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Old 11-16-2017, 10:28 PM   #1
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New basement staircase with landing


Im building a new staircase going to the basement and have a few questions.

Here is the design. There is a landing at the bottom of the stairs.


I already have the stringer measured and cut out. Just need to trim the bottom and top.


The opening is laid out and the half wall/bookcase guardrail is partially framed.


My questions are with attaching the bottom of the stringer. The stringers are 2x12 doug fir and i dont want the doug fir sitting on concrete.

I have a few options I am thinking of.

A)
Cut 1.5 off the bottom of the entire stringer and notch out for a 2x4 kickplate so it can sit on a pressure treated 2x8 or 2x10 with a 2x4 kickplate on top of it. Obviously I would anchor the 2x4 and 2x8 or 2x10 into the concrete with proper concrete fasteners. Then build a landing out of PT 2x stock up to the first step and lay a sheet of 3/4 plywood subfloor over the landing and first stringer step.


B)
build a landing first which would be little longer out of PT 2x stock so the landing extends past the first step. Then cut the bottom of the stringer to fit onto the landing using a 2x4 Doug for kickplate.

Im leaning towards option A What do you all think?
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Old 11-17-2017, 01:38 AM   #2
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Re: New basement staircase with landing


Put sill gasket or 6 mil poly between wood and concrete, no need for treated in the house here.
https://www.lowes.ca/insulation-acce..._g1589383.html

Build the landing first and the stingers on that.
The finished height between any and all risers top, bottom and landings are with in 1/4" of each other, And never more than 7 7/8" high.
Looking at the stringer, I don't think you are hitting the height requirement.
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Old 11-17-2017, 06:48 AM   #3
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Re: New basement staircase with landing


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Originally Posted by Nealtw View Post
Put sill gasket or 6 mil poly between wood and concrete, no need for treated in the house here.
https://www.lowes.ca/insulation-acce..._g1589383.html

Build the landing first and the stingers on that.
The finished height between any and all risers top, bottom and landings are with in 1/4" of each other, And never more than 7 7/8" high.
Looking at the stringer, I don't think you are hitting the height requirement.


That stringer is extra long in the picture with 3 extra steps. The rise is 7-7/8 and the run is 9. The height requirement is dead on with the treads and risers installed.
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Old 11-17-2017, 08:02 AM   #4
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Re: New basement staircase with landing


What is your floor to floor height measurement.? Top to top.
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Old 11-17-2017, 09:27 AM   #5
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New basement staircase with landing


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Originally Posted by ron45 View Post
What is your floor to floor height measurement.? Top to top.

Im not worried about anything with the heights. I have that all measured and figured out to be within code. I dont have exact number in front of me right now but its about 94.5 once the basement dimple membrane and 3/4 plywood subfloor is accounted for. Divide that by 12 and you 7-7/8 of rise. Actually I think the actual height was 94.625 giving me 7.88 of rise. The building inspector said as long as the steps have under 8 of rise and each step is close to one another hell be happy.

The landing is needed to have at least a 36 clearance at the bottom.
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Last edited by veeps; 11-17-2017 at 09:31 AM.
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Old 11-17-2017, 07:02 PM   #6
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Re: New basement staircase with landing


Your numbers don't add up.

You claim your risers are 7 7/8" and you have 11.
7 7/8 x 11 = 86 5/8 " or 7'-2 5/8"

Bottom line is if we can't do the math, we can't help you.
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Old 11-17-2017, 09:30 PM   #7
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Re: New basement staircase with landing


Quote:
Originally Posted by ron45 View Post
Your numbers don't add up.

You claim your risers are 7 7/8" and you have 11.
7 7/8 x 11 = 86 5/8 " or 7'-2 5/8"

Bottom line is if we can't do the math, we can't help you.


Add the landing which is 7-7/8 off the basement floor which makes 12.
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Old 11-20-2017, 08:09 PM   #8
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to me seems like your rise is on the high side and treads are too narrow, most codes say 10" is the minimum
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Old 11-20-2017, 08:30 PM   #9
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Re: New basement staircase with landing


Quote:
Originally Posted by veeps View Post
Add the landing which is 7-7/8” off the basement floor which makes 12.
If you put a post beside the landing you might be able to get the landing up to the second step height by cutting that joist back a little for head room.

Maybe.........
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