max span for TJI pro 150? -- too much floor bounce!!!

[jjcold]

I can't seem to access the TJI info from their website, I can't open the PDF with my available programs. Anyway, could someone post the specs for TJI pro 150 I beam joists, 10 inch depth, set 16" OC, single story home. I'm looking for max span on these joists. My new house has too much floor bounce, and I think they made a mistake to use only one center beam that creates a span of 15'. My house was extended 2 feet on the back end, that made the span 2 feet longer, and I just know the building department wasn't presented with plans that reflect that change. Thanks.

[Rich]

TJI Pro 150 - 9.5" depth @ 16" o.c. with L/480 deflection criteria
Max Span with 40 Live Load & 10 Dead Load - 15'-7"

[jjcold]

Again - Thank you Rich! I actually got through to the county building inspection dept and had a wonderful long talk with one of the inspectors. He looked it up and quoted 17' 2" Like he said, these maximums are enough to ensure my house won't break in two, but perhaps not enough to produce the solid, bounce free floor I want.

This summer I'll likely get underneath (at least I have a deep crawlspace, and still fairly "clean" down there!) and add center beams in between the space of the one I already have to create a max span of 7' 6". Will that stiffen things up a bit? Or, would it be a waste of time?? I plan to either sister two 2x6 or 2x8's as my beam (depending on cost advantage) , or use a solid 4x6 or 4x8, and hold it all up with 4x4 posts on preformed pier blocks. As the building inspector told me, I'm not adding crucial load bearing strength, simply stiffening things up so my materials probably don't have to be as stiff and the center one is.

I think getting a stiffer floor in my house will go a long ways to increase my enjoyment of it. At least I know what to ask the builder for the NEXT time I have a house built!!

[Rich]

The 15'7 I quoted was for L/480 - what he suggested was L/360. Like you said - it's enough but not the bounce free floor. You can even go up to L/960 - but it's almost like walking on concrete.
I'd say a minimum of 2-2x8's would get quite a bit out of it - and if it doesn't add another one :)