North Carolina builder Danny Kelly has figured out a way to install a subfloor on an average-size house in about an hour. With a four-person crew, two carpenters move and cut panels, and two place and nail the sheets to the joists. This article provides step-by-step instructions for both teams, as well as a list of dos and don’ts to follow. A key time-saving technique that Kelly’s crews follow is letting panels overhang the band joist until all of them are in place. They can then be cut flush with the band joist. Likewise, Kelly recommends cutting in place odd-sized panels such as the ones around a crawlspace opening. A sidebar by Massachusetts builder Brian McCarthy explains how to install a new subfloor in an old house that’s out of square.
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