ECN Forum Forums General Topics of the Trade General Discussion Area prefab floor joists? how too?

Yes, some have pre-punched holes for utilities. I have found them to be tough to knock out. They do drill fast and where you drill is not as much of an issue as dimensional lumber.

One thing to watch for is the spacing. I have had to drill some that were on 12" centers. Make sure you have a right angle drill and a very short spur bit.