[Jonscheets]

My NJ house was built in 65 and has a den that I believe is on a concrete foundation, as the basement does not go under it. It is carpeted now and I want to install a floating wood floor in the room. I remove both register covers to verify the subfloor and it looks like there is a sheet of copper under the carpet padding. Has anyone heard of this? I am not sure how to work with this. Thanks in advance

 

[joecaption]

Highly unlikely, and I'd have to see it to believe it.
If the carpets coming out anyway remove the 1/4 round and pull the carpet back for a better look.

 

[Seattle2k]

maybe it's foil tape, often used to air-seal the gaps between the air register and subfloor?

 

[joecaption]

That would be my guess.
Way to expencive to use now.

 

[iliveinapark]

I just kinda ran into this... Also in NJ. I had to adjust a radiator pipe and open the hole up a 1/2". I started cutting into sheet copper between the wood subfloor and other topping layers. I didn't try removing more than I had to but i think this might have something to do with a heating flashing technique to yesteryear.