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Why are no power tools allowed?
I've only volunteered at Habitat a few times, but it seems to depend on the group's experience and the job. I've been on a Habitat crew installing a roof with a few people who'd volunteered on that job before and they let us use a roofing nailer. Earlier at that job site, we had a crew of people trying to look good for a photo op who had to be told which end of the hammer to use, no air nailers or anything else fun on that one. The supervisor used the saw, everything else was hammer and nail.