Rigid Foam Insulation Over Wood Siding

He would like to keep it on and simply put the new rigid insulation over the siding.

Rigid foam insulation over wood siding. When installing wood siding over rigid foam sheathing you must protect the siding from moisture and heat buildup and use proper nailing. Rigid foam over building wrap. Siding over rigid foam. Fit the rigid foam insulation snugly and seal all.

One of the most asked questions on our site is related to this article. With foam sheathing an air space is essential both to reduce the siding s water uptake and to provide a. Plus rigid foam insulation applied over the outside walls. Lp siding with fern strips over insulation.

The nails have a plastic cap that keeps them from damaging the foam. Of course i did this all knowing my warranty would be void. When applying james hardie siding directly over the combined thickness of foam sheathing continuous insulation and other non nailable substrates e g. Moisture protection and heat buildup.

How to install rigid foam under siding. Wood siding including cedar siding should be installed over an air space regardless of the type of sheathing used. What are the risks of installing cedar siding directly over foil faced rigid foam insulation should tar paper or housewrap be used as well. To secure the foam use two inch cap nails.

Gypsum sheathing up to 1 inch thick the foam sheathing and other non nailable substrates do not have nail holding capacity. Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold. This is especially true if the wall is filled with fiberglass batt insulation. Well call me half hazard.

Since foil faced foam is a moisture barrier it should be used with a continuous film vapor retarder on the inside wall. Is replacing wood siding with vinyl and. It seems this will create some nice air pockets which be. Readers are constantly asking if the rigid insulation is supposed to be installed over the building wrap or vice versa.

Always follow the manufacturer s instructions for installing rigid foam insulation. It adds up to a robust system. The contractor has ripped off a few layers of asphalt siding and is now down to the original siding. The foam on the outside keeps the wood frame inside the wall warm and dry in.

Many houses built today have a double wall type of insulation with fiberglass batts fastened between the studs on the inside and rigid foam board over. We have a historic house that is undergoing a deep energy retrofit with rigid insulation being applied to the outside and then strapping and new siding.