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Old 10-08-2007, 02:15 PM
 
1 posts, read 12,412 times
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Just needed to know the min. and max. of residental stair risers.
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Old 10-09-2007, 08:16 AM
 
Location: Central Connecticut
178 posts, read 572,614 times
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Here's the applicable section from the State Building Code, but you should double-check with your town building inspector for confirmation:


(Amd) 1009.3 Stair treads and risers. Stair riser heights shall be 7 inches maximum and 4 inches minimum. Stair tread depths shall be 11 inches minimum. The riser height shall be measured vertically between the leading edges of adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at right angle to the tread’s leading edge. The greatest tread depth within any flight of stairs shall not exceed the smallest by 3/8 inch.

Exceptions:
1. Circular stairways in accordance with Section 1009.7.
2. Spiral stairways in accordance with Section 1009.9.
3. Aisle stairs in assembly seating areas where the stair pitch or slope is set, for sightline reasons, by the slope of the adjacent seating area in accordance with Section 1024.11.2.
4. In occupancies in Group R-1 bed and breakfast establishments, in occupancies in Group R-3, as applicable in Section 101.2, within dwelling units in occupancies in Group R-2 and in occupancies in Group U, which are accessory to an occupancy in Group R-3, as applicable in Section 101.2, the maximum riser height shall be 8 ¼ inches and the minimum tread depth shall be 9 inches. A nosing not less than ¾ inch 34 but not more than 1 ¼ inches shall be provided on stairways with solid risers where the tread depth is less than 11 inches.
5. The riser height and tread depth of existing stairways in buildings undergoing addition, alteration, repair, relocation or change of occupancy that involve the existing stairways shall be permitted to remain, provided the greatest riser height within any flight of stairs shall not exceed the smallest by 3/8 inch and the greatest tread depth within any flight of stairs shall not exceed the smallest by 3/8 inch.
6. Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.


Hope this helps
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