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Quite unconnected with my big leak, I have a smaller leak I need help with

(22 Posts)
KatyMac Mon 12-Nov-12 16:15:08

My big leak happened last Wednesday & is unconnected with my smaller leak which appeared as a damp patch about 3 weeks ago

It is close to where a pipe goes through the wall, but both sides of the pipe is dry.

Is it likely that the pipe has split within the wall?

PigletJohn Mon 12-Nov-12 20:42:15

not very likely.

is it a cold pipe in a warm room?


is it a pipe passing into a rainy area?


KatyMac Mon 12-Nov-12 21:02:29

It used to be an external wall - now it's inside the conservatory

The conservatory floor has underfloor heating

The pipe is the utility sink drain which comes through the wall & joins the main water out of the house pipe about 2m further on

Thanks for answering PigletJohn; you have given me such good advise (esp last week)

PigletJohn Mon 12-Nov-12 21:47:07

it's a plastic pipe?

does it seem to be under any bending force, or will it wiggle freely?

KatyMac Mon 12-Nov-12 22:00:31

It's rigid plastic - there is a joint either side

My dad is flumoxed - he spent years as a building contractor but has been management for decades

I wonder if the cladding/outside finish has come away from the wall & water is getting in. It was one of those only halfway up the wall thick coating painted cream, then plastered over once it was inside

KatyMac Mon 12-Nov-12 22:00:51

It is cemented/mortored in

PigletJohn Tue 13-Nov-12 12:25:19

it is possible, but quite difficult, to crack a uPVC pipe, mostly by a heavy object falling on and stressing it. The crack is more likely to be at the edge of the wall than inside it. It would be abnormal to have a joint in a pipe inside the wall.

If it is a cavity wall, it might be that water is entering the cavity from above, perhaps from a defective roof or gutter, very rarely from a plumbing leak, and dripping onto the pipe, or filling up the cavity and leaking out of the hole round the pipe.

KatyMac Tue 13-Nov-12 18:18:16

Could it be either cold bridge condensation

or that the pipe gets condensation round it with in the wall

& then we put the heating on?

PigletJohn Tue 13-Nov-12 22:06:50

Metal pipes often get condensation, plastic pipes don't.

What runs through it?

Is the wall damp?

KatyMac Tue 13-Nov-12 22:13:18

The plastic one has waste from a utility sink - so washing craft stuff, hands, cleaning etc

The metal one about 10 inches to the left has premixed warm water for the children's sink

PigletJohn Tue 13-Nov-12 22:18:02

Might the metal pipe be leaking or getting condensation when cold?

Leaks are more common at joints but water may run down or along the pipe

Is there a wet window above?

KatyMac Tue 13-Nov-12 22:19:29

No window above

The damp patch is about 2 foot from the metal pipe & above it

PigletJohn Tue 13-Nov-12 22:19:37

Tie kitchen roll tightly round all pipes on both sides of the wall.

KatyMac Tue 13-Nov-12 22:20:29

Sorry that isn't true there is a window above the metal pipe but it's an internal window between the utility & the children's toilet

KatyMac Tue 13-Nov-12 22:21:14

I'll try that tomorrow - good idea

PigletJohn Tue 13-Nov-12 22:32:55

Is condensation or rain coming from the window? Is it a cavity wall (13 inches thick) or a solid wall (9 inches)?

KatyMac Tue 13-Nov-12 22:34:51

13 I think; it's a 1950s ex council house - so I expect so

The window is between 2 rooms so it sees no rain and no condensation

PigletJohn Tue 13-Nov-12 22:43:14

Is there a flat roof above this wall? Might. there be an old water pipe chased into it and plastered over?

KatyMac Tue 13-Nov-12 22:44:55

Nope - it's the rear elevation of the house - normal roof

My dad is tearing his hair out tbh he cannot 'find' a reason

KatyMac Tue 13-Nov-12 22:45:39

There is obviously a conservatory roof over it but I'm kinda hoping that's OK as there is no visible water

PigletJohn Tue 13-Nov-12 22:57:52

Is it worse in rainy weather, or better after a day when the sink has not been used?

When did it start happening? I would be thinking of chipping some plaster off to look at the bricks. It might be hydroscopic salts from old damp.

KatyMac Tue 13-Nov-12 23:00:02

I'll track it over the next few days

It started about when the temp dropped & I put the heating on (I think)

Chipping off is all we can think of to do - thanks

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