stair construction & layout
TRANSCRIPT
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Stair Construction&
Layout
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Stairwell Opening
*The minimum stairwell opening width is 3 feet.
3'
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Tread length & Riser HeightAvoid any variation in tread length or riser height of more than 3/8th of an inch.
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Tread length & Riser Height*The UBC states that the minimum tread depth is 9 inches and the maximum riser height is 8 inches
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Stringer*A stringer is a usually a 2” x 12” board that is cut to form the risers and treads for the stairs.
*Stringers are made out of hard woods like birch, maple, and oak.
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Landings
Landings at the top and bottom of stairs should be at least equal in length to the width of the stairway.
If there is a landing in the middle of the stairs it should also be at least equal in length to the width of the stairway.
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Headroom Height
The minimum headroom height on a flight of stairs is 6'-8”.
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Riser
A note of DN 14R on your floor plan stairs means: Down 14 Risers.
A note of UP 14R on your floor plan stairs means: Up 14 Risers.
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Riser
If you have 13 treads in a stair unit there are 14 risers.
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Total LengthTo find the total length of the stairway simply multiply the tread length times the number or runs (treads).
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Residential HandrailsThe minimum height of a residential handrail is 34 inches. The maximum height is 38 inches.
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Residential GuardrailThe minimum height for a residential guardrail is 36 inches.
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Spiral Staircases*Most spiral staircases are made out of steel
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Gypsum Board
The UBC states that 5/8 inch type X gypsum board is required for enclosing all usable storage space under the stairs. The IRC states that the gypsum board must be 1/2 inches thick.