Installing Vinyl Siding Over Foam Insulation

The foam on the outside keeps the wood frame inside the wall warm and dry in.

Installing vinyl siding over foam insulation. It typically is installed over rigid foam board insulation fastened to wood wall sheathing. Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold. One of the biggest questions homeowners have about house wrap is whether it can be installed together with foam insulation. To secure the foam use two inch cap nails.

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 type of insulation may change and flatten the specialty built in contour of the panel causing the siding to bulge or ripple. To be an effective weather resistive barrier though the seams of the fan fold must be carefully taped since any seam can provide a pathway for water to reach the structure under the foam. Vinyl siding must be installed against a flat surface.

If the wood siding is beveled or lapped you. Before installing vinyl siding over existing wood siding we first install a layer of fan fold foam insulation. Some manufacturers strongly recommend against the use of drop in type foam or fiberboard behind its vinyl siding. Existing wood siding must be in good shape with no rot or mold and fastened tightly to the wall.

Always follow the manufacturer s instructions for installing rigid foam insulation. The answer happily is yes. Installing house wrap with rigid foam insulation. Apply sealant around windows doors and trim.

The by the book answer to your question is that vinyl siding manufacturers require a flat solid supportive surface and limit foam installed under their siding to a maximum of 1 in. Installing vinyl siding over wood siding wood must be sound. This detail is used with both new construction and also with renovation work. Siding over rigid foam.

Below are some of the design details along with the benefits. A corresponding editor paul fisette responds. Vinyl siding can be used in original construction or as a replacement for old siding. Plus rigid foam insulation applied over the outside walls.

It adds up to a robust system. Of foam and you can t use furring strips which are not a flat solid surface without voiding the warranty. Rigid foam will shed any water that gets past leaky vinyl siding. In fact the two products combined make your home super insulated from outside wind and weather.

Is the fan fold foam an adequate weather resistive barrier.