Section 504.3 covers the current ADA Standards for open risers on stairways.
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Open Risers: ADA Standard Section 504.3
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OPEN RISER
[DSA-AC] The space between two adjacent stair treads not closed by a riser....
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11B-504.3 Open risers
Open risers are not permitted. Exceptions: On exterior stairways, an opening of not more than ½ inch (12.7 mm) may be permitted between the base of the riser and the tread....
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R408.3 Open Risers
R408.3 Open Risers. Open risers are not permitted....
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OPEN RISER
OPEN RISER. The space between two adjacent stair treads not closed by a riser....
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504.3 Open Risers
504.3 Open Risers. Open risers are not permitted....
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504.3 Open Risers
Open risers are not permitted....
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504.3 Open Risers
Open risers are not permitted....
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OPEN RISER
The space between two adjacent stair treads not closed by a riser....
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OPEN RISER
The space between two adjacent stair treads not closed by a riser....
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4.9.2 TREADS AND RISERS
On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths....
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11B-504.3 Open risers
Open risers are not permitted. Exceptions: On exterior stairways, an opening of not more than ½ inch (12.7 mm) may be permitted between the base of the riser and the tread....
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11B-504.3 Open risers
Open risers are not permitted. Exceptions: 1. ...
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11B-504.3 Open risers
Open risers are not permitted. Exceptions: 1. ...
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4.9.2 Treads and Risers
On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths....
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RISER
[DSA-AC] The upright part between two adjacent stair treads, between either an upper or lower landing and an adjacent stair tread, or between two adjacent landings.
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Treads and Risers: ADA Standard Section 504.2
Section 504.2 covers the current ADA Standards for the treads and risers on stairways.
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RISER
RISER. The upright part between two adjacent stairs treads....
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1.14 Riser
1.14 "Riser" shall mean and refer to an elevated tier (usually six to eighteen inches) in an auditorium on which seats are affixed to the auditorium floor....
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11B-504.2 Treads and risers
All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (102 mm) high minimum and 7 inches (178 mm) high maximum....
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Pool Stairs: ADA Standard Section 1009.6.1
EXCEPTION: Pool step riser heights shall not be required to be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum provided that riser heights are uniform....
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11B-1009.6.1 Pool stairs
Exception: Pool step riser heights shall not be required to be 4 inches (102 mm) high minimum and 7 inches (178 mm) high maximum provided that riser heights are uniform....
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Treads & Risers
...do the stairs have closed risers so a crutch or cane cannot slip through the open space between the stair risers and people will not lose their balance as they climb the stairs?...
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1011.5 Stair treads and risers
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