I used the decking with the tin foil on when I built our laundry room (barn style building attached to the house) as it was supposed to keep heat from building up in the loft part. I am not sure what "R" value it has. The loft part isn't otherwise insulated but the laundry room ceiling/walls are.
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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