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Question:

What is the name of the type of insulation that goes underneath siding?

NOT FLASHINGits a thin (1/4-1/2inch thick) rigid insulation board and one side is shiny reflective and metallic.Anyone know the nameso I can ask for it at Home Dep or Lowes

Answer:

You can outdo him if you have an old coonhound lying on the couch in your front yard in front of several pink flamingo lawn ornaments, a few lawn gnomes with the paint chipping off, torn curtains in your windows and some sort of wild TV antenna on top of the roof that looks like it's about 5 metal antennas put together with some duct tape and old wire hangers, but is sitting opposite the satellite dishAnd a dead palm tree.
Foil Backed - Rigid Insulation Wall Sheathing - There are several types and thicknessesPolyiso has the best R-Value per inch - Expanded Poly-Styrene is less expensiveMake sure your substrate is adequate and you are using the right/approved fasteners for the type of siding you are putting over it.

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