Insulation Under Hardie Siding

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

Insulation under hardie 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. 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. How to install rigid foam under siding. I m an architect in wisconsin climate zone 6b and am planning to build a 300 s f.

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. Well call me half hazard. 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.

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. I did use larger diameter ring shanked nails than specified to fasten the. But if you use wood clapboard siding foam sheathing can cause trouble. The building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall.

Addition to my house. I ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years. Moisture can get trapped between the siding and the foam leading to paint failure and causing clapboards to cup and curl. Exterior rigid foam w modern hardie plank siding details.

I d like to side it in fiber cement siding to match the existing house. James hardie is the world leader in fiber cement siding and backerboard. Lp siding with fern strips over insulation. Over the span of a year a good siding material can save you thousands of dollars in energy costs.

We ve been providing a better way to build for over 100 years. And other non nailable substrates e g. Of course i did this all knowing my warranty would be void. However if you re interested a residing project offers the perfect time to examine your home s weather barrier and exterior insulation and improve it if need be.