My house has Copper pipework (Central heating & Gas) laid in the concrete
floor. Not at the time the floor was laid I might add. The concrete has
had small trenches cut out and the pipes laid in to them and filled with
some compound? Can anyone tell me what this compound might be?, and if it
is appropriate for the job (if not any suggestions for alternatives)? The
compound is like a very course carlite bonding consisting of particles about
the size of pea shingle. It is light grey (when cured) and very brittle and
I need to do some work altering the pipe work (I am looking forward to
trying to get the water out of them pipes :o( ) and I then will need to make
good the floor. My instinct would be to use a concrete mix to fill it in
but the pipe work is not deep enough to allow it to be covered with Denso
tape for protection in the concrete.
Advise much appreciated.
I would have thought that a levelling compound like latex screed might
do the trick for this sort of thing. I'm not sure what sort of effect it
would have on pipes; but I can't imagine it would be bad for them.
Sounds like they used Vermiculite, I think that's how you spell it. You
cover the pipes with it and then screed the last 2". I don't understand why
you say the pipes are not deep enough to cover them with Denso tape. Are you
saying the top of the pipes are level with the screeded floor?
I must admit it does look like Vermiculite that you find on the gardening
programs but I didn't think that cured?
The tops of the pipes are only a few mill below the top of the floor in many
places. Denso that I have used before is a few mill thick so would like to
avoid using it if possible. As the pipes are mostly round the edges of
rooms they are ot subject to foot traffic so strength is not paramount, just
a level surface.
I understand that direct contact between concrete type materials will allow
acid to eat away the copper. Hence the insulation. When I did my oil pipes I
ran them inside a plastic conduit and then concreted over that. They've been
OK now for 15 years.
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