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How to Install Exterior Rigid Foam, Part 2

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Insulation & Air Sealing

How to Install Exterior Rigid Foam, Part 2

On the second layer, offset and tape the seams, and use the rainscreen strapping to hold everything in place

By By Dan Morrison and Sal Alfano October 7, 2016
installing rigid foam insulation on home exterior
This article first appeared in the October 2016 issue of Pro Remodeler.

Last fall, remodeler David Joyce, owner of Synergy Construction, in Lancaster, Mass., and his crew performed a deep energy retrofit and gut rehab on a home in Concord. To boost the envelope’s R-value, they added 4 inches of polyisocyanurate foam in two 2-inch layers to the walls and roof. In Part 1, we looked at details in the first layer of wall foam, which was installed over the existing T1-11 siding. Here in Part 2, we focus on the installation of the second layer of foam as well as strapping for the rainscreen siding assembly. To watch videos of the complete process, click here.

This article is adapted from a video originally produced for and published on ProTradeCraft.com. Many thanks to Synergy Construction’s David Joyce, Calvin Cutts, Damien Higgins, and Patrick Burke for loaning us their jobsite.

written by

Dan Morrison

Dan Morrison is senior technical editor of ProTradeCraft.com, a sister site to Professional Remodeler.

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