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TONGUE & GROOVE
Tongue and groove siding can be installed horizontally or vertically. In horizontal application, start at the bottom and work up with the grove edges facing downwards to assure a weather-tight wall. Siding up to 6" (152mm) wide can be blind nailed with one siding nail per bearing toe-nailed through the base of each tongue. Wider siding should be face nailed using two nails per bearing. Ring shank nails must penetrate 1¼" (32mm) into solid wood (see figure below).
In vertical application, start at one corner with grooved edge toward the adjacent wall. Use a level or plumbline to ensure that the first board is installed vertically. The grooved edge of the first board may have to be trimmed to ensure a flush fit. Siding is nailed to horizontal blocking lines installed between studs or to furring strips (see Wall Construction). As with horizontal installation, pieces up to 6" (152mm) can be blind nailed and wider pieces should be face nailed.

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