Use Foil in Walls?

March/April 2005
This article originally appeared in the March/April 2005 issue of Home Energy Magazine.
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March 01, 2005
Q. I’m desperate for some balanced information. I’m putting new cement-based clapboard siding on my house on top of a plywood shell. The siding contractor said that he typically wraps the house in Tyvek. I live in the southwest corner of the Mojave Desert at about 3,200 ft above sea level and here we have both hot and cold seasons.We can go down to the teens in the winter, and at times in the summer it hits 120ºF. The climate is typically dry, but it can pour during the winter storm months. I want to do something to increase the heat-and-cool retention. I understand that Tyvek does not do this. I thought that there might be some thin insulative medium that we could apply under the painted cement siding. I researched on your Web site and found no mention of a material that I found at ( This is a reflective film to be installed in double layers and separated from the siding with a 1/4-inch gap. The site touts the improved heat-andcool retention provided by this material, which is called a radiant reflector. It is apparently not porous, and after ...

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