In article ,
Roger Mills writes:
On 03/04/2018 14:02, Graham. wrote:
On 03/04/18 13:16, Graham. wrote:

I only have the bare bones of this from my daughter at present.

She has new "wet" underfloor heating laid. The tiller was laying floor
tiles on the screed,, and cut through the tubing (angle grinder?).

Is this repairable, or is it a break up the floor and start again job?

Reminds me of a friend having a kitchen done professionally.
The electrician had laid the electric heating element on the
floor ready for the tiler to tile over. The way the tiler
grouted was to bang the trowel edge into the gaps to get the
pointing in, and, you guessed it, he cut through the element
at probably every tile edge. Up it all came again...

How one trade likes to bugger up the work of another...

it is at least dig enough space out to put a coupling in and then bury
it all again

Further information: It seems it was just above the floor, involving
some expanding foam that presumably he was tidying up.


In that case, you can use a push-fit coupler. I personally wouldn't be
happy with any joints *under* the screed 'cos it's a right pain if they
ever decide to leak.

Personally I wouldn't use a pushfit coupler in concrete.
The O-rings have a rated life of 25 years, although I've
had them fail after 10. Also, the expansion and contraction
cycling combined with a pushfit coupler that will and up
firmly immovable in the concrete might result in stresses
the seals won't handle long term.

I would use a standard brass compression fitting with pipe
inserts, and I might wrap it in denso tape to protect from the
concrete (and to give it a bit of padding).

(Can't help thinking there should be a sort of solvent
weld fix for this where you push the two ends into an
oversized length, painted with a suitable solvent.
Electrofusion weld would be another alternative if there
isn't a suitable solvent for the plastic.)

Remember to ensure system is pressurised to max normal
working pressure when laying the replacement concrete.

--
Andrew Gabriel
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