Hello. I build row houses in Philly and we have the need for one sided structural stairs between floors (left side hangs on a wall but right side is open above and below). We have had two different companies build us stairs and each has doubled the stringers with 2 2x, glued and nailed and presented them as done. After they installed them the stairs noticeably bounce on the structural stringer side. We have a 122″ rise and 160″ run. I cannot believe this is the ‘best’ that stairbuilding can offer – any ideas on how to take the bounce out? Thanks.
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You could be using LVL or PSL instead of sawn lumber and getting a stiffer stair. I would talk to a structural engineer or at least someone with some decent beam calc software and get some parameters from them. It is easy for someone with the right program to tell you what the deflection and stiffness will be for various materials.
Thanks, that is where we were heading material wise. We have the architect getting an engineer involved to do the calcs.
Think metal, at least for the supporting parts, a metal skeleton covered with the material of your choice.
More expensive and difficult to install, but the right thing to do.
LVL stringers and 2x risers.
Matt