Stairs Flashcards
Stairways shall be not less than _____ in clear width at all points above the permitted handrail height and below the required headroom height.
36”
The clear width of stairways at and below the handrail height, including treads and landings, shall not be less than ______ where a handrail is installed on one side and _______ where handrails are installed on both sides.
31 1/2”
27”
The headroom in stairways shall be not less than ______ measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the landing or platform.
6’-8”
A flight of stairs shall not have a vertical rise larger than _____ between floor levels or landings.
151”
The riser height shall not be more than ______.
7 3/4”
The greatest riser height within any flight of stairs shall not exceed the smallest by more than ______.
3/8”
At open risers, openings greater than 30” above finished floor shall not permit the passage of a ____ diameter sphere.
4”
The tread depth shall not be less than _____.
10”
The greatest tread depth within any flight of stairs shall not exceed the smallest by more than ______.
3/8”
The walkline on winder stairs shall be located _____ from the inside of the turn.
12”
Winder treads should have a tread depth of of not less than _____.
6”
Stair nosing’s shall have a radius or curvature at the nosing not greater than _____ or a bevel not greater _____.
9/16”
1/2”
Stair nosing’s shall not project less than ____ or more than _____.
3/4”
1 1/4”
Handrails shall be provided on not less than one side of each flight of stairs with ____ or more risers.
4
The handrail height shall be between _____ and _____.
34”
38”
Handrails shall not project more than ____ on either side of the stairway.
4 1/2”
Handrails adjacent to a wall shall have a space of not less than ____ between the wall and handrail.
1 1/2”
Handrail ends shall be ______ or shall terminate in ______ or safety terminals.
returned
newel posts
Type 1 handrails with a circular cross section shall have an outside diameter of not less than ______ and not greater than _______.
1 1/2”
2”
Type 1 handrails. If the handrail is not circular, it shall have a perimeter of not less than _____ and not greater than _____ and a cross section of not more than _____.
4”
6 1/4”
2 1/4”
The clear width of spiral stairways at and below the handrails shall not be less than______ and the walkline radius shall not be greater than ______.
26”
24 1/2”
The headroom of spiral stairways shall not be less than _______.
6’-6”
The treads of spiral stairways shall be identical and the rise shall not be more than _____.
9 1/2”
Treads of spiral stairways shall not have a depth of less than _____.
6 3/4”
