copper pipes in the wall

[dotto]

Hi all.
A friend is doing his bathroom and wants to run the wash basin cold and hot water pipes and discharge pipe into the solid wall, plaster over and out into the existing hopper before tiling the wall.My questions are
1) when you run the h&c water copper pipes from the tap and straight into the wall, do you then pull manual bends wherever needed or are there points in the wall where it is better to use end feed elbow fittings?
2) are you allowed to use end feed fittings at all or is it advisable not to use fittings?
3) do you cover the pipes with insulation tape or is it better to use a 20 mm. plastic pipe to protect the copper pipes and to allow for linear expansion?
4) if you use plastic pipes to protect the copper, how do you prevent the plaster from running into the plastc pipes when you plaster over?
5) copper pipes sweat, so will they cause any damage to the wall over time?
6)when you run the discharge pipe into the wall, do you go then straight down the wall then give it a gentle fall and out into the hopper or into the wall, then gentle fall first then straight down before going out into the hopper or it does not matter either way?
Thank you very much for your time.

 

[Softus]

A friend is doing his bathroom and wants to run the wash basin cold and hot water pipes and discharge pipe into the solid wall, plaster over and out into the existing hopper before tiling the wall.

Oh dear.

1) when you run the h&c water copper pipes from the tap and straight into the wall, do you then pull manual bends wherever needed or are there points in the wall where it is better to use end feed elbow fittings?

No.

2) are you allowed to use end feed fittings at all or is it advisable not to use fittings?

It's advisable not to do what your 'friend' is thinking of doing.

3) do you cover the pipes with insulation tape...

No.

...or is it better to use a 20 mm. plastic pipe to protect the copper pipes ...

Yes.

...and to allow for linear expansion?

Eh?

4) if you use plastic pipes to protect the copper, how do you prevent the plaster from running into the plastc pipes when you plaster over?

Don't bury the pipes in the wall. This will achieve the not letting plaster run into the pipe effect that you wish for.

5) copper pipes sweat, so will they cause any damage to the wall over time?

Sweat? Aren't you thinking of testacles?

6)when you run the discharge pipe into the wall, do you go then straight down the wall then give it a gentle fall and out into the hopper or into the wall, then gentle fall first then straight down before going out into the hopper or it does not matter either way?

There's no general rule - do what's prettiest and then make the falls correct.

 

[ChrisR]

Yes let the pipes move.
They only sweat if damp warm air gets to a cold pipe.
Plaster doesn't attack copper, but cement juice does.
I use expanding builders foam a lot. The fireproof ones from the reusable guns don't expand so much and can be laid precisely.
Some use hairfelt to keep plaster off thepipe, but a blob of stiff Bonding at the end of an oveflow-pipe conduit doesn't seem to give problems.

 

[gas4you]

Is there now some legislation stating the miniumum distance between hot & cold pipes in walls due to legionella risks etc

 

[wonderb0y]

if he does as suggested and covers the pipe either in bigger plastic pipe or conduit then their shouldn't be a problem of any risks.

i usually do as chris said cover pipe in conduit or lager pipe and cover in expanding foam then just plaster of fill over that.

 

[dotto]

Yes let the pipes move.
They only sweat if damp warm air gets to a cold pipe.
Plaster doesn't attack copper, but cement juice does.
I use expanding builders foam a lot. The fireproof ones from the reusable guns don't expand so much and can be laid precisely.
Some use hairfelt to keep plaster off thepipe, but a blob of stiff Bonding at the end of an oveflow-pipe conduit doesn't seem to give problems.

Hi Chris and thanks 4 answering.
1)When running pipes in the wall, is there a place where you would rather use end feeding fittings to manual pipe bending?
2)What kind of flexible plastic pipes do you use to fit over the copper pipes so that the plastic pipes would fit over the bends of the copper pipes?
3) When running plastic discharge pipe into the wall and plaster over, do you allow for expansion of discharge pipe? and how? Thanks for your time.

 

[kevplumb]

1)When running pipes in the wall, is there a place where you would rather use end feeding fittings to manual pipe bending?

DON'T bury fittings it's a recipie for disaster

 

[doitall]

If you want to apply the letter of the law (water regs) potable, hot and cold water pipes have to be ducted, plastering them in is not allowed.

 

[Softus]

DON'T bury fittings it's a recipie for disaster

Just add water and heat slowly until it starts to bubble...

 

[dotto]

1)When running pipes in the wall, is there a place where you would rather use end feeding fittings to manual pipe bending?

DON'T bury fittings it's a recipie for disaster

Thanks guys.