Expansion Gap For Siding

Gap for expansion wherever siding butts accessories.

Expansion gap for siding.

Increase to 3 8 9 5mm when installing in temperatures below 40 f 4 4 c. For siding up to 6 inches wide use one nail one inch up from the lap. When installing in freezing weather below 40. 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.

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. Remove any sawdust dirt or debris from the gap to prep it for finishing. Create a proper 3 16 space at minimum between the two pieces of siding.

If the panels are 20 feet 6 1 meters or longer refer to the manufacturer s instructions for how to increase the gap. Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement. 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. Allow a 1 8 inch expansion gap between pieces if the siding is air or kiln dried.

Allow for expansion and contraction. Do not caulk between siding and any built in receiving channels located at or around windows. As a result the expansion gap between the top of the tongue and bottom of the groove can range from o to 1 8. Allow a 1 4 in.

Siding must be cut in lengths to provide for expansion. Always caulk between the siding and the trim. An improper expansion gap may have similar consequences to the results shown above especially if the milling process is irregular.