Stair calculator

(1)

Publisher’s version / Version de l'éditeur:

Building Practice Note, 1984-07-01

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Stair calculator

Strelka, C. S.

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3

ISSN

0701-5216

w-

DO-

. 0 l

I

STAIR

CALCULATOR

~ i v i s f o n

of

hl-Lldtng

Research,

Narional Research

Council

of

Canada

(3)

NATIONAL

RESEARCH

COUfrlCIL

QF

CANADA

DXVZ'SION

'OF

BU

ILDlEtG

RESBARW.

STAIR

CALCULATOR

by

C.S.

S t r e l k a

Otrt

awa

(4)

I n

t h e planning

of

bufldings

and in s i t e development

Lhe

designer

encounters

a

number

of

problems concerning

the

movement

of

people

and goods

from

one

Level

to

another.

To

do

t h i s

either

mechanical

means

(elevators,

escalators)

ar

s t a t f c

butlding

elmeats

( s t a i r s ,

r-s,

ladders) m u s t

be

used.

Both

a£

these

groups

are

important

to proper

design

for

the comfort

and safety

of

the

user.

This

N o t e

concentrates on the

design

o f

the

s t a i r s

o n l y .

The

attached

"Metric

S t a i r

Calculator", when

assembled

according

to

the instructians

g i v e n

on

t h e sheet,

car1

be

used

for f

asc

calculations of t h e number

and

height

of

risers

for

a given floor-to-floor difference in elevation.

A l l

d3rnensi~na

are given in millimetres.

Far

quick

referenee

the

foliowing

are the

minimum

arid

maximum

dimensions

of

various

s t a i r

d e s i g n

elemen~s

accordtng

to

the

National

(5)

STAIR

DESIGN

LIMITS

INDIVIDUAL DWELLLNG.

MAX.

MIN.

N B C 8 5

mm

m m

Clause

P U B L I C U S E

MAX.

MIN.

N B C 8 5

m m

mm

Q

ause

Exterior

S t a i r

Ri

sar

200 -

9.8.3.1 Exrerior

S t a i r

Riser

200

125 9 . 8 . 3 . 2

Run

-

210 Run

3 5 5

2

30 Tread

Tr

e

ad

w i d t h

-

235 width

-

250 I n t e r i o r

Stair

Ueer

20 0

-

9.8.3.1 Interior Stair

W e e r

200

125

9.8.3.2 i

exeep

t

r

tl

Ru

n

-

2

10 RU

d

355 2 30

service

rooms)

Tread

width

-

2 35

width

-

2 SO

Nosing

or

When

r u n

2 ₅

_9.8.3.3

_Nosing

_{o r}

_When

_{r u n}

₂

5 _{9 . 8 . 3 . 3}

backslope

'Lees than

-

backslope

LESS

than

-

250 mm

Landing

Two

equal

t o

9.8,C.l

Landing

Twa

equal

to

9.8.4.1 f l i g h t s

-

atair

flights

stair

width

w l d t h

Straight

tun

-

1100

9.8.4.1 run

-

1 lQO

Landing

to

3700

-

9 . 8 . 4 . 5

_Landing

_{t o}

₃₇₀₀

-

L

andlng

l a n d i n g

height

h e i g h t

d

i f

Eerence

d i f f e r e n c e

Headroom

S t a i r s

-

1950

**9*8.3.6**

Headroom

St a i r s

-

2850

9 . 8 . 3 . 6

/vertically over

/vertically

l i n e drawn through

Landing

-

1950

9.8.4.6 _{o v e r l i n e}

_Landing

-

₂₀₅₀

_9.8.4.6

edge

o f

nosings/

drawn

through

edge

of

nosings/

Handrail

S t

a i r s

9 20

800 9 . 8 . 7 . 7

Handrail

to

be

S t

airs

9

20 900 9.8.8.4

extended

min.

Landing

-

900

4.8.8.5

300 m m beyond Landing

-

1070

9 . 8 . 8 . 4

t h e top

and

bottom

pf

(6)

METRIC STAlR CALCULATOR

HOW T O ASSEMBLE THE CALCULATOR

1)

CUT

WT AIL

F O U R

PARTS OF CALCUUTQR PRINTED ON THIS SHEET ALONG THE T H I N BORDER LINES 2) PARTS 1. 3, 4 TO A

THIN

SHEET OF CACARDBQARV, CUT ALONG THE BORDER UNE5, CUT WT THE

OPWINGS ON PARTS 3 AND 4

3) PASTE PART 2 TO THE OTHER SIDE OF CARDBOARD WlTH PART 1 ATTACHED

.a) PREPARE CURSOR PARTS 3 & 4 USING STRIPS OF CAROBOARD AT TOP AND BOTTOM A5 SPACERS

HOW TO USE THE C A L C U L A T O R

1) SET VISOR QVUt GIVEN "FLOOR40-FLQOR" HEIGHT

2) FOR GIVEN NO. OF RISERS tN STAIR FLIGHT READ RISER HEIGHT AT THE R I G H T EDGE OF CURSOR

1 TOP TO FMOR

-

23 24

as

3 NO. OF RISERS. FLOOR T CI FLOOR m f l , 12

.

12, 14 IS l6 8 17 18. 19 '20