Copper pipes under concrete floor

Exactly. I will definitely need to improve my ASCII art. I got nowhere near as good a drawing as that.

Reply to
Grumps
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Not exactly speedfit or Hep20 though is it! ;-)

Reply to
John Rumm

Well, the couplings for the individual house feeds looked a bit cheap-and-cheerful, they had to do mine twice, blanking off the first attempt.

Reply to
Kate

I wonder how they cut it?

Reply to
Andy Hall

So if you wanted could you use a regular copper pipe, put pip insulation around it, tape up the joints with gaffer/duct tape and the concrete it into the slab

-- Cordless Crazy

Reply to
Cordless Crazy

Yup - as long as you chose an insulation where the wet mortar would not soak through it while wet

Reply to
John Rumm

On possibility is to use standard insulation round the pipe and then either tape, or better still, use a bit of trunking

Reply to
The Natural Philosopher

Um. The 3m runs to existing pipework aren't an issue, as long as there's a bit of give at that end, and/or the long runs through the wall have some room for sideways movement. The 4.5m runs through the wall will put some strain on the connections to the radiator, though, which will have to be taken by flexing in the vertical connections if the runs are exactly like this. You'd be better off like this (I'll only do the LH rad. connection):

########## ########## | | | | \ \ \ \____________________ \_____________________\_____ \ \ \ \

Reply to
Chris Bacon

For the OP's situation he needs a fair amount of free play in the piping, so a trunking would be useful.

Reply to
Chris Bacon

That makes a lot of sense. Of course, it now goes OT as my wife has decided that I'm too slow and we'll get a plumber in (not d-i-y any more). Do you think Mr Plumber will consider the expansion issues? I'm going to have to find a tactful way of telling him his job.

Reply to
Grumps

He only needs a few mm of expansion room in total along the length.

Personally I would bury plastic sleeving pipe and then run speedfit through it, then there is no need to worry about additional pipe protection and accommodating movement.

Reply to
John Rumm

There is more expansion with Speedfit than with copper, but I think that this is a more sensible solution. As long as the pipe is cut properly with a cutter then it should be fine.

It's probably OK to cut the conduit pipe with a hacksaw, though.

Reply to
Andy Hall

You could cut the speedfit pipe with a hacksaw too if you used inserts and compression fittings.

Reply to
Richard Conway

This debate has been run many times. Results can be tearfull.

Reply to
Andy Hall

Results of cutting with a hacksaw, or starting the debate?

Reply to
Richard Conway

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