Insulation Under Hardie Siding

Exterior rigid foam w modern hardie plank siding details.

Insulation under hardie siding.

How to install rigid foam under siding. February 13 2013 exteriors insulation air sealing siding. Of the three materials reviewed james hardie has the worst insulation. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g.

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. The insulative capabilities of our three siding materials are as follows. The building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall. The insulation is then behind the tyvek.

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. Would it be better insulation if i remove the celotex and use a 1 foam board instead. 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. When it comes to siding insulation is important.

And other non nailable substrates e g. I ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years.