Insulation, Radiant and Vapor Barriers - rigid foam insulation

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ottocat
04-22-08, 08:48 AM
I'm residing my home and would like to add more insulation.
From the inside out I have:
3/8 sheetrock
2/4 construction 16 o.c.
blown-in fiberglass w/celotex sheathing
some areas have fiberglass batts w/osb sheathing
I would like to add another 1/2 inch of rigid foam possibly polyisocyanurate (Dow) or another product (any ideas). I quess my main concern is moisture being trapped inside the wall cavity when I seal this all up. Vinyl siding will be installed over Tyvek to finish it up.
Snow Belt

connie
04-28-08, 01:33 PM
Hello, Ottocat...

This answer to your question can be found on the page listed below. It is the Department of Energy's recommendations for wall insulation.

There are "clickable" links, including one which answers your question about moisture control, as well as good information about adding insulation to existing walls.

http://www.eere.energy.gov/consumer/.../mytopic=11350

Let me know if this answered your question.

Connie