Green Buildings Exterior Rigid Insulation Detail Hardie Siding Furring

February 13 2013 exteriors insulation air sealing siding i ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years.

Green buildings exterior rigid insulation detail hardie siding furring.

3 5 fastener to siding 1 embedment 3 5 0 5 1 5 1 5. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. Insulated siding installed over furring strips alone would not be considered home insulation. I install 1x furring strips vertically over the foam to support fiber cement lap siding.

James hardie recommends that you consult with your design professional if you have questions regarding exterior wall drainage on your single family project. I have completed several projects that use foil faced polyiso as the exterior rigid insulation board. Some building codes exempt the use of weather resistive barriers over water repellent panel sheathing or exterior panels classified as weather resistive barriers. Increased use of continuous insulation such as rigid foam wall sheathing with greater thickness i e.

And other non nailable substrates e g. 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 building codes are all headed the way of requiring exterior rigid foam the 2012 iecc will require 1 2 foam to boost overall efficiency so i m really not too far ahead of my time with. James hardie recommends the use of building paper type weather resistive barriers with all siding products.

In order to increase the insulation values i want to first add a layer of the rigid foam board. Exterior rigid insulation 1x3 wood furring strips. The furring strips are attached to the studs with 4 screws at 6 to 8 o c. 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.

Cladding attachment over thick exterior rigid. Siding and the water resistive barrier as a best practice. Up to 4 in thickness is an effective means of meeting or exceeding modern energy code requirements or green building rating requirements such as leed energy star epa and the icc 700 national green building standard. Individual buildings all exterior cladding products including hard siding brick stone stucco and vinyl.

James hardie will assume no responsibility. I do not use the foam as the drainage plane however.