How Much Of A Gap Do You Need In Siding

When installing in freezing weather below 40.

How much of a gap do you need in siding.

Do not caulk between siding and any built in receiving channels located at or around windows. The eighth inch spacing provides for a safer surface for walking. Always caulk between the siding and the trim. On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked.

Generally an acceptable gap between deck boards is between 1 8 inch and 1 4 inch. Caulking siding trim windows doors etc. Many jurisdictions following the international building code which requires a minimum 1 8 inch spacing between boards. 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.

We need air circulation behind these boards and the opening acts as a water exit should water ever go behind the boards. Do i have to caulk at butt joints. Both sizes have their pros and cons. 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.

Correct methods and techniques. Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement. Install lap siding without shiplap edges to incorporate a 3 16 inch gap at the butt joints between adjacent pieces of siding. Vertical trim gap caulking.

How much space do you need between lap siding pieces. Allow a 1 4 in. Gap for expansion wherever siding butts accessories.