Deep Energy RetroFit Overview

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NYSERDA's Greg Pedrick outlines the first steps in renovating various older house in ways to save energy.
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Very enjoyable and informative presentation. I live in New England and am considering undergoing a deep retrofit of my 350 year old house. What I want to know is the material and type of insulation you are recommending on the exterior wall and why. Why two layers? Two layers makes the building very bulky and requires major refitting of all trim boards and windows. Is there a denser layer that can do the work of the two layers?

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