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Old 11-08-2012, 03:21 PM   #1
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Basement Stair Riser Height Variation w/ Subfloor

Hello Ė Iím in the earlier stages of planning a basement remodel and have a question about stair requirements. I plan on using Dricore subfloor (7/8 in) and then an engineered hardwood (3/8 in + underlayment). So Iím anticipated raising the existing floor roughly 1.5 inches.

If that is done the existing rise on the bottom stair will no longer be within 3/8 of an inch variation. The obvious solution is to re do the stairs, but Iím wondering if anyone has any alternate ideas.

Iíve read some posts where people propose spreading it out into multiple stairs by using spacers. However, when I read the code, it appears that the largest and smallest need to be within 3/8 of an inch of each other. Some posts indicate itís only 3/8 inch from the stair before.

Any other ideas? Thanks!


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Old 11-08-2012, 03:59 PM   #2
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code is typically for new construction. You're not constructing new stairs .....

I would call the building official and ask them what you have posted here, then you'll get the correct answer from the person that will be performing the inspection

make sense?

Good luck!



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Old 11-08-2012, 06:05 PM   #3
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Are the stairs being replaced with hardwood treads and risers, from existing pine board open riser stairs?

If they are, you will just work in the variance of height into your rise for the new stairs. If the existing are being left, you would just have a lesser height to/from the first tread.

Suggest doing a mock of the floor with some 3/4. ply to equal the new height, so you can see what it will look like.
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Old 11-08-2012, 06:50 PM   #4
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the variation shim blocks your talking about will only vary by about 1/8" from one tread to the next.. overall there can be a big differnce between top and bottom.. their making things work so you dont trip.. unless you want to build a whole new set of stairs
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