Rigid Foam Insulation Over Wood Siding

Is replacing wood siding with vinyl and.

Rigid foam insulation over wood siding.

Fit the rigid foam insulation snugly and seal all. Plus rigid foam insulation applied over the outside walls. With foam sheathing an air space is essential both to reduce the siding s water uptake and to provide a. Siding over rigid foam.

It adds up to a robust system. Always follow the manufacturer s instructions for installing rigid foam insulation. What are the risks of installing cedar siding directly over foil faced rigid foam insulation should tar paper or housewrap be used as well. 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.

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. Readers are constantly asking if the rigid insulation is supposed to be installed over the building wrap or vice versa. Rigid foam over building wrap. When applying james hardie siding directly over the combined thickness of foam sheathing continuous insulation and other non nailable substrates e g.

When installing wood siding over rigid foam sheathing you must protect the siding from moisture and heat buildup and use proper nailing. 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. How to install rigid foam under siding.

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. To secure the foam use two inch cap nails. He would like to keep it on and simply put the new rigid insulation over the siding. The contractor has ripped off a few layers of asphalt siding and is now down to the original siding.

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

It seems this will create some nice air pockets which be. Of course i did this all knowing my warranty would be void. The nails have a plastic cap that keeps them from damaging the foam. One of the most asked questions on our site is related to this article.

Wood siding including cedar siding should be installed over an air space regardless of the type of sheathing used. Moisture protection and heat buildup.