Insulation Under Hardie Siding

The insulative capabilities of our three siding materials are as follows.

Insulation under hardie siding.

Exterior rigid foam w modern hardie plank siding details. 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. Would it be better insulation if i remove the celotex and use a 1 foam board instead.

The building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall. I ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years. How to install rigid foam under siding. 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.

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. When it comes to siding insulation is important. And other non nailable substrates e g. 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.

Over the span of a year a good siding material can save you thousands of dollars in energy costs. February 13 2013 exteriors insulation air sealing siding.