How Much Of A Gap Do You Need In Siding

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.

How much of a gap do you need in siding.

Correct methods and techniques. Do i have to caulk at butt joints. On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked. Install lap siding without shiplap edges to incorporate a 3 16 inch gap at the butt joints between adjacent pieces of siding.

Always caulk between the siding and the trim. Gap for expansion wherever siding butts accessories. Vertical trim gap caulking. We need air circulation behind these boards and the opening acts as a water exit should water ever go behind the boards.

The eighth inch spacing provides for a safer surface for walking. 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. How much space do you need between lap siding pieces. Both sizes have their pros and cons.

Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement. When installing in freezing weather below 40. Generally an acceptable gap between deck boards is between 1 8 inch and 1 4 inch. Do not caulk between siding and any built in receiving channels located at or around windows.

Many jurisdictions following the international building code which requires a minimum 1 8 inch spacing between boards. Siding must be cut in lengths to provide for expansion. Allow a 1 4 in.