Expansion Gap For Siding

Do not nail through overlaps.

Expansion gap for siding.

Hardie boards should be joined in moderate contact. By having the small additional overlapped piece of siding you are still allowing for expansion but you are effectively covering all the gaps in the siding. If joint moulding option is selected add the thickness of the web to the gap allowing a net 3 16 in. When installing in freezing weather below 40.

Increase to 3 8 9 5mm when installing in temperatures below 40 f 4 4 c. If the panels are 20 feet 6 1 meters or longer refer to the manufacturer s instructions for how to increase the gap. For horizontal applications start with the bottom course and work up with the channels pointing upwards. Lap siding can be installed horizontally or vertically.

Do not caulk between siding and any built in receiving channels located at or around windows. These will serve as starter strips in which to lock the vertical siding. Do i need to seal edges at a butt joint. There is no need to leave a gap for expansion.

For siding up to 6 inches wide use one nail one inch up from the lap. 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. To avoid structural or aesthetic problems associated with temperature fluctuation take the following steps. Vertical trim gap caulking.

Leave 6 4mm gap at the top and bottom. Always caulk between the siding and the trim. Allow a 1 8 inch expansion gap between pieces if the siding is air or kiln dried. Vinyl siding contracts and expands as the outside temperature changes.

Siding must be cut in lengths to provide for expansion. Allowing for expansion and contraction. Vinyl siding must be nailed so expansion and contraction are not restricted. And it can move a lot through expansion and contraction especially along the length of the clapboard style panels.

If you are using primed siding you must seal all exposed cuts of siding including those at butt joints. Allow for expansion and contraction. To compensate for this movement adjacent siding panels are overlapped so that they can slide sideways past each other without buckling or creating gaps see nailing details and expansion gaps. This means that the boards should be touching each other when they are installed.

Gap for expansion wherever siding butts accessories. James hardie recommends that a slip sheet joint flashing is installed behind each butt joint in the siding. Allow a 1 4 in.