Reflectix is pretty good stuff. I used it under my heated concrete floor to reflect the heat up (see pic #5 of my pics). I also used it in addition to 4" thick insulation when insulating my barn. I had to slit the reflectix in that instance - to avoid a double vapor barier with the 4" insulation and the reflectix. I does a great job of "reflecting" the sun during the summer months, and also reflecting the heat in during the winter months. For comparison purposes, my 50 year old house (1200 sq. foot) costs more than 50% of what my 3200 sq' foot barn costs to heat, which has a 'leaky' overhead door (my barn is also my office - so it's the same temperatur of my house).

When I poured my foundation, I ran some tubing from my house through the foundation (heated pour). Where the tubing was exposed outside, I wrapped it in reflectix to prevent heat loss. When it snowed, the reflectix collected snow before the grass, even though there was tubing carrying 100 degree water inside of it!

Hope that helps.
Jason

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