Insulation Under Hardie Siding

The building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall.

Insulation under hardie siding.

Behind the 3 8 strapping is the tyvek creating an air cavity and drainage plane directly behind the hardie which prevents any moisture that penetrates the hardie and it will from deteriorating any of the other building elements. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. The insulation is then behind the tyvek. Exterior rigid foam w modern hardie plank siding details.

February 13 2013 exteriors insulation air sealing siding. Would it be better insulation if i remove the celotex and use a 1 foam board instead. 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. The insulative capabilities of our three siding materials are as follows.

Gypsum sheathing with combined thickness of 1 inch or less method 2 james hardie siding installed to furring strips that are attached through the c i. Hardie plank recommends a maximum of 1 of foam board celotex type material under their lap siding so the 1 2 foam and 1 2 celotex would be fine. My research seems to indicate that the foam board product is waterproof. Over the span of a year a good siding material can save you thousands of dollars in energy costs.

And other non nailable substrates e g. How to install rigid foam under siding.