Burying copper in plaster ?

[andysideas]

Where can I see this tape you all refer to. ?

I searched screwfix for DENSO ?

[Matthew]

Hi,

We live in a 70's house with copper pipes in the solid floor. When we moved in we found a damp problem on one wall. When I dug the floor up I found one of the copper joints buried in the floor weeping. Probably been doing that for years. Its sometimes better to use compression fittings with floor buried pipe. I also covered them in the wool type lagging before reconcreting. If the plumbing and soldering is of a good quality then there shouldnt be a problem. Ive been to jobs in the past and come across copper plumbing that simply using a sharp tug a soldered joint has come apart. How on earth they were not leaking I dont know...

Matthew

[Doctor Drivel]

It isn't DO NOT use compression in buried pipe.

Modern fluxes ensure a good joint these days.

[<me9]

With minimal skills soldered joints should be reliable, they are the only ones allowed in enclosed spaces for gas, and I can't remember ever having one of mine fail. I would *never* bury a compression fitting, they have a tendency (unless done with ptfe/jointing paste) to weep ever so slightly.

[Rob Morley]

I thought that was supposed to be extremely inadvisable.

[Frank Erskine]

[The Natural Philosopher]

Indeed. A bit ofcfloor expansion will rip it off. Best to use plastic pipe...

[Grimly Curmudgeon]

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Dave Fawthrop saying something like:

There is some noticeably thinner stuff around though. BS it might be, but it's right on the edge of it.

I'd certainly not leave it in place unprotected.

[jim_in_sussex]

yes there are different grades of copper tube: the common varieties being annealed or half-hard; & Table letter ( W, X or Y). The table letters refer to Tables in a British Standard.

SFAIUI:

Table Y has the thickest standard wall thickness, but (again, SFAIUI) this is manufacturer dependant and tube is available with a much thicker wall. Underground you require annealed with a thick wall. For high temperature or high pressure, a thicker wall. Normal internal domestic plumbing uses half hard table Y, which is the normal type sold by B&Q.

see

[Frank Erskine]

Table 10 regarding the spacing of clips!

Thanks.