(From email:)
Hi,
Your product looks wonderful. On the previous page I read that I could send you a problem and it “may appear” on the web site…….
I want to add second floor in his recently completed shop. THe building has 12 foot eaves with vaulted ceilings. With head room being an issue, we want to keep the floor joist as narrow as possible, and I also may want to put a pool table up there. The clear span is just under 16′. If possible, I want to use double 2×8 floor joist. If this will work. do I need to put them on 12″ or 16″ centers? I plan on using 3/4 inch or 1.125 inch T&G plywood underlayment for the floor.
Thanks in advance if you choose to accept this mission.
Rick Krause
TIM’S RESPONSE
Hi Rick,
Thanks for asking. Attached is the printout for your floor joist. You could use 2, 2×8 at 16″ OC and be safe, but I guarantee the floor will be bouncy. If you used 12″ OC, it would still be bouncy. I understand your height constraint and so you might be okay with the bounciness as a tradeoff for the headroom of 2×8 joists.
If you wanted a stiff floor you’d have to use deeper joists. The analysis in ProBeam would be exactly the same except you’d pump up the deflection criteria to say L/600 and L/480.
Thanks again.