From: "Bill" 
Newsgroups: misc.consumers.house
Subject: Re: Vent Pipes wrapped in Alum Foil?
Date: Wed, 28 Nov 2007 07:35:09 -0800
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Just guessing, but maybe so a "stud finder with metal detector" could find 
the pipe in the wall? (So if someone is drilling a hole in the wall, they 
will not drill into the plastic pipe...)

They do this sort of with plastic underground lines. Run an electrical wire 
along with the pipe so you can later "locate" it.


"JP"  wrote in message
> We're remodeling and we are finding lots of plain foil wrapped around
> all the PVC pipe and in some of the walls.
>
> It's not there for insulation -- it's primarily on vent pipes and even
> some drain pipes (from the sink to the floor). House was built in
> 1980.
>
> We also found the bathrooms to have sunken floors by 1.5" (2x4 width)
> and filled in below the tile floors to make it level. Remodeler said
> they used to do this in areas where they would tile. The softer cement
> fill would keep the tile from cracking if the foundation cracked.
>
> We're mostly curious about the foil. It's not around any metal/copper
> pipes.
>
> -Jack