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I was under my house in the crawlspace because I noticed some clanking when I turned on the hot water. I noticed that the copper piping is mounted to the floor joists with either plumbers tape or metal "U" type nails. In between the bracket and the copper pipe, I noticed that there was this black, thick, paper like material - almost felt like composite roof shingle - that I'm assuming is used to keep the pipes from clanking. Of course there was one mount that was missing this, thus the clanking I was hearing.
I'm curious if there is a specific product that plumbers use, or if there is a name for this material?
Could be tar paper, builder's paper, or whatever else was around at the time. Tar paper or roof underlayment is most likely. It wasn't professional, since staples aren't wide enough to do the job and plumbers tape is just plain ridiculous. There are copper strap hangers (preferred) other hangers or (worst case) soft metal tape that can be cut to size.
The "product" serves 2 functions.
1. Prevents the pipe from clanking by restricting movement.
2. Prevents galvanic corrosion which means it has to be non-metallic. Plastic is good.
The problem with these is the felt will eventually deteriorate- which maybe your problem- and then the copper is in contact with the galvanized causing electrolysis.
The better option is just plain old copper brackets for copper pipe-
I've always used the copper pipe straps and have not had any issues. In my old house, someone used cut up socks between the pipes and floor joists to stop the pipes from clanking (basement access). I installed copper straps instead and never had clanking.
These days there is a felt like material used. Looks like pieces of automotive sound deadening material cut into rectangles and wrapped around the pipe then the bracket gets placed over that.
I hope that the support/strapping material is copper also otherwise you may have a galvanic reaction over time
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