Expansion Gap For Siding

Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement.

Expansion gap for siding.

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. Vertical trim gap caulking. Choose the right nails. Allow for expansion and contraction.

By obtaining some additional siding and carefully preparing it small pieces can simply be snapped into place covering the wide gap your home builder is forced to leave for expansion. Always caulk between the siding and the trim. This means that the boards should be touching each other when they are installed. Increase to 3 8 9 5mm when installing in temperatures below 40 f 4 4 c.

Vinyl siding contracts and expands as the outside temperature changes. Hardie boards should be joined in moderate contact. James hardie recommends that a slip sheet joint flashing is installed behind each butt joint in the siding. 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.

Do not caulk between siding and any built in receiving channels located at or around windows. For horizontal applications start with the bottom course and work up with the channels pointing upwards. There is no need to leave a gap for expansion. 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.

Do i need to seal edges at a butt joint. These will serve as starter strips in which to lock the vertical siding. Allow a 1 4 in. Lap siding can be installed horizontally or vertically.

Siding must be cut in lengths to provide for expansion. 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. Do not nail through overlaps.

If joint moulding option is selected add the thickness of the web to the gap allowing a net 3 16 in. If the panels are 20 feet 6 1 meters or longer refer to the manufacturer s instructions for how to increase the gap. When installing in freezing weather below 40. And it can move a lot through expansion and contraction especially along the length of the clapboard style panels.

Gap for expansion wherever siding butts accessories. To avoid structural or aesthetic problems associated with temperature fluctuation take the following steps. For siding up to 6 inches wide use one nail one inch up from the lap.