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Old 11-08-2013, 11:03 AM   #1
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Carpet consideration when building a straight staircase

I have a hypothetical question about carpet consideration when building a staircase that I cannot seem to figure out. I am going to demo the current basement staircase and relocate another one 180 degrees from a different opening. My question though, is do I take into account 3/4 in for padding and carpet when measuring and cutting my risers? So that if I were to estimate a final 7 1/2" rise after carpet install, then I should cut my risers to 8 1/4"? If I used a 7 1/2" riser height for initial cut, then after carpet/padding is installed wouldnt it give me a 6 3/4" rise?

This seems self-explanatory but I'm not really sure. Thanks


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Old 11-08-2013, 06:39 PM   #2
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Think about it for a minute. With any given riser, if you add 3/4" to the riser height by carpeting the upper tread, you are also decreasing 3/4" from the riser height due to the carpet on the tread below. The resultant riser dimension does not change. So, if you want a 7.5" riser after the carpet is installed, build the wood to the same 7.5".


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Old 11-08-2013, 07:06 PM   #3
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I agree with Arkitexas, the only two risers that would change would be the first at the bottom and the last one at the top. You would need to make the bottom riser and the top riser the thickness of the carpet and pad less. The only way all the risers would stay the same is if there was carpet on the bottom floor and the top floor.

Example of this would be to lay a piece of 3/4 board on each of the treads and see the difference in height first hand.

I always allowed a 1/2 inch for carpet and pad. Another thing is be aware of how slick carpet can be on stairs.
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