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Stairways serving bulkhead enclosures not part of the required building egress providing access from the outside grade level to the basement shall be exempt from the requirements of 780 CMR 53 1143 and 53115 where the maximum height from the basement finished floor level to grade adjacent to the stairway does not exceed eight feet 2438 mm and the grade level opening to the stairway is.
Basement stairs not to code. When finishing a basement be sure the stairs leading to it from the main floor meet building codes and do not pose a safety hazard. The treads are currently 9 14 deep with a rise of 7. AS 1657 444 Straight flights.
Existing stairways may need to be modified with new solid risers or toe board with possibly new replacement treads having nosings when solid risers are provided with new graspable handrails andor with new intermediate balusters for open stair guards to meet current code. Common examples of when its OK for you staircase not to meet building code requirements. If it is you may need to find a way to create a new or alternate means of egress in order to replace the stair.
Including cutting an egress window. The new basement staircase is 5 treads down and then your on a landing and then another 5 treads down to get to the basement floor for a total of 11 steps. This should be no more than 7 34 inches.
The top 5 steps will be to code however the bottom 5 steps get squeezed to 325 because the foundation is thicker than the stud wall. I bought the steel stringers and treadsall that is fine. In order to meet code they need to be 10.
You can also push the header at the top of the stairs back. If the floor to floor is less than 570mm all that is required is a zero tread. If this was the only set of stairs leading to the basement and therefore the only means of access it would be required to meet building code.
Code below requires minimum 36-inch width above handrail and below headroom height. From description all is well. R31171 Width Stairways shall be not less than 36 inches 914 mm in clear width at all points above the permitted handrail height and below the required headroom height.
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