It should be okay to use but it's questionable as to how effective it would be.
The standard for attic insulation thickness here in the Northeast is a minimum of 12". Heating in the winter is a big deal for us. That's a major cost.
I use a combination of styrofoam and fiberglass that gives us a total thickness of over 24". I think the R value is something crazy like r-80 ? It works though. It really slows the transfer of heat from inside the house to the outdoors.
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It might be different depending on where you are in Texas. Air conditioning in the summer is your biggest cost. The surface of your roof gets over 140 degrees in the summer. What you're trying to do is block the heat from the outside from getting inside.
That's a different strategy. Insulation will help some, but what what you really want to do is vent the hell out of your roof and attic.
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