Cells in Material No Combustible Combustible Type of and Outer Wall Wall in Units Framed-in Ref. Framed-in Construction Faces of Units Thiclcness Thiclcness (%) Members (page 5) Members EXPANDED BURNT CLAY OR SHALE, 3~ hours ~UP) 1,2 1~ hours (UP) CRUSHED LIMESTONE, 4 hours P) 1 2 hours (P) AIR-COOLED SLAG, 5 hours (PP) 1,2 OR CINDERS EXPANDED SLAG 4 hours (UP) 1,2 1 ~ hours (UP) OR PUMICE 10 2 2 62 5 hours (P) 1 2 hours (P) AGGREGATE 6 hours (PP) 1.2 CALCAREOUS SAND AND GRAVEL. 1 ~ hours (UP) 1. 2 1 ~ hours (UP) COARSE AGGREGATE 1~ hours (P~ 1 1" hours (P) 60% OR MORE CALCITE 5 hours (P ) 1,2 AND DOLOMITE (UP) Unp!utered (P) PIMten!d on ~ tide (PI) Plutered on IMIde (PO) Plutered on one ,leSe (PP) P!utered on botl!. IIdeI (P') HolIow...-arvuad CQlllbutlble memben filled IOlldly with mortar or muonrY Ref. (page 5) 1,2 1 1, 2 I, 2 1,2 1. 2 Remarks Impo4ted Load 80 pounds/square inch of gross area. Mortar Mix 1 : 1:6 portland cement lime. Plaster Where plaster is indicated it refers to not less than

31i

inch of 1:3 sanded gyp-sum plaster. Air Space The width of the air space equals 2 inches.

-0\

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...

=

s

8

i

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--

TABLE 10 Fire Endurance of Load-Bearing Wood Stud Exterior Wan.

-_

... _-Type of Construction Outside Facing Inside Facing Fill ENDURANCE ~-inch wood sheathing, 4-inch stripe of ~-inch Full thick mineral asbestos felt weighing thick gypeum board wool batta weighing 14 pounds/IOO square over the edges of the 1 ~ pounds/square 1 ~ hours (EE) feet and S/32-inch cement studs under facin~ foot. asbestos shingles ,,"inch cement-as tos board. 4-inch stripe of ~-inch Full thick mineral 45 minutes(EO) gypsum board over the wool batts weighing edges of the studs 1 pound/square foot. 40 minutes (El) under facing of ,,-inch cement asbestos board. WOOD STUD ,,-inch board consist-Ing of ~-inch wood None 30 minutes(EE) fifjre faced with }i-inch cement asbestos. Mineral wool 35 minutes (EE) "-inch T &: G boards ~-inch T &: G boards. None 20 minutes (EE) (Ill) 6re ~ OIl .... f_ (EO) 6re eapoare OIl OIltlllde f_ (ltE) Ire eapoare OIl ... ,... Ref. (page 5) 1 I 1 1 1 1

•

Remarks Impoaed Load 360 pounds/square inch on net JeCtional area of studs. Con,tructlon Not .. The ratings given are for the indicated fa~ applied to 2-by 4-inch nominal w studs of No. I Common or better grade, set edgewise, spaced 16 inches on centres, having wood plates at top and bottom, and stayed transversely with wood blockinf located to form sUPl:rt at the horizonta joints of the board acings • Nailing of Cement-Albeetoe Board, Note:-In connection with nailing B.M.S.92 states: "When the cement asbestos boards or shi~1es are eecured by counter sunk nails, the oles drilled for the nails Ihould be 0.02 to 0.03 inches smaller than the nail head and care should be taken that the nails are driven 10 as not to injure the -cement-asbestos material. For the boards in the test partitions, 6d cuing nails were found to be the m(MIt suitable, particularly if the heada are to be counter sunk". MbleraJ Wool Batt. The weights of mineral wool batts

aC

sq uare foot refer to the net area of the Ii space.

-

"""

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TABLE 11 Fire Endurance of Non-Bearing Reinforced Concrete Walls (see Table 4.1.B.7) -~ --_._ ... -Type of Thickness Ref. Construction Details of Construction (in.) Endurance (page 5) Remarks CONCRETE Concrete made of portland cement, Potomac River 4 1~.houn 2 Reinforcement of 4-by 4-inch No.6 wire-welded fabric siliceous gravel and sand. Mix by volume 1 :2~:3~. near the centre plane of the wall. TABLE 12 Fire Endurance of Load-Bearing Steel-Stud Hollow Construction Partitions ~-Total Details oj Construction Wall Type of Thickness Plaster mix Plaster Thickness Ref. Remarks Construction (in.) Facing on both sides with by weight (in.) Endurance (page 5) Portland cement and sand with 1 :2.1 Impoeed Load

.x

25 pounds lime putty and 3 pounds ~ 40 minutes 2 7,270 pounds/square inch of the net area of asbestos per bag of cement. 1:3.2 the steel studs.

a;

Portland cement and sand with 25 • ifloaded not to exceed 5,120 pounds/square pounds lime putty and 25 pounds inch of the net area of the studs the rating. asbestos per bag of cement for 1:1.1 45 minutes 2 will be 2~ hours. scratch coat, and 25 pounds putty 1:1.6 and 37~ pounds asbestos per bag Conatruct!on Notea 4~ of cement for the brown coat. ~ Stud&-Studs were of I section formed of STEEL two 3-by I-inch by 16-gauge steel channels, STUDS 1:2 45 minutes 1,2 welded back to back with a narrow space 1:3 between to receive nails. 1 :2 1 hour 1 Studs were spaced 24 inches on centres and 1:2 attached t03.!1-by 12-inch bt 16-gaugerunner Gypsum chan~els, or beanng plates y means of self-1 :2 1 hour 1 tapping screws. 1:3 4~ ~ Metal Iath-Only stiffened expanded metal 1:2 1~ hours 1,2 laths were used, on load bearing steel stud 1:2 partitions. These were fastened with Simplex nails or No. 6 common wire nails driven lOto 4~ Wood-fibered Neat ~ 1~ hours 1,2 nailing slots along the edges of the studs. Gypsum 2· hours 5 1 1,2

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"II

=

;

~

~

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"II

a

~

III

-~

1:2

=9'~hOU"

~

laths were used, on load beanng steel stud 1:2 partitions. These were fastened with Simplex nails or No.6 common wire nails driven Into Wooo-fibered Neat ~ 17!1 hours 1,2 nailing slots along the edges of the studs. Gypsum 1 2* hours 1,2

•

•

•

TABLE 13 Fire Endurance of Load-Bearing Partitions of Prefabricated Reinforced Concrete Units Type of Wall Ref. Construction Thickness (in.) Details of Construction Endurance (page 5) Remarb PREFAB RICA TED Prefabricated metal-reinforced concrete wall units, separate units for Impoeed Load each face. connected with wood splines and metal pins, the assemblr; 45 minutes 1 250 pounds/linear foot of wall. REINFORCED forming

a

5-inch masonry wall with I-inch faces and 3-by 13-inc 5 continuous vertical air spaces. CONCRETE UNITS Same as above with all spaces filled with "nodulated" mineral wool weighing not less than 10 poundt/cubic foot. 2 hours 1 TABLE 14 Fire Endurance of Load-Bearing Wood Stud Partitions Plaster Type of Facings of Plaster Thickness Ref. Remarks Construction on Metal Lath on Both Sides (in.) Endurance (page 5) Neat gyP.8um

"

1~ hours 1 Impoled Load 1 :2, 1:2 gypsum with mineral wool fill

"

1~ hours 1,2 360 pounds/square inch of net area of studs. 1 :2, 1:3 gypsum with mineral wool fill

11

1~ hours 1 1 :2, 1:3 gypsum with mineral wool fill

"

1~ hours 1 Con.tructlon Notea 1 :2, 1:2 gypsum

~

1 hour 1,2 Studa-2-by 4-inch yellow pine or Douglas Fir spaced 1 :2, 1:3 gypsum 1 hour 1,2 16 inches on centres in a single row, except as noted. 1 :2, 1:3 gypsum

"

4S minutes 1,2 1 :2, 1:3 portland cement ~ 30 minutes 1,2 Metal Lath-The expanded metal lath and wire lath were 1 :2, 1:3 portland cement

11

45 minutes 1,2 nailed to the wood studs an nearly all instances with 6d common 1 :1/30:2, 1 :1/30:3 portland cement and asbestos fiber

"

4S minutes 1,2 wire nails spaced not over 7 inches on centres on each stud 1 :1/30:2, 1 :1/30:3 portland cement and asbestos fiber

~

1 hour 1,2 driven to about 1 inch depth and bent over. The overlapped 1:4,1:7.5 lime 30 minutes 1,2 edf: of laths were tied midway between studs with No. 18 WOOD 2:1:8,2:1:10 lime and k:land cement

"

30 minutes 1,2 ga vanized wire ties. S11JD 2:1:8, 2:1:12 lime and eene', cement

"

4S minutes 1,2 Mineral Wool G~um vermiculite in proportions as follows: Mineral wool fil\ was made with paper-backed battsof nominal ratch coat-l00 pounds fibered gypsum to 4-inch thickness and weighed from 1 to 1.4 pounds/square foot. 2~ cubic feet vermiculite

"

1 hour 6 Brown coat -100 pounds fibered gypsum to Pla.ter 3 ~ cubic feet vermiculite Thickness of plaster is measured as follows: on metal lath-from face of stud. Facings of Plaster on other lath-from face of lath. on Fiberboard Lath on Both Sides Plaster mixes are proportioned bt weight of dry materials, the first two values given being for t e scratch coat, the second 1 :2, 1:2 KO,}'um plaster on ~ inch fiberboard two for the brown coat. weighing . pounds/square foot. ~ 35 minutes 1,2 1 :2, 1:2 j!psum plaster on

11

inch flame-proofed Fiberboard fiberboar weighing 2.8 pounds/square foot as treated. ~ 1 hour 1,2 Fiberboard in the ~ inch thickness used as a plaster base was nailed with 3d or 4d common wire nail. spaced 4 to 6 inches on centres. Fiberboard in the

11

inch thickness was nailed with Sd nail •. Plaster mixes were ~roportioned by weight of the dry materials, the first of two va ues being, for scratch coat, the second the brown coat.

-'0

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Type of Construction WOOD STUD TABLE 14 (Continued) Fire Endurance of Load-Bearing Wood Stud Partitions Plaster Facin~ of Plaster Thickness Ref. on Gypsum th on Both Sides (in.) Endurance (page 5) I :2, 1:2 ~ypsum plaster on ~ i nch ~sum board or 45 minutes 1,2 lath, plam, indented or perforated wit area of holes less than 2~ per cent of lath area. I :2, 1:2 gypsum plaster on perforated gypsum lath having one ~-inch diameter hole or larger per not more than 16 square inches of lath surface. 1 hour 1,2 Neat wood-fihued gypsum plaster on gyJ>:lum lath. ~ 1 hour 1,2 1:2 1:2 gypsum plaster on gypsum lath WIth 1 ~-by 1 ;.1-inch metal lath pads nailed 8-inch centres verti-cally and 16-inch centres horizontally. 1 hour 1,2 1 :2, 1:2 gypsum plaster on gypsum lath nailed to two rows of studs with stag~ered spacings, and filled with mineral wool batts weIghing 0.9 pounds/square foot. 1 hour 2 1 :2, 1:2 gy'hum plaster on ~rforated gypsum lath overlaid wit 2-by 2-inch by o. 16 gauge wire fabric ~ fastened to two rows of studs with staggered spacings. 1;,( hours 2 Gypsum-~rlite on perforated gypsum lath in propor-tion as fo lows: scratch coat and brown coat: 100 pounds gypsum-cement plaster to 2~ cubic feet of aggregate ~ (loose volume). 1;,( hours 3 Gypsum-vermiculite in proportion as follows: scratch coat and brown coat: 100 pounds gypsum-cement plaster to 2~ cubic feet of aggregate (loose volume). 1;,( hours 3 1-Remarks N o.

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~

~

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1:'1'

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s.-TA.BLE 14 (Continued) Fire Endurance of Load-Bearing Wood Stud Partitions -- --- --- --Plaster Type of Facings of Plaster Thickness Ref. Construction on Wood Lath on Both Sides (in.) Endurance (page 5) 1:2. 1:3 gyr;um plaster 30 minutes 1 1:6~. 1:6" lime, Keene's cement and sand with mineral wool batt fill weighing 1.4 pounds/square foot. ~ 30 minutes 2 1:5, 1:7~ lime 30 minutes 1,2 1 :2. 1:2 gypsum 35 minutes 2 1 :5, 1:7 lime plaster with mineral wool batt fill weighing 1.4 pounds/square foot. ~ 40 minutes 2 1 :5, 1 :7~ lime plaster with blown mineral wool fill weighing 2.2 poundshquare foot. ~ 45 minutes 1,2 2:1 :12, 2:1 :18 lime, Keene's cement and sand with mineral wool batt fill weighing 1.4 pounds/square foot. 1 hour 2 3:1:8, 3:1:12 lime, Keene's cement &nd sand with WOOD mineral wool batt fill weighing 1.4 pounds/square foot. ~ 1 hour 2 STUD 1 :2, 1:3 gypsum plaster with mineral wool batt till weighing 1.05 to 1.25 pounds/square foot. I hour 1,2 Facings of Board Facing Thickness Both sides Without Plaster (in.) Gypsum wall board with /lame-proofed cotton batt fill weighing 3 ounces/square foot. ~ 30 minutes 2 Gypsum wallboard 40 minutes 1, 2 Cement-asbestos board with mineral wool batts weighing 1 pound/square foot. ~ 40 minutes 2 Gypsum wallboard with mineral wool batt fill weighing 45 minutes 0.6 to 1.2 pounds/square foot. or 1 hour if 1.2 ~ non-bearing Gypsum wallboard on two rows of studs with mineral wool batt till weighing 2.2 pounds/square foot. I hour 2

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Remarks N

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Type of Construction WOOD STUD TABLE 14 (Continued) Fire Endurance of Load-Bearing Wood Stud Partitions Facings of Board Facing Ref. Thickness Both Sides Without Plaster (in.) Endurance (page 5) Gypsum wallboard on two rows of studs with mineral wool batt fill weighing 2.4 pounds/square foot. 3-i 1 hour 2 Two thicknesses of ij;"inch gypsum wallboard on two rows of studs wit fiberglass blanket weighing 0.6 pound/square foot. ~ 1 hour 2 ~-inch gypsum wallboard overlaid with ,.-inch cement-asbestos board.

"

1 hour 1,2 4-inch strips of ~ inch gypsum board over edges of studs under facings of ,.-inch cement-asbestos boards with mineral wool batt fill weighing 2 pounds/square foot.

"

1 hour 1 3-i-inch gypsum sheathinl plus ~inch gypsum wall-board on two rows of stu s with mineral wool batt fill weighing 1.1 pound/square foot.

J.i

1~ hours 1,2 2 thicknesses of 3-i-inch gypsum wallboard on two rows of studs. 1 1~ hours 2 3-i-inch gypsum sheathing plus ~-inch gypsum wall-board on two rows of studs with 1 ply of 15 pound/ 100 square foot asbestos paper between facing boards. IJ.j 1~ hours 2 2 stud walls separated by 3-i inch, with adjacent facings of 3-i-incb gypsum sheathiqg, and outside facings of 3-i-inch gypsum wallboard. ~ 1~ hours 2 3-i-inch gypsum wallboard overlaid with ,.-inch cement-asbestos board.

%

1~ hours 2 3-i-inch gypsum sheathin~ plus ~-inch gypsum wall-board on two rows of stu s with fill of two thicknesses of mineral wool batts weighing 2 pounds/square foot.

J.i

13-i hours 2 Ys-inch cement-asbestos boards over 3-i-inch gyrsum sheathing on two rows of studs with mineral woo batt 13-i hours fill weighing 2.2 pounds/square foot. % 2 gypsum wallboard on two rows of studs with fill of cement, gypsum and ashes. ~ 2 hours 2 Remarks N W

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fill weighing 2.2 pounds/square foot. % 1~ hours 2 ~inch cement-asbestos boards over ~-inch gyrsum ~ sheathing on two rows of studs with mineral woo batt gypsum wallboard on two rows of studs with fill of cement, gypsum and ashes. ~ 2 hours 2

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~ .f TABLE 15 Fire Endurance 01 Non-Bearinr Hollow Clay Tile PartitiolUl Details of Structural Wall Wall Minimum Solid Type of Thickness Cells in Wall Material in Units Construction (in.) Kind of Tile Thickness (%) Exposure Dense hard-10 minutes (UP) burned clay or 20 minutes (PN) shale 30 minutes (P) 45 minutes (PP) 3 50 Medium-burned 20 minutes ~UP) clay tile 20 minutes PN) 45 minutes (P) 1 hour (PP) 1 Dense hard-10 minutes (UP) burned clay or 20 minutes (PN) shale tile 30 minutes (P~ 45 minutes (P ) Medium-burned 20 minutes (UP) clay tile 25 minutes (PN) 45 minutes (P) 1 hour (PP) 40 Dense hard-1 ~ hours (UP) burned clay or 1 ~ hours (PN) PARTITIONS shale tile 1 1~ hours (P) OF (Filled with broken ·2 hours (PP) HOLLOW 4 tile, crushed stone, CLAY Medium-burned slag, cinders, or sand 1~ hours (UP) TILE Clay tile mixed with mortar.) 1 hours (PN) 1~ hours (P~ 2~ hours (P ) Dense hard-15 minutes (UP) burned clay 01' 25 minutes (PN) ,bale tile 45 minutes ~P) 1 hour ( P) 50 Medium-burned 25 minutes (UP) clay tile 30 minutes ~PN) 1 hour ( ) 1 ~ hours (PP) 1 Dense hard-15 minutes (UP) burned clay or 25 minutes (PN) abale tile 45 minutes (P) 6 30 1~ hours (PP) Medium-burned 20 minutes (UP) clay tile 25 minutes ~PN) 1 hour ( ) 13-i hours (P)P

-(UP) UDpIutered (P) "-erect OD apoeed IIde (PP) PIutend OIl both .... (PH) PIMtend OD IIIIBPI*d ...

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Ref. Remarka (page 5) 1 MortarMb 1 1:1:<& cement lime. 1 1 Plalter 1 Where plaster is indicated it refers to ~inch IYpeum. 1 1 1 1 1 1 _1,2 1 1 1 1,2 1

t:

1 1 1 1 1 1 1 1 1 1 1,2 1 1 1 1,2 1 1 1 1,2 1 1 1 1,2

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TABLE 15 (Continued) Fire Endurance of Non-Bearing Hollow Clay Tile PartitioDll Deta;is of Structural Wall Wall Minimum Solid Type or Thickness Cells in Wall Material in Units ReL Construction (in.) Kind of Tile Thickness (%) Exposure (page 5) Dense hard-2 hours (UP) 1 burned clay 2r2 hours (PN) 1 or shale I 2r2 hours (P) 1 (Filled with broken 3r2 hours (PP) 1 tile. crushed stone. 30 Medium-burned slag. cinders, or sand 2 hours (UP) 1 clay tile mixed with mortar.) 2r2 hours (PN) I 2r2 hours (P) I 3r2 hours (PP) 1 6 Dense hard-20 minutes (UP) 1 burned clay 30 minutes (PN) 1 or shale 1 hour (P) 1 1 ~ hours (PP) I 1 40 Medium-burned 25 minutes (UP) 1 clay tile 40 minutes (PN) 1 172 hours (P) 1 172 hours (PP) 1 Dl'nse hard· 25 minutes (UP) 1 burned clay 35 minutes (PN) 1 or shale I hour (P) 1 PARTITIONS 50 1 ~ hours (PP) 1,2 OF Medium-burned 30 minutes (UP) I HOLLOW clay tile 45 minutes (PN) 1 CLAY I~ hours (P) 1 TILE 1r2 hours (PP) 1,2 4 Dense hard-30 minutes (UP) 1 burned clav or 40 minutes (PN) I shale 1~ hours (P) 1 1 r2 hours (PP) 1,2 2 60 Medium-burned 35 minutes (UP) clay tile 1 hour (PN) 1r2 hours (P) 2 hours (PP) '. Shale or 45 minutes (UP) dense hard-1 hour (PN) burned clay I~ hours (P) I~ hours (PP) '. 6 Medium·burned 1 hour (UP) 1,2 clay tile 45 I~ hours (PN) 1 I~ hour~ (P) 1 2 hours (PP) 1,2

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---Shale or dense Double shells, plus 20 minutes (UP) 1 4 hard-burned one cell 30 minutes (PN) 1 clay 45 minutes (P) 1 1 ~ hours (PP) 1 Medium-burned

I

Double shells. plus 25 minutes (UP) 1 _!.J}~_~ 4 clay tile one cell 4S 35 minutes (PN) 1 1 hour (P) 1 PA", . I 1 IV1~;' I 1~ hours (PP) 1 (UP) UnDlao'~red (P) Pl ... tered on ul'l<'Md Bid. (PP) PlllIItered on both aid"" (PN) Pllllltered on un""""",d .id~

...

Remarks ~

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- ---Shale or dense Double shells, plus 20 minutes (UP) I 4 hard-burned one cell 30 minutes (PN) 1 clay 45 minutes (P) 1 1 ~ hours (PP) 1

•

HOLLOW Medium-burned

I

Double shells, plus 25 minutes (UP) 1 WALL 4 clay tile one cell 45 35 minutes (PN) 1 TILE 1 hour (P) 1 PARTITIONS I 1}2 hours (PP) 1

--(UP) Unplut"ted (P) Plaateted on u~ (PPl

..

." TABLE 16 Fire Endurance of Non-Bearing Hollow Concrete Unit Masonry Partitions -Details of Structural Wall Wall Cells in Minimum Solid Ref. Type of Thickness Wall Material in Units Construction (in.) Kind of Aggregate Thickness (%) Exposure (page 5) 1 hour (UP) 1 3 73

IH

hours (PO) 1 2 hours (PP) 1,2 134' hours (U P) I, 2 62 1

%

hours (PO) 1 272 hours (PP) I, 2 4 172 hours (UP) 1,2 73 2 hOurs (PO) 1 Ex~nded slag or 272 hours (PP) 1,2 pumice aggregates I 172 hours (UP) 1,2 49 2 hours (PO) 1 272 hours (PP) 1,2 PARTITIONS 2 hours (UP) 1,2 OF 6 62 272 hours (PO) 1 HOLLOW 3H hours (PP) 1,2 CONCRETE 1 MASONRY 3 hours (UP) 1,2 UNITS 73 4 hours (PO) 1 5 hours (PP) 1, 2

---45 minutes (UP) 1 3 73 134' hours (PO) 1 1% hours (PP) 1,2 1 hour (UP) t, 2 Crushed limestone, 65 1~ hours (PO) 2 blast furnace slag, 2 hours (PP) 1, 2 4 cinders, and expand-ed burned cia y or 134' hours (U P) 1,2 shale. 73 1 % hours (PO) 1 2 hours (PP) 1,2 134' hours (UP) I, 2 6 49 1% hours (PO) 1 2 hours (PP) 1,2 (UP) Unplutered (PO) Plastered on one side (PP) Plastered on both aides Remarks Mortar Mix 1:1:6 portland cement lime Plaster ~ inch of 1:3 sanded gypsum plaster

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to.,) tit

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TABLE 16 (Continued) Fire Endurance of Non-Bearing Hollow Concrete Unit Masonry PartitiOOll Detail. of Structural Wall Wall Cells in Minimum Solid Type of Thickness Wall Material in Units Ref. Remarks Construction (in.) Kind of Anregate Thickness (%) Exposure (page 5) 45 minutes ~P) 1 3 73 l~ houn ( ) ] 1 a houn (PP) 1,2 1 hour (UP) 1,2 65

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houn (PO) 1 2 hours (PP) 1,2 4 1~ houn (UP) 1,2 Crushed limestone, 73 1 houn (PO) 1 blast furnace

:.':1'

2 houn (PP) 1,2 cinden and span -ed burned clay or l~ hours ~UP) 1,2 PARTITIONS sbale. 49 1 a hours PO) 1 OF 2 houn (PP) 1,2

~

HOLLOW 1 CONCRETE l}i houn (UP) 1,2 M2\SONRY 6 62 2 houn (PO) 1 UNITS 2}i houn (PP) 1,2 2}i hours ~UP) 1,2 73 3 houn PO) 1 4 houn (PP) 1,2 Calcareous sand and 20 minutes (UP) 1 gravel, coane aggre-62 30 minutes ~PO) 1 gate 60% or more 1" houn ( P) 1,2 calcite and dolomite. 4 Siliceous sand and 15 minutes (UP~ 1 gravel, 90% or more 73 20 minutes ~PO 1

3!l&rtz,

chert or 1 hour ( P) 1 Int. (UP) Unpluttnd (PO) Plutere4 OD ODe IIide (PP) Plutere4 on both -'del

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flint. (UP) Uop!utered (PO) ... ered GO ODe IIde (PP) ... ered GO both eIda

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Type of Con8truction GYPSUM BLOCK Type of Cooatruction NON-BEARING COMPOSITION BLOCK PARTITIONS Wall

Th~

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(in.) 2 3

"

5 Wall Thickness (in.) 2 3

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TABLE 17 Fire Endurance of Non-Bearing Gypsum Block Partitions. Minimum Percen~ of Ref. Remarb Solid Material in nit8 Endurance (page 5) 100 (solid) 1 hour (UP) 1,2 MortarMb:

I

1 hour ~UP) 1,2 1:3 sanded gypIum 70 (hollow) 2 hours PP) 1,2 Plutet 70 (hollow)

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3 houn (PP) 1,2 ~ inch of 1:3 .nded gypaum 100 (solid)

I

"houn ~UP) 1,2 6 houn PP) 1,2 TABLE 18 Fire Endurance of Non-Bearing Composition Block Partitiooa Minimum Percentap of Solid Material in Unita 100 100 Endurance ₁ hour (PP) 2 boun (PP) Ref. (page 5) 1,2 1,2 Remarb Blocb-The blocb were made of ahredded wood fiber (exceJ.ior) bonded with magnesium-o:r.yaulfate cement. Mortal' Mls-portJand cement lime. Pluter--l:3 anded lYPIIum.

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