Mike,
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the car/truck noise has become a problem when tracking. So, I need to keep the noise out. I really don't want to tear into the walls. I'd like to install sheets of something on the inside walls, as well as over the one window in the room.
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I'm not an isolation expert, but I'm sure you'll need much more than thin sheets of
anything to make a dent in this problem. The cheapest
and most effective barrier is plain old sheet rock.
For your window you could make a one-inch thick plug from that, or maybe use MDF, and use rubber gaskets to seal the edges to the wall around the window when it's in place. As for the wall itself, adding a thin layer of vinyl will do very little if anything to help. Another layer of sheet rock will do more, but even that's not a total solution is the noise leakage is very bad.
--Ethan