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Condensation walls

Posted: Mon Apr 01, 2019 10:01 am
by motomech10
Hi,
The home is a 1983 with the original aluminum siding. I've attached a picture of a wall I recently opened up. I am trying to find out what the material that lines the inside of the aluminum exterior siding is. I am assuming it has something to do with condensation control? If that is correct?

Thanks