Expansion Gap For Siding

Do not nail through overlaps.

Expansion gap for siding.

Choose the right nails. As a result the expansion gap between the top of the tongue and bottom of the groove can range from o to 1 8. Always caulk between the siding and the trim. Allow for expansion and contraction.

Face nail with two nails per piece for 8 inches patterns and wider keeping nails 2 1 2 to 3 inches apart to allow for dimensional movement without splitting. Remove any sawdust dirt or debris from the gap to prep it for finishing. Siding must be cut in lengths to provide for expansion. For siding up to 6 inches wide use one nail one inch up from the lap.

Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement. An improper expansion gap may have similar consequences to the results shown above especially if the milling process is irregular. Allowance should be made for expansion and contraction by leaving a 1 4 6 4mm gap between the siding and all corner posts and channels. Gap for expansion wherever siding butts accessories.

If the panels are 20 feet 6 1 meters or longer refer to the manufacturer s instructions for how to increase the gap. Use a keyhole or reciprocating saw with a fine tooth blade to remove enough material from one of the pieces of lap siding. Vertical trim gap caulking. Allow a 1 4 in.

Allow a 1 8 inch expansion gap between pieces if the siding is air or kiln dried. When installing in freezing weather below 40. Increase to 3 8 9 5mm when installing in temperatures below 40 f 4 4 c.