Green Buildings Exterior Rigid Insulation Detail Hardi Siding Furning

The contractor has limited experience working with rigid exterior insulation remsberg writes and has concerns that installing siding directly over the foam may not be a great idea.

Green buildings exterior rigid insulation detail hardi siding furning.

James hardie recommends the use of building paper type weather resistive barriers with all siding products. Install rigid foam over or in place of plywood osb or other wall sheathing. Cladding attachment over thick exterior rigid. Install continuous rigid foam insulation or insulated siding to help reduce thermal bridging through wood or metal framed exterior walls.

2 water resistive barrier as defined by local building code that is manufactured to meet minimum 90 drainage efficiency when tested in accordance with astm e2273 or other recognized national standards. Some building codes exempt the use of weather resistive barriers over water repellent panel sheathing or exterior panels classified as weather resistive barriers. 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. Section 1 exterior wall drainage requirements 1 water resistive barrier and drainage requirements as defined by building code.

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. Insulation background current building code does provide prescriptive means to. 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. 3 5 fastener to siding 1 embedment 3 5 0 5 1 5 1 5.

James hardie will assume no responsibility. And other non nailable substrates e g. Plans call for vertical wood siding over a layer of rigid foam insulation. I ve had trouble finding any details on fastening siding to furring strips on a wall with exterior rigid foam insulation.

Your article is vey timely for me. Install over a water resistant barrier. Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. 3 water resistive barrier wrb as defined by building code and a.

If that sounds more or less straightforward the details are not. I appreciate you providing more info on this overlooked detail. 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.