Copper pipe in concrete

[Gordy]

I have to move a radiator to the other side of a doorway.

Without going into detail the easiest method is to create a channel across
the doorway (solid concrete floor) and route the 10mm flow and return in it,
then concrete back over the top.

So the question is, do I need to protect my copper from the concrete or will
it be ok??

Cheers

[Bod]

You need to insulate the pipe. While the cement is curing,
it attacks the copper. Standard pipe lagging will do the job.

[Nightjar]

On 09/05/2013 18:10, Gordy wrote:

Yes and no respectively. Denso tape is usually used, although I have
laid copper tube inside PVC conduit when that was all I had.

Colin Bignell

[Tim Watts]

Protect it without doubt.

1) Cement will attack it.

2) If the pipe wants to expand and contract it will eventually end up
rubbing itself to death.

The "old way" was wrap it in denso tape.

You could (and I would) slide it inside a bit of plastic pipe. Plastic water
pipe would be a good choice - it would allow a gentle bend for the pipe to
come up both sides. You could even replace the pipe in the future if needed.
--
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[Chris Bartram]

Protect it. Concrete attacks copper pipe.

[ARW]

Tim Watts wrote:
> On Thursday 09 May 2013 18:10 Gordy wrote in uk.d-i-y:
>
>> I have to move a radiator to the other side of a doorway.
>>
>> Without going into detail the easiest method is to create a channel
>> across the doorway (solid concrete floor) and route the 10mm flow
>> and return in it, then concrete back over the top.
>>
>> So the question is, do I need to protect my copper from the concrete
>> or will it be ok??
>>
>> Cheers
>
> Protect it without doubt.
>
> 1) Cement will attack it.
>
> 2) If the pipe wants to expand and contract it will eventually end up
> rubbing itself to death.
>
> The "old way" was wrap it in denso tape.
>
> You could (and I would) slide it inside a bit of plastic pipe.


> Plastic water pipe would be a good choice - it would allow a gentle
> bend for the pipe to come up both sides. You could even replace the
> pipe in the future if needed.

So why not just use plastic pipe in the first place:-)?

--
Adam

[dennis@home]

On 09/05/2013 18:10, Gordy wrote:

It needs protecting.
IIRC it will fit nicely inside some 15mm speedfit pipe.
You could just use speedfit.

[www.GymRatZ.co.uk]

On 09/05/2013 18:10, Gordy wrote:

> So the question is, do I need to protect my copper from the concrete or will
> it be ok??

+1 for sliding it inside round PVC conduit.
Where skirting level pipes weren't possible I've run 10mm Flow and
return all along the hall way in separate conduit.

Having seen the atrocious state of the pipework that it replaced (all be
it 40 years old stuff, wrapped in fibreglass loft insulation before
being screeded(sp) into the floor I would say complete mechanical
isolation was essential.

..... or you could get away with that plastic pipe stuff without worry
of corrosion or expansion.

Pete@

--
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[Dave Liquorice]

On Thu, 9 May 2013 19:19:27 +0100, ARW wrote:

>> Plastic water pipe would be a good choice - it would allow a gentle
>> bend for the pipe to come up both sides. You could even replace the
>> pipe in the future if needed.
>
> So why not just use plastic pipe in the first place:-)?

Expansion and contraction plastic is a lot softer than copper... And I
think plastic expands more than copper as well.

--
Cheers
Dave.

[polygonum]

How about plastic pipe with a wrapping of something like, umm, pipe
insulation? After all, the OP possibly doesn't want to lose heat from
the pipe into the concrete floor. (Depending on circumstances -
appreciate sometimes it would make no difference.)

--
Rod

[GMM]

On 09/05/2013 19:48, Dave Liquorice wrote:

On the other hand, each size of plastic pipe slips quite happily through
the size above, making a very convenient conduit and giving protection
and insulation (not that I've done this through a floor, only through
walls!)

[Tim Watts]

Then you couldn't replace it :)

[meow...@care2.com]

On Thursday, May 9, 2013 6:10:01 PM UTC+1, Gordy wrote:

> So the question is, do I need to protect my copper from the concrete or will
> it be ok??

concrete made with flyash attacks Cu, sand/opc doesn't. Long runs get into trouble with thermal expansion if not sleeved.

If ground floor, insulate it.


NT

[Rick Hughes]

On 09/05/2013 18:10, Gordy wrote:

wrap it in DENSO tape