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Old 08-08-2019, 11:23 AM   #1
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Attaching Stair Stringers to Steel L Beam


I am remodeling my loft condo and moving the stairs from underneath the mezzanine/loft, to the open area of the unit. The end of the loft is supported by an "L" beam (pictures attached). The new stairs will lead up to the loft on the right side of the pictures (where the loft meets the concrete wall). There will be a railing to the left of the stairs. Given this is an L shaped beam and not an I beam, any ideas of the best method of attaching the stair stringers/header to the beam? I am meeting with my contractor to discuss but would love some other opinions.

Thanks!
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Old 08-08-2019, 11:32 AM   #2
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Re: Attaching Stair Stringers to Steel L Beam


What is happening to the floor up stairs, you should have it extended over the top of the top riser?
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Old 08-08-2019, 11:58 AM   #3
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Re: Attaching Stair Stringers to Steel L Beam


@neal - thats a good point - we were going to try to re-use the existing hardwoods up stairs
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Old 08-08-2019, 12:06 PM   #4
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Re: Attaching Stair Stringers to Steel L Beam


We usually just nail a 3/4" plywood to the face of the floor about 12 inches high
You may want to wait until you have done all the math and laid out the stringers so you can just to just what is needed. for the steel I would use elevator bolts as they will pull in to just about flush, you will want bolts going the other way thru the plywood for the 2x4 that goes under the top tread.

https://www.homedepot.com/p/Hillman-...1012/202242428
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Old 08-08-2019, 12:36 PM   #5
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Re: Attaching Stair Stringers to Steel L Beam


Thanks Neal! One more question - are there any straps you prefer to use to tie together the wood stringers and the plywood/beam?
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Old 08-08-2019, 12:41 PM   #6
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Re: Attaching Stair Stringers to Steel L Beam


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Originally Posted by trgerrity86 View Post
Thanks Neal! One more question - are there any straps you prefer to use to tie together the wood stringers and the plywood/beam?
You nail thru the plywood into the back of the stringer and you nail the stringers into the 2x4 under the top tread, It ain't goin anywhere
And the bottom is also attached to the floor with a 2x4 behind the riser and the stringer is nailed to that.
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Old 08-08-2019, 12:51 PM   #7
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Re: Attaching Stair Stringers to Steel L Beam


Makes sense - thanks so much!
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Old 08-08-2019, 12:58 PM   #8
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Re: Attaching Stair Stringers to Steel L Beam


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Makes sense - thanks so much!
What are you going to do with the floor upstairs?
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Old 08-08-2019, 03:54 PM   #9
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Re: Attaching Stair Stringers to Steel L Beam


I was thinking the plywood attachment would run up to same hight as the sub floor, then adding a piece of nose trim at the top. Would that work?
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Old 08-09-2019, 12:30 AM   #10
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Re: Attaching Stair Stringers to Steel L Beam


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I was thinking the plywood attachment would run up to same hight as the sub floor, then adding a piece of nose trim at the top. Would that work?
So you would have the plywood and the the finish riser and bring the nose over that.
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Old 08-09-2019, 01:00 PM   #11
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Re: Attaching Stair Stringers to Steel L Beam


Yes sir!

One more related question - I would really like to side mount the posts for the railing that will run across the loft and tie into the stairs. I think that means that I would need to stack a pair of 2x6 or 2x8s and mount them to the outside of the beam so the side mounts have some meat to mount. Can I just run the 2x6's across and but them against the outside of the stair stringer, or is there a more creative way to do that?
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Old 08-09-2019, 01:08 PM   #12
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Re: Attaching Stair Stringers to Steel L Beam


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Originally Posted by trgerrity86 View Post
Yes sir!

One more related question - I would really like to side mount the posts for the railing that will run across the loft and tie into the stairs. I think that means that I would need to stack a pair of 2x6 or 2x8s and mount them to the outside of the beam so the side mounts have some meat to mount. Can I just run the 2x6's across and but them against the outside of the stair stringer, or is there a more creative way to do that?
That is as good as any other method. Just make sure the bolts holding those boards will be close to where the railing posts will go.
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