Originally Posted By: roconnor
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", and the following are some of the better documents/links I have for these. I think the most important thing for I-Joists is that after they are trimmed to fit in length, the top/bottom flanges can not be cut, drilled, or notched
… but the webs can be cut up pretty good (see page 15 on the general link). And builders always seem to forget the squash blocks, which are really important because exterior/bearing walls usually sit on these … the webs are usually particleboard, which doesn’t have a lot of bearing strength to begin with, and is like a wet napkin if exposed to moisture.
Squash Blocks: http://www.apawood.org/pdfs/managed/A755.pdf
Mark is correct that the typical open web joists must be ordered to length, and can not be trimmed in length to fit in the field. There is a newer product called a "TrimJoist" which is an open web joist with solid ends that can be trimmed in length to fit. But after installation, any open web joist should not be cut at all
Also, IRC R502.8 does not allow any cutting, drilling, or notching of an engineered wood product unless specifically permitted by the manufacturer. Enjoy!
Robert O'Connor, PE
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