Insulation Under Hardie Siding

Over the span of a year a good siding material can save you thousands of dollars in energy costs.

Insulation under hardie siding. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. The building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall. Of the three materials reviewed james hardie has the worst insulation. 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.

When it comes to siding insulation is important. February 13 2013 exteriors insulation air sealing siding. And other non nailable substrates e g. The insulative capabilities of our three siding materials are as follows.

Would it be better insulation if i remove the celotex and use a 1 foam board instead. 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. 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 insulation is then behind the tyvek.

I ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years. 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.