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Old 02-24-2008, 01:32 PM   #1
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Hello all,
I need some help with stairs.

I am considering adding a stairwell to my home by excavating along the backside foundation of the house to basement level and then cutting a hole through the wall for a new entrance into the basement. This is a one level home with an 8 foot basement ceiling.

My question is: If the max rise = 8 , minimum run = 9 and stair width = 36, approximately how long of an excavation run do I need in order to put in a set of stairs based on those parameters.

By the way I've asked my question to get an idea of what Im looking at before I jump in completely with a contrator.

Thanks in advance for your time and feedback.

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Old 02-24-2008, 02:16 PM   #2
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Need total rise. From the base to the top of the last step. 8 1/4 rise is too steep.

Calculator is set for: Inches

Total Rise 7 7/8" rise and 10" run (steepest)

Rise 7 3/8

Run 10

Rises 13

Runs 12

Total Run 120

Length of Stringer Board 161 19/32

Last edited by redline; 02-24-2008 at 02:25 PM.
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Old 02-24-2008, 02:58 PM   #3
Join Date: Feb 2008
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Thanks for the reply.

Just to make sure I'm with you. I need approximately a 13.5 foot excavation opening to run the stringer board.

And while I'm thinking about it, I would be coming down the stairs and making a right hand turn through the new opening in the wall to access the basement. This would then mean that I need a 36 inch minimum base from the end of the last bottom tread to the forward wall (running with the stairwell) to creat the new opening?
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Old 02-24-2008, 06:34 PM   #4
Custom Cabinet Maker
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Location: Netcong NJ
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You also have just created a new swimming pool also :{
Big hole, no bigger drain system, lots of water bad bad
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Old 02-24-2008, 07:36 PM   #5
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The stairwell will be totally enclosed as part of a small addition that I am considering. I'm thinking that the addition is getting bigger by the day. May have to totally scrap my idea.
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Old 02-24-2008, 07:51 PM   #6
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Posts: 314


Are you in a frost prone area?

This needs addressing to figure if you big to the bottom of the footing or beyond to do frost walls which would be measured from the bottom of the stairs slab and down...all the way around, including below the existing footing.

It's not a cheap job to do right

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