I recently had a new gas boiler fitted. When they were doing it, the
chaps agreed to chase out the plaster and run part of the pipework in
the dry-lined wall, so that I can cover over it later and don't get
ugly pipes/boxing running down the wall. When they did it, they
wrapped the gas pipe in yellow tape down the entire length that will
be buried. I'm not entirely sure why they did this, my guess is so
that the copper doesn't react with the plaster when the channel is
I now need to do something similar with water pipes. The questions is
do I need to do the same thing, i.e. wrap them in tape where they will
be buried? Also is there a particular kind/colour of tape I should
use for a water pipe?
To my eyes, the stuff they used for the gas pipe looks just like
electrical insulation tape.
I think you will find that yellow is an identifier for a gas feed pipe as
green is for oil.
On Thu, 16 Apr 2009 10:47:19 +0100, Trevor Smith wrote:
Yellow for gas and blue for cold water are fairly standard but green I've
not seen for oil, the plastic coated pipe for (domestic) oil pipes is
white. Green in the ground is telecommunications as in cable TV...
On Fri, 17 Apr 2009 02:43:28 +0100, Trevor Smith wrote:
I wouldn't rely to hard on that info. I'm reasonably sure a shade of green
is something to do with hot water, can't remember if it's flow of a
primary circuit or domestic hot water (the stuff that comes out of taps).
I get the feeling it's one of those things where there are many
"standards" depending on context, in buildings or under ground etc.
Dunno about gas, but water pipes, especially HOT water pipes, should be
sleeved with something. Best is slip on foam insulation. Then taped up.
Otherise you have two or three potential problems.
1/. expansion and contraction will cause creaks against wooden studding,
and may in fact split plaster laid over.
2/. incoming cold mains water is enough to lower the temp of the pipe,
and if not thermally and to an extent vapour barriered, may cause
condensation on the pipe when the air is steamy and warm. Add that to
plaster, and you have a recipe for corresion.
3/. Its already easy enough to drill through pipes in walls etc. Adding
an inch of foam at least gives a BIT of warning :-)
Hover I am confused. A dry lined wall is not generally full of plaster..?
If you are running water pipes in studwork, you can insulate or not
really. In internal walls CH pipes just heat the house anyway, or if you
have insulation behind the studwork on an external wall, then the pipes
should be surrounded by that anyway Although plastic foam never goes amiss.
It's not a feed pipe, it's between the meter and the boiler. The only
part of the pipe that is taped is where it will be buried in the wall,
hence the reason I assumed it was done to protect it from any plaster/
filler, but I could be wrong, there could be another reason why
they've done it.
No, the wall is dry-lined, with 1 inch thick polystyrene then boarded
over, but it now has a 2 inch wide channel running down it with a gas
pipe in it.
I think the easiest way of making good is just to fill that section
with plaster/filler, it is only a gas pipe so expansion/contraction
shouldn't be a problem.
I do take note of that point in relation to the water pipes though, so
I think I will cover it with foam insulation.
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