How Much Of A Gap Do You Need In Siding

Both sizes have their pros and cons.

How much of a gap do you need in siding.

Install lap siding without shiplap edges to incorporate a 3 16 inch gap at the butt joints between adjacent pieces of siding. On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked. Vinyl siding must be nailed so expansion and contraction are not restricted. 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.

Allow a 1 4 in. We need air circulation behind these boards and the opening acts as a water exit should water ever go behind the boards. How much space do you need between lap siding pieces. Siding must be cut in lengths to provide for expansion.

Many jurisdictions following the international building code which requires a minimum 1 8 inch spacing between boards. Generally an acceptable gap between deck boards is between 1 8 inch and 1 4 inch. Lp requires a minimum 3 16 spacing at all butt joints. Caulking siding trim windows doors etc.

Do not caulk between siding and any built in receiving channels located at or around windows. Correct methods and techniques. Gap for expansion wherever siding butts accessories. 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.

When installing in freezing weather below 40. The eighth inch spacing provides for a safer surface for walking. Vertical trim gap caulking.