How Much Of A Gap Do You Need In Siding

The eighth inch spacing provides for a safer surface for walking.

How much of a gap do you need in siding. Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement. Both sizes have their pros and cons. Do i have to caulk at butt joints. Cedar shake style products have a shiplap edge at their ends that automatically aligns adjacent pieces with the proper gap but it s still necessary to leave a 3 16 inch gap between the siding and trim pieces.

Siding must be cut in lengths to provide for expansion. Allow a 1 4 in. Lp requires a minimum 3 16 spacing at all butt joints. It depends on the option you choose but if joint caulking option is selected seal all gaps at butt joints with a high quality exterior sealant meeting the astm c920 minimum class 25 sealant.

Generally an acceptable gap between deck boards is between 1 8 inch and 1 4 inch. We need air circulation behind these boards and the opening acts as a water exit should water ever go behind the boards. Vinyl siding must be nailed so expansion and contraction are not restricted. Caulking siding trim windows doors etc.

Many jurisdictions following the international building code which requires a minimum 1 8 inch spacing between boards. Always caulk between the siding and the trim. Do not caulk between siding and any built in receiving channels located at or around windows. When installing in freezing weather below 40.

How much space do you need between lap siding pieces. Vertical trim gap caulking. Correct methods and techniques.