"SQLit" wrote in message
...

Exposed foam is a fire fuel looking for an ignition source. Please
provide
the source for this foam board. with 1" equals R-5... I bet you did not
read
the whole listing. This rating is part of an assembly.

Nope extruded board is 4.92
http://www.glacierbay.com/dowtest.asp
http://www.dow.com/styrofoam/na/pro-...s/perimate.htm

It is a fire retarded material, but should be covered with drywall to meet
fire codes.

The OP may want to look at this too
http://www.dow.com/styrofoam/na/pro-...erior_wall.htm



More insulation in the attic seems a better bet. I added R-30 this summer
and cut the a/c bills in half from July to August and more than 40% since.

Why not both?