27 Nov '11, 11pm

A low cost alternative to "flash and batt" insulation? #green

I'm trying to find a cost effect solution to insulating the exterior walls of a 1900 vintage 2-1/2 story house. I'm located in Omaha - zone 5. I had originally thought using flash and batt insulation would be an effective way to form an air infiltration barrier and provide an r-value higher than available using 3-1/2 fiberglass batts. However, the cost of 1-1/2" of spray closed cell insulation was a concern. I now wonder if using EcoSeal sprayable caulk and squishing 6" of fiberglass insulation into a 4" cavity might not provide most of the benefit of "flash and batt" at a substantially lower cost. Mark Holladay, in his posting on September 23, 2011, "Air Sealing with Sprayable Caulk", was quick to point out that sprayable caulk was not the same as flash and batt insulation. Then, too, in his post and Q&A of July 10, 2009, "Installing Fiberglass Right", Martin explained th...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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