Is there a site that gives rated capacity of floor trusses based on dimensions? Thanks, Rick

How could there be? There are so many variables that it would be dangerous to attempt to do so. Your best bet is the actual manufacturer of the trusses...they are the only ones who would know the exact configuration of the truss, the exact connections used, the exact span, the exact species and grade of lumber used (assuming they are wood trusses), etc.

Thanks. I will see if I can find out who made them. When I complete the bonus room above the garage I want to be sure I don't get up one morning and find the pooltable on top of the cars .

Later, Rick

A pool table is a specific structural problem. Generally they weigh in excess of 1200 pounds and have maybe 6 legs. That produces a bunch of concentrated loads which are not all equal, and not the uniformly distributed load that floor structures are designed for. Theoretically, the floor structure also should (key word: should) be able to take a concentrated load of 200 pounds at any one point, but the pool table could produce a load somewhat greater than that, and at at least two, and maybe six, points. You want that load to arrive at something stronger than just the subfloor, so if it's not directly on a truss, it should be on some sort of blocking or reinforcing between trusses. However, trusses won't like a concentrated load on them just anywhere...the loads should ideally occur at a "panel point", meaning the tip of one of the triangles in the truss. The reason is to eliminate bending loads on the top or bottom chords. So, even blocking should be carefully located, and one really should not alter the truss or introduce any strange loads like that on them, without verifying their capacity. I think some professional help from someone who is qualified would be a good idea.

Thanks for the info. If I can find the manufacturer I'll inquiry of them how they would recommend I put additional support if required.

Later, Rick