Scott P.E.

I know this is not a residential code quote, but the 2000 International Building Code section 715.7 states: Flexible ducts and air connectors shall not pass through any fire resistance rated assembly. Flexible air connectors shall not pass through any wall, floor, or ceiling. Section 715 only applies to fire rated assemblies only. Typically a residential house is type 5 construction which would not require fire dampers or have rated assemblies.

Thanks guys, good answers. Chad, The 2003 International Residential Code Table 502.3.1(2) has required spans for loads. A big factor is in the joist spacing. The wood species and grade is important too. However, making an assumption of a 40 psf live load and a 20 psf dead load total(the tile alone will be 12.5 psf in dead load) you will be in the ballpark with 13 ft. span for SS grade. The table shows a 24 inch joist spacing for 2x10 of Spruce-pine-fir SS grade at 13'-8". I'm sure it probably does not have a grade on it but check the wood closely because only the best quality wood will work. Notching, cutting, and drilling may present a problem too. This is book stuff though, the best advice is from the other guys who have seen the problems.

This is a great forum. You guys really know your stuff. My question is how can you estimate the age on a shingle roof? My old house had a 15 year old shingle roof on it and the inspector guessed right when I sold it. By the way, I am looking for a house and the last one I looked at had PB pipes in it. This forum really gave me the heads up on the problems with it. Thanks