Insulation Under Hardie Siding

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

Insulation under hardie siding. Exterior rigid foam w modern hardie plank siding details. According to my calculations if i want to use rigid foam insulation on the outside of the 2x6 walls with r 21 fiberglass in the wall cavities i need at least r 11 25 in order to avoid condensation on the inside. February 13 2013 exteriors insulation air sealing siding. James hardie is the world leader in fiber cement siding and backerboard.

How to install rigid foam under siding. Over the span of a year a good siding material can save you thousands of dollars in energy costs. But if you use wood clapboard siding foam sheathing can cause trouble. When it comes to siding insulation is important.

I m an architect in wisconsin climate zone 6b and am planning to build a 300 s f. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. Of course i did this all knowing my warranty would be void. And other non nailable substrates e g.

We ve been providing a better way to build for over 100 years. Last year i installed lp lap smart trim shingles and the 4x8 sheets of lp with batts all over 3 of continous xps foam using fern strips. Lp siding with fern strips over 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.

Well call me half hazard. I did use larger diameter ring shanked nails than specified to fasten the. In the end the decision to install house wrap under your siding is a personal one that you should make after discussing it with your contractor. 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.

The insulative capabilities of our three siding materials are as follows. Moisture can get trapped between the siding and the foam leading to paint failure and causing clapboards to cup and curl. 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.