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.

February 13 2013 exteriors insulation air sealing siding. 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. Would it be better insulation if i remove the celotex and use a 1 foam board instead. Of the three materials reviewed james hardie has the worst insulation.

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

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. 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.

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. Exterior rigid foam w modern hardie plank siding details.