Rigid Foam Insulation Over Wood Siding

Lp siding with fern strips over insulation.

Rigid foam insulation over wood siding.

It adds up to a robust system. He would like to keep it on and simply put the new rigid insulation over the siding. The nails have a plastic cap that keeps them from damaging the foam. This is especially true if the wall is filled with fiberglass batt insulation.

With foam sheathing an air space is essential both to reduce the siding s water uptake and to provide a. To secure the foam use two inch cap nails. It seems this will create some nice air pockets which be. The contractor has ripped off a few layers of asphalt siding and is now down to the original siding.

Since foil faced foam is a moisture barrier it should be used with a continuous film vapor retarder on the inside wall. Moisture protection and heat buildup. Siding over rigid foam. Fit the rigid foam insulation snugly and seal all.

Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold. One of the most asked questions on our site is related to this article. Is replacing wood siding with vinyl and. Gypsum sheathing up to 1 inch thick the foam sheathing and other non nailable substrates do not have nail holding capacity.

Of course i did this all knowing my warranty would be void. Wood siding including cedar siding should be installed over an air space regardless of the type of sheathing used. Well call me half hazard. Readers are constantly asking if the rigid insulation is supposed to be installed over the building wrap or vice versa.

The foam on the outside keeps the wood frame inside the wall warm and dry in. Last year i installed lp lap smart trim shingles and the 4x8 sheets of lp with batts all over 3 of continous xps foam using fern strips. When applying james hardie siding directly over the combined thickness of foam sheathing continuous insulation and other non nailable substrates e g. 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.

How should wood siding be installed over rigid foam insulation. Cover the house walls with 4 by 8 foot sheets of rigid foam insulation typically 1 2 to 1 inch thick nailed to wood sheathing with 1 1 2 inch broad headed galvanized nails every 16 to 18 inches. 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. Rigid foam over building wrap.

When installing wood siding over rigid foam sheathing you must protect the siding from moisture and heat buildup and use proper nailing. Plus rigid foam insulation applied over the outside walls.