Tongue and groove siding can be installed horizontally or vertically. In horizontal application, start at the bottom
and work up with the groove edges facing downwards. Siding up to 6 inches 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 piece. Nails must penetrate 1-3/4 inches into solid wood.
In vertical application, start at one corner with grooved edge toward the adjacent wall. Use a level or plumb line
to ensure that the first board is installed plumb. 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. As with
horizontal installation, pieces up to 6 inches can be blind nailed and wider pieces should be face nailed.