Report on an Investigation of a Full-Scale Wall Panel Insulated with an Alfol Improved Blanket Insulation

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Report on an Investigation of a Full-Scale Wall Panel Insulated with an

Alfol Improved Blanket Insulation

I---

NATIONAL RESEARCH COTJNCIL

.

I

I

I

CANADA

I

DIVISION OF B U I L D I N G RESEARCH R e p o r t

on an

I n v e s t i g a t i o n of a F u l l - s c a l e Wall P a n e l I n s u l a t e d w i t h a n A l f o l Improved B l a n k e t I n s u l a t i o n

by

G , 0. Handegord and D , G. Cole ( P r a i r 3 . e R e g i o n a l S t a t i o n

of

t h e D i v i s i o n o f B u i l d i n g ~ e s e a r c h )

REPORT G\J _{AN INVESTIGATlON}

OF

_{A P ' I U SCALE IiALL PAEEL}

INSTILA

TED

_{'I: 1'TH AN ALFOL UIPROVED BULNKET 1TLSUL.TIOM}

G.O. _{Handegord and D.G. Cole}

Introduction

----

A previous r e p o r t ( 1 ) on thermal t e s t s of Alfol Type I1 h p r o v e d Blanket i n s u l a t i o n was prepared in November, 1951. This i n s u l a t i o n was developed by

Al~minum Insulation Limited i n an attempt t o overcome c e ~ . t a i n undesirable f e a t u r e s of Alfol h s l ~ l a t i o n s previously on t h e market. Subsequent t o t h e s e t e s t s t h e design of t h i s improved blanket was chanced s l i g h t l y t o f a c i l i t a t e manufacturing. Samples of t h i s final blanket design were submitted t o t h e Division of Building Research

i n

August, 1953, f o r similar t e s t s t o those con- ducted

i n

1951. This r e p o r t d e a l s w i t h t h e r e s u l t s of t e s t s conducted i n t h e s t e a d y s t a t e w a l l panel t e s t apparatus during t h e period October, 1953 t o February, 1954.

Description of Test Panel

A f u l l s c a l e t e s t panel, e i g h t f e e t i n height and f i v e standard s t u d spaces wide, was employed. The panel consisted of

6-

x

1-inch bevel cedar s i d i n g , Scutan "mediumtt sheathing paper, 10- by 1-inch spruce s h i p l a p sheath- ing, 2- by &-inch studding, and 3/8-inch plasterboard i n t e r i o r f i n i s h . Sheath- ing and s i d i n g were secured ~ & t h 1%-inch wood screws and t h e s i d i n g painted with one prime c o a t 2nd two i l n i s h coats of white e x t e r i o r house paint. The

Alfol b l a n k e t i n s u l a t i o n was i n s t a l l e d

i n

t h e c e n t e r t h r e e stud spaces i n accordance with t h e manu.facturer's d i r e c t i o n s a n d t h e i n t e r i o r plasterboard secured with 3/4-inch f i O wood screws. The o u t e r two s t u d spaces were insu-

l a t e d with 4-inch mineral wool i n s u l a t i o n and covered w i t h tempered hardboard a s a n i n t e r i o r and e x t e r i o r f i n i s h . A 1- by 3-inch edge s t r i p w a s fastened

around t h e perimeter of t h e panel with wood screws i n t o t h e edge framiny mem- bers, t o b e a r a g a i n s t a rubber g a s k e t surrounding t h e t e s t opening. The space between t h e pael and surrounding t e s t opening was packed with wood-fiber

i n s u l a t i o n .

Some d i f f i c u l t y was experienced i n expanding t h e A l f o l b l a n k e t due t o excess clue from one of t h e j o i n t s causing the i n t e r i o r c u r t a i n t o s t i c k t o t h e folded flanpe. Figure 1 i l l u s t r a t e s a _{s e c t i o n through t h e blanket showing}

t h i s f o l d

i n

d e t a i l . Figure l a r e p r e s e n t s a s e c t i o n through t h e blanket before expansion, $igure l b i l l u s t r a t e s t h e blanket expanded and Figure l c shows a s e c t i o n throuzh t h e blanket when t h e expansion was hindered by t h e f a u l t y glue l i n e . The sur2aces noted a s 1 and 2 i n Figure l a were those stuck t o g e t h e r by t h e a c c i d e n t a l spread of glue from t h e j o i n t between t h e i n t e r i o r c u r t a i n and t h e n a i l i n g flange. This f a u l t occurred over a l e n g t h of 2 t o

3

inches every

1 4

t o 1 8 inches along t h e l e n g t h of t h e blanket. A

f i v e f o o t , $-inch diameter moden dowel w i t h a rounded p o i n t was s u c c e s s f u l l y

used t o s e p a r a t e t h e c u r t a i n a t these points.

The expanded blanket r~~easured 14-9/16 inches in width, and some buckling took place on i n s t a l l a t i o n i n t h e test panel s i n c e t h e space between t h e s t u d - ding v a r i e d from

1 k i

t o I)& inches. For t h i s reason

it

may have been p o s s i b l e t h a t t h e c e n t e r f o i l c u r t a i n touched t h e e x t e r i o r o r i n t e r i o r c u r t a i n a t some points. The approximate l o c a t i o n of the f o i l c u r t a i n s i n t h e

t e s t

panel a r e sho-rm i n t h e v e r t i c a l s e c t i o n of r'igure 2 and the h o r i z o n t a l s e c t i o n of Figure

3.

A view of t h e i n s u l a t i o n as i n s t a l l e d from t h e warm s i d e i s given i n Figure

k,

and from the cold s i d e in lxgure

5.

The b l a n k e t was f ~ ~ l l y expanded before i n s t a l l a t i o n i n the w a l l and care- f u l l y folded a t t h e t o p and bottom t o conform a s c l o s e l y a s p o s s i b l e t o t h e s u r f a c e of t h e upper and lower p l a t e f o r i t s f u l l thickness. The i n s t a l l a t i o n

of t h e U f o l blanket was n o t a s simple as f o r t h e standard 2-inch b a t t i n s u l a - t i o n and vmuld no doubt involve considerably more c a r e where s t u d spacinig vms n o t q u i t e standard.

Test Procedure

-

The i n i t i a l t e s t of the panel was conducted with a temperature of -30'~. on t h e cold s i d e a.nd with air conditions of 70'~. and 30%

2.E.

on t h e v m side. Due t o high anbient temperatures i n t h e l a b o r a t o r y it was found impossible t o maintain warm s i d e a i r t e m ~ e r z t u r e s below

74'~.

and a s a r e s u l t f o u r subsequent t e s t s were c a r r i e d out with a warm s i d e temperature of

75'~.

and 2 8 5 % h.

I?.

These t e s t s were c a r r i e d ol7.t dilring t h e months of October t o December,

1953,

with forced c i r c u l a t i o n of a i r a t a v e l o c i t y of approximately 150 fpm. over

t h e warm s i d e of t h e panel,

A t t h e end of appro:~imatel.y two months t h e i n t e r i o r plczsterboard was

removed and t h e i n t e r i o r s u r f a c e of t h e i n s u l a t i o n was exanined f o r con3ensation.

A second s e r i e s of t e s t s were then conducted with g r a v i t y a i r c i r c u l a t i o n over t h e

warm

s i d e of t h e panel mith no hunlidity c o n t r o l , t h e r e l a t i v e humidity on t h e warm s i d e beinc of t h e order of

15%

a t 7 0 ' ~ .

Each t e s t conducted on t h e panel involved extensive temperature measure

-

ments taken twice during the period of t e s t . hleasurements were a l s o made of

t h e r a t e of h e a t flow i n t o t h e panel a t t e n d i f f e r e n t v e r t i c a l l o c a t i o n s a t

1 p o i n t s mid-way betvieen studding and d i r e c t l y over t h e studdinc,

us in^

two -:-!I

by &inch h e a t meters. Yne h e a t meter e.m.f. a t each l o c a t i o n was recorded i'or a period of

3

t.o 1 hour and t h e near1 v d u e calc-;I.~lkc:.

!

:

I

c c t r o n i c p o t e n t i o -

6Jefe

meters a - e _{used t o meas1:re both temperatures a d h e a t n e t e r millivoitagc;.s,} temperatures bein? measured t o an accurn.cv o f 0.2'~. A h a i r typ h y p o n e t e r was used t o record humidities i n t h e warm _{room and t h i s record was checked}

using an electronic: dew p o i n t hygrori~ t e r .

Test Results

---

The r e s v - l t s of two representatjive t e s t s a r e ~ r e s e n t e d i n Figs.

6

and

7

f o r an i n s i d e t o o u t s i d e a i r temperature d i f f e r e n c e o f approxixi t e l y 100~3'. Zigure 6 shoivs t h e v e r t i c a l v a r i a t i o n s in ternperatwe a t d i f f e r e n t planes in t h e w a l l and the correspond in^ r a t e s of heat f l o v i n t o t h e wall ~ v i t h forced

c i r c i d a t i o n of a i r o - ~ e r t h e warn s i d e . Firilre 7 shor.rs a s i n i l a r s e t o. d a t a f o r t h e same p m e l ? V K . L ~ ~ ;:ravity c i r c u l a t i o n of a i r over the w a r n side. in both i'igures t h e fol1o:yin.r n m 3 e r system l o r temper?ture curves has beell ernploz~ed:

Curve 30. 1 ';Jam s i d e air one inch from p.ulel surface.

Curve No. 2 Inside s u r f a c ? of ulasterhoard

-

c e n t e r of c e n t e r s t u d space. Curve No.

h

i n s i d e surface o f plasterboard

-

c e n t e r oi' s t u d t o r i g h t of

c e n t e r s t u d space.

Curve No.

5

A i r space 3/3-inch from

sheath in^.

Curve No. 6 Inside s u r f a c e of sheathing.

Curve TJo. 7 Cold room a i r 2-inches from s u r f a c e .

The i n t e r i o r plastel-bozi-d was removed a f t e r t-uo months of operation vrith 7 5 ' ~ . and 28% R.11. on t h e w a r m s i d e and -30O~. on t h e cold s i d e . Condensation of moisture had occurred on t h e i n t e r i o r s u r f a c e of the blanket from t h e bottom of t h e w a l l up t o a height of about

4

f e e t . Small puddles of w a t e r had accumu- l a t e d on t h e f o i l covering t h e t o p of the lower p l a t e . Photographs taken a t t h e time a r e s h o ~ m in Fi,wes

9

and 10, and t h e condensation on t h e f o i l may be seen on close exmination.

The i n t e r i o r plasterboard was r e i n s t a l l e d follovring t h i s exarnina-Lion and t h e panel was t e s t e d with g r a v i t y a i r c i r c u l a t i o n i n t h e -trar?r. room f o r a period of two months. P r ~ r m s i d e humidities were n o t c o n t r o l l e d durinq t h i s period and f l u c t u a t e d ~ ~ 5 t h ambient conditions i n the rang2 frosa 1 0

-

15%.

The cold roorn a i r temperatures were t o be c o n t r o l l e d a t -30O~. b u t a t one time f e l l t o -36O~. f o r a period of about a week, due t o f a i l u r e of t h e reheating control. A t the

end of t h i s two month period t h e i n t e r i o r plasterboard was again removed and t h e i n s u l a t i o n taken from t h e w a l l .

Some s l i g h t condensation had formed on t h e i n n e r face of t h e blanket on an a r e a extending approximately 6-inches f r o n t h e lower p l a t e , Considerable f r o s t had accumulated on the i n t e r i o r s u r f a c e of t h e sheathin3 a s shorn i n t h e photoyraphs of Fisures 11 and 12. This f r o s t w a s h e a v i e s t near t h e t o p of t h e s t u d s ~ ~ a c e and was $-inch t h i c k i n p l a c e s in

th,

0 c e n t e r s t u d slsnce and > s rmch

a s l-inch t h i c k in the l e f t hand s t u d space. The e x t e r i o r s u r f a c r of t h e B l f o l b l a n k e t showed f r o s t accumulation i n patches p a r t i c u l a r l y near t h e bottom, as

shown in f i g u r e s

13

and

14.

S m l l e r patches occurred a t mid-hei,.;ht a s in Figure 15, and a l s o near t h e t o p of t h e wall,

Some i c e had formed on t h e i n t e r i o r surface

raft

paner backing) of %he outs5de f o i l c u r t a i n , p n r t i c u l a r l y n e a r the bottom. Most of t h i s i c e froin t h e c e n t e r and l e f t hand s t u d spaces was c o l l e c t e d . Approximately 170 grams was found in t h e l e f t hand s t u d space and about

90

grams in t h e c e n t e r s t u d space.

Discussion of Test Results

_-

-

_--

_--

_-.

The d a t a shown i n Figure

6

may be co~npared, allovri-% f o r d i f f e r e n c e s i n cold roon temperature, t o t h e r e s u l t s of t e s t s reported in t h e DBR Report

Rs

f o r the nrevious A l f o l Blanket and t o the r e s u l t s shown in t h i s previous r e p o r t f o r 2" b a t t i n s u l a t i o n . The w a l l i n s u l a t e d with t h e new A l f o l Blanket exhibited v e r t i c a l v a r i a t i o n s in t e m p e r a t u ~ e and h e a t flow s i m i l a r t o t h o s e f o r t h e

previous Alfol wall, although s u r f a c e t e m p e ~ z t u r e s wers g e n e r a l l y higher a t t h e bottom of t h e w a l l and t h e r a t e of h e a t flow i n t o the m a l l was l e s s a t any given height. This may be a t t r i b u t e d t o t h e a d d i t i o n a l i n s u l a t i o n afforded by t h e e x t r a r e f l e c t i v e air space.

v a r i a t i o n s with h e i g h t a r e reproduced

i n

Table I, t o g e t h e r with s i m i l a r d a t a obtained in t h e p r e s e n t study. The r e s u l t s of a t e s t conducted on t h e same

test

p m e l i n s u l a t e d with a 2-inch t h i c k , m p e r enclosed, g l a s s f i b e r blanket

i n s u l a t i o n , i n s t a l l e d immediately beneath t h e p l a s t e r , a r e a l s o included in t h i s t a b l e . This blanket i n s u l a t i o n was t e s t e d with ~ r a ~ r i t y a i r c i r c u l a t i o n over t h e marm s i d e of the an el and t h e results on a t y p i c a l t e s t a r e presented g r a p h i c a l l y

in

Figure

8.

The r e s u l t s shown i n Figure 8 may be d i r e c t l y compared with those shorn f o r t h e A l f o l b l m k e t i n Figure 7. Some question may be r a i s e d

as

t o t h e p o s s i b l e e r r o r involved in comparing h e a t meter readings taken on b a s i c a l l y d i f f e r e n t -nail constructions (i.2. a i r space beneath p l a s t e r vs. no a i r space beneath p l a s t e r ) , b u t such e r r o r i s assuned t o be small.

In

Table I apparent transmittance v a l u e s have been c a l c u l a t e d by d i v i d i n g h e a t f l m r a t e s a t d i f f e r e n t heights by the average i n s i d e t o o u t s i d e a i r tempera- t u r e d i f f e r e n c e , and multiplying by a f a c t o r o f 1.25 (1).

Comparison of Figures

6

and 7 i l l u s t r a t e s t h e e f f e c t of a i r c i r c u l a t i o n on t h e

warm

s i d e of t h e panel. The g r e g t e r v e r t i c a l v a r i a t i o n

i n warm

s i d e a i r temperature r e s u l t e d i n lower surface temperature n e a r t h e bottom of t h e w a l l and higher h e a t f l o ~ i r a t e s i n t o t h i s region. The d i f f e r e n c e i n average h e a t flow i n t o t h e w a l l f o r t h e two c a s e s was v e r y s l i g h t . I f

it

i s assumed t h a t t h e r e t e of h e a t f l o w i n t o t h e studding occurred aver

15%

of the w a l l area,

t h e approximate o v e r a l l I1Ult v a l u e f o r t h e A l f o l i n s u l a t e d w a l l may be c a l c u l a t e d as f o l l o m :

( a ) With forced c i r c u l a t i o n

in

t h e

warm

roan,

"UI1 ( o v e r a l l )

=

(0.85

x

0.079) + (0.15

x

0.141)

=

0.088 btu/sq.ft./hr.'r'. ( b ) With g r a v i t y c i r c u l a t i o n in t h e warn1 roorn,

=

0.087 b t u / s q . f t . / h r a O ~ .

Ln t h e DBR Report

RS

t h e o v e r a l l "U" value of a d l i n s u l a t e d with A l f o l Type 11 Improved Blanket mas estimated, on t h e same b a s i s , a,t 0.107 btu/sq.ft./hr,O~. The u r e s m t Alfol Blanket, t h e r e f o r e , provides a marked decrease i n o v e r a l l llU1l

value, due t o t h e a d d i t i o n a l r e f l e c t i v e a i r spaces created.

The condensation of moisture on t h e i n t e r i o r f o i l c u r t a i n would be expected t o reduce i t s i n s u l a t i o n value, a s would t h e condensation on the o u t s i d e of t h e o u t e r f o i l . Using t h e value l i s t e d i n t h e A.S.H.V.E. Guide of 0.46 f o r the con- ductance of an a i r s&pace bounded by aluminum f o i l , t h e

total

r e s i s t a n c e of t h e p o r t i o n of a wall between s t u d s i n s u l a t e d with the present Alfol blanket may be calcula.ted. I f the f o i l s u r f a c e i n one of these a i r spaces w a s covered completely with water, t h e o v e r a l l r e s i s t a n c e would be reduced by approximately

lo%,

and

i f two 01 the s p c e s were so a f f e c t e d t h e o v e r a l l r e s i s t a n c e m u l d be reduced about 22%.

Some increase

i n

t h e h e a t flow i n t o the w a l l with time was noted during t h e s e r i e s of t e s t s with forced c i r c u l a t i o n i n the warm room, but t h e increase during t h i s two month period only amounted t o about

5%.

It may be, however, t h a t t h e condensation had occurred before t h e f i r s t measurements were made and t h e subsequent increase was due only t o a s l i g h t increase i n t h e a r e a and thickness of t h e condensation.

The performance of the w a l l i n s u l a t e d with t h e new A l f o l Blanket was s l i y h t l y b e t t e r than t h e %dl in s u l a t e d w'th t h e 2-inch g l a s s f i b e r blanket as f a r a s o v e r a l l

"U"

value

i s

concerned. The v a r i a t i o n in surface temperature with h e i g h t was n o t as g r e a t f o r t h e w a l l w i t h t h e g l a s s f i b e r i n s u l a t i o n and

surface t e r n p e r ~ t u r e s a t t h e bottom of t h e w a l l were

7

t o

8'

higher.

The r e l a t i v e horizont,?l surface temper*lture v a r i a t i o n exhibited by various walls a r e l i s t e d in Table 11, i n which some of t h e r e s u l t s given i n t h e previous

r e p o r t a r e reproduced. Comparisons made between t h e r e s u l t s of t h e previous study and t h e present one may be influenced by t h e f a c t t k t standard grade 2-

x

&-inch f r a d n g was used i n t h e 1951 t e s t s , and a c c u r a t e l y f i n i s h e d c l e a r f i r studding was used i n t h e 1953-54 t e s t s ,

A d i r e c t cornparison may be m d e betvreen t h e r e s u l t s f o r t h e w a l l i n s u l a t e d with t h e modified A l f o l blanket and t h e vra3.1 i n s u l a t e d with 2-inch g l a s s f i b e r blanket. The A l f o l i n s u l a t e d w a l l exhibited s l i g h t l y g r e a t e r d i f f e r e n c e s i n temperature betvreen a r e a s over t h e s t u d and s t u d space, b u t f o r both w a l l s t h e d i f f e r e n c e s would be l a r g e enough t o cause dust marking (2)-

Condensation Within t h e Panel

The f a c t t h a t condensation occurred between t h e middle and o u t e r f o i l c u r t a i n suggests t h a t t h e aluminum f o i l does n o t provide a p e r f e c t vapour b a r r i e r , It i s l i k e l y t h a t t h e middle c u r t a i n , because

it

i s crumpled, may contain p i n holas as noted i n t h e previous report. The presence of p i n holes in t h e f o i l on t h e o t h e r c u r t a i n s might occur in t h e manufacturing process, The e x t e n t of t h e condensation found on t h e sheathing would suggest t h a t extreme c a r e must be taken in s e a l i n g lapped j o i n t s of t h e vapour b a r r i e r t o prevent vapour from passing through. It i s l i k e l y t h a t more care was taken in c o n s t r ~ ~ c t i n g t h e t e s t panel than t h e r e would be i n p r a c t i c e , and g r e a t e r leakage of vapour t o t h e i n t e r i o r of the w a l l might be expected in a c t u a l s t r u c t u r e s under t h e same conditions. The conditions of t e s t were v e r y severe, however, f o r

it

i s u n l i k e l y t h a t outside temperatures of

- 3 0 O ~ .

w i l l p r e v a i l f o r a s long a period a s four months i n a c t u a l p r a c t i c e .

Conclusions

-

improved A l f o l blanket w a s 0.088 b t u / f t . 2 h r e 0 F.

2. _{The o v e r a l l transmittance o f t h e A l f o l i n s u l a t e d w a l l was equal. t o o r} s l i g h t l y lower

than

t h a t f o r

a

w a l l in which nominal 2-inch t h i c k glass f i b e r blanket i n s u l a t i o n was i n s t a l l e d immediately beneath the plasterboard,

3.

Temper:?ture dj_fi'erencss between s w f a c e s over the s t u d and s t u d spsce were l a r g e enough t o p r e s e n t a tendency toward d u s t markin:, but, were n o t much g r e a t e r than those exhibited by t h e g l a s s f i b e r blanket i n s u l a t e d w n l l .

I ! .

Condensation between the f o i l c u r t e i n s of t h e A l f o l i n s u l a t i o n suggests t h a t

t h e f o i l does not provide a p e r f e c t va.pour b a r r i e r .

5.

The A l f o l i n s u l a t e d w a l l exhibited a lovrering of surface temperature near t h e bottom which would have r e s u l t e d in s u r f a c e condensation under the t e s t conditions a t humidities in excess of

51%

a t 7 0 ~ 5 .

(1) Report on an I n v e s t i g a t i o n of a F u l l Scale vial1 Panel Insnlated with A l f o l T'ype

I1

Improved Blanket. G o o . Handegord. EBli Iieport

25,

1951.

( 2 ) Design of Insulated Buildings f o r Various Climates. ToSo Hogers. Roberts P r i n t i n g Co. 1951.

TABLE I

Apparent

Thermal

Transmittance Values f o r Vialls

Insulation

Apparent Transmittance dtu/f t 2 / h r / ' ~ . Distance from bottom of w a l l i n inches,

6 18 30

-_

42

54

66 78 90 Av 2-inch mineral wool b a t t next t o

pla.sterboard (center of s t u d space) 104 a084 .076 .075 .079 ,c83 .076 .075 0.077 2-inch mineral wool b a t t next t o

sheathing (center of stud space) 102 .I60

.I11

.lo2 .091 ,083 .O8O .077 ,068 0.097 Alfol Type

I1

Improved Blanket 89.5 1

.115

.099 .O85 .077 -070

.064

.063

0.091

(center of stud space) 111

.I-_Slt

.1111 .097 ,068

,081

.074 .068 .062 0 . ~ 9 2 Alfol Type

I1

Improved Blanket 89.5 .278 .219 1 .176 1 .I73 .I76 1 0.195

(center of stud ) 111 -270 .210 .186

,175

.I31 ,169

,171

.169 0.190

1

Fkdified Alfol Improved Blanket+; 1--I

(center of s t u d space) _{.039 .056}

_.061

_{,070 ,081 .093 ,099}

_.131

_0.079 0 I

!!godif ied Alf 01 l i n ~ r o v e i 3lanket++ (center of s t u d )

Podified f l f 01 Improved Blmket*; (center of stud space)

Uodified Alfol Improved Blanket+%- (center of stud )

2-inch g l a s s f i b e r blanket next t o

plasterboard (center of stud space) 100 ,060 .094 ,086

.071

.079 -081 .081 .@80 0,081 2-inch g l a s s f i b e r blanket next t o

plasterboard (center of s t u d ) 100

.I51

.1G3

1 2 4 a 2 8 2 -121 1 3 0.133

*

Forced convection on warm side. Average of f i v e

tests.

Temperature Difference 9etween Surfaces of Stud Space and Over Studdint f o r Various 7ialls

Temperature over Stud Space

minus

Inside t o Outside Ternpera- Temperature over Stud

-

OF. t u r e Difference

-

OF.

Saskatoon Tests (1951)

-.

Alfol Type

11

Improved Rla.nke

t

2 -inch Mlineral llrool

₍₁

₎ Batt a g a i n s t plasterboard (2)

2-inch Mineral 'Goo1 ( 1 Batt against sheathing (2)

Height

_-

8"

-

24" 4 0

-

-

72"

-

08"

-

A V O

Saskatoon Tests (1953-54)

-. -

?!odi f ied Alf 01 ₍₃

₁

_2.8

_3.8

_5.2 4.2

3.1

3.8 Im~roved Blanket (4

1

4.2

4 1

6.0 6.0 5.2

5.2

2-inch g l a s s f i b e r

blanket a z a i n s t nlasterboard ( 5 )

4.4

3.9 4.0 3.6 3.9 4.0

(1) Temperature a t c e n t e r of center s t u d space rlinus temperature on s t u d t o r i g h t of panel center-line.

( 2 ) Temperature a t c e n t e r of r i g h t s t u d space ~ ~ l i n u s temperature on s t u d t o r i g h t of panel center-line,

(3)

Forced circulatiorl over warm s i d e of p a e l . Average of f i v e t e s t s . ( 4 ) Gravity c i r c u l a t i o n over warm s i d e of panel. Average of t h r e e t e s t s . ( 5 ) Gravity c i r c i l l a t i o n over warn s i d e of panel. Average of two t e s t s .

TO ACCOMPANY

4

L)u,.u\

/

c H F c K.0

1

J P P r o v i v l o r n _{2 - 3 - 5 j l} I x A L E 3,'-

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TO ACCOMPANY

I

REPORT

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27

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