LAP SIDING
Lap sidings can be installed horizontally or vertically. For horizonal applications, start with the bottom course and work up with channels pointing upwards. Allow a 1/8" (3mm) expansion gap between pieces if the siding is air-or-kiln-dried. Do not nail through overlaps. For siding up to 6" (152mm) wide, use one nail one inch up from the lap. Face nail with two nails per bearing for 8" (203mm) patterns and wider, keeping nails 2½ to 3" (63 to 76mm) apart to allow for dimensional movement without splitting.
For vertical applications, siding should be nailed to horizontal blocking lines or furring strips (see Wall Construction).
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