Rigid Foam Under Vinyl Siding

Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold.

Rigid foam under vinyl siding.

Almost any type of siding can be installed over the rigid foam cedar or redwood planks exterior plywood sheets cement fiber board or vinyl siding are common options. Apply sealant around windows doors and trim. Installing foam board insulation under vinyl siding today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding. This detail is used with both new construction and also with renovation work.

To secure the foam use two inch cap nails. Heating costs increase every year making insulation more and more important. And even though some manufacturers call it rigid foam insulation for the purpose of vinyl siding it basically has the same insulating value as a piece of plywood. In reality rigid foam board which sometimes comes in fanfold usually only has an insulating factor of r 1 and does not add any appreciable insulation effect to your home.

Nevertheless some manufacturers have no objection to the installation of vinyl siding over foil faced foam. Although rigid foam insulation is more expensive than fiberglass insulation it is more efficient. Whenever vinyl siding is installed over rigid foam with or without foil facing studs should be spaced no more than 16 inches on center and the thickness of the foam should be limited to 1 inch. It is designed to prevent a house from losing heat.

In a typical situation.