stairarchitecture

8/11/2019 stairarchitecture

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Architecture

Intro to Creating Stairways


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Terms for Stairs Handrail

30 high on slope

34 high on landings

Landings

Flat floor area connected to stairs


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Cast Concrete Stairs


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Terms of Stairs Baluster

Vertical member holding handrail

Tread

Horizontal parts of the steps

1 to 1.25 thick

10.5 to 11.5 deep


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Terms for Stairs Riser

Vertical parts of the steps

.75 thick

7 to 7 5/8 high

Nosing

Overhang of the tread

Approximately 1


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Terms for Stairs Stringer

Diagonal members, notched to hold risers

and treads

Min. of 2 needed

If over 3, then 3 is needed


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Terms for Stairs Headroom

Minimum distance from slope to ceiling is

66 minimum Total Rise

Floor to floor measurement

Total Run Distance from front of first step to end of

last (landing to landing)


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Types of Stairs Straight

L

Double L

U

Winder Spiral

Circular


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4 Rules to calculating stairs Slope must be 30-40 degrees

2 risers and 1 tread=close to 25

1 riser X 1 tread=close to 75

1 riser + 1 tread=close to 17


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Procedure in Planning Step 1 Determine the total rise (floor to floor)

Example:

Floor to ceiling 8

Ceiling

Ceiling joist 9

2ndfloor sub floor

2ndfloor, floor

Total rise= 107


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Procedures in Planning Step 2 Figure out NUMBER and SIZE of risers

Divide total rise by 7 (for starters)

Round this number to an exact # (15, 16)

Divide this # into total rise to get actualsize of risers


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Example Cont. 107 divided by 7=15.28

Round this number to 15 or 16

Divide 107 by 15=7.13

Divide 107 by 16=6.6

This is the actual size of the risers!!!!!


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Procedures in Planning Step 3 Figure out NUMBER and SIZE of tread

Use rule #2 to find size (around 10.5-11)

Recheck with rule 3 and 4

Always one less tread than riser

# of treads x tread size must equal total

run


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Things you have to calculate Total rise=

Total run=

Rise of step=

Run of step= (tread)(10.5-11.5)

# of risers=

# of treads= Angle of stairs=

Handrail height=


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Other Steps 4. Draw riser, tread grid pattern

5. Darken riser, tread and nosing

6. Draw stringer (usually 12)

7. Find rough opening (min 66)

8. Recheck Detail with balusters, handrails, etc.


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Other steps

810=106

106 divided by 7=15.14

Round down to 15

106 divided by 15=7.06 actual riser height

10.5 tread

15 risers 14 treads

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