Expansion Gap For Siding

And it can move a lot through expansion and contraction especially along the length of the clapboard style panels.

Expansion gap for siding.

If you are using primed siding you must seal all exposed cuts of siding including those at butt joints. Leave 6 4mm gap at the top and bottom. Allow a 1 4 in. Hardie boards should be joined in moderate contact.

Always caulk between the siding and the trim. To avoid structural or aesthetic problems associated with temperature fluctuation take the following steps. Do i need to seal edges at a butt joint. If joint moulding option is selected add the thickness of the web to the gap allowing a net 3 16 in.

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. Do not nail through overlaps. Vinyl siding must be nailed so expansion and contraction are not restricted. James hardie recommends that a slip sheet joint flashing is installed behind each butt joint in the siding.

Allowing for expansion and contraction. For siding up to 6 inches wide use one nail one inch up from the lap. For horizontal applications start with the bottom course and work up with the channels pointing upwards. If the panels are 20 feet 6 1 meters or longer refer to the manufacturer s instructions for how to increase the gap.

Increase to 3 8 9 5mm when installing in temperatures below 40 f 4 4 c. Gap for expansion wherever siding butts accessories. These will serve as starter strips in which to lock the vertical siding. Vinyl siding contracts and expands as the outside temperature changes.

When installing in freezing weather below 40. 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. Lap siding can be installed horizontally or vertically. This means that the boards should be touching each other when they are installed.

Do not caulk between siding and any built in receiving channels located at or around windows. 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. Allow for expansion and contraction. Allow a 1 8 inch expansion gap between pieces if the siding is air or kiln dried.

Vertical trim gap caulking. There is no need to leave a gap for expansion. Siding must be cut in lengths to provide for expansion.