Leak - Ceiling Level - Width of the Room

[Georgie73]

I've got a strange situation going on. I have a leak which is appearing the full length of a bedroom wall - the leak is at Ceiling level and it is running down the wall. Originally the water was coming in from the flank wall. The roofer noticed damage - cement under the tiles had eroded. This was repaired and has dried out. However the leak has re-appeared about a week later in the same room but the adjacent wall. The roofer can't find any damage. The guttering is sound, the roof is sound there is no evidence of water coming in (it wasn't even raining when it started leaking again). The roofer believed it must be an internal pipe.

The plumber has been out and he has traced all the pipes in the loft - everything is bone dry and no evidence of a leak - not even an old one.

The plumber has suggested the water might be collecting somewhere and then filling over every now and again - but where and how could it be collecting?

Any ideas?

 

[^woody^]

Can't you look in the loft to see if the wall above the ceiling and below the roof is damp?

Pictures of the internal and external would help describe things

 

[Georgie73]

Thanks. Everything is bone dry in the loft.

I've got pictures inside but didn't think to take any of the outside.

 

[^woody^]

The way that moisture is on the surface and the pattern, looks a lot like surface condensation. Is there insulation above?

 

[Georgie73]

There is insulation in the loft. It is bone dry.

The water came pouring in and was running down the walls. I have been doing some googling and I have a feeling that water is somehow getting into the cavity and then overflowing.

 

[^woody^]

Post some external images, and if need be a google satelite view with the location details croped out.

 

[Georgie73]

Haven't had a chance to do this yet. Things are progressing - it's happening in the next house along too. My roofer said their gutters need a really good clean and he thinks that realigning the guttering will help. We share the same down pipe, so its a possibility.

 

[Mw Roofline]

Perhaps refelt a metre up and combining it with some vented eaves trays

 

[scruffybiker]

I bet its condensation...I had the exact same thing in my back bedroom...turns out there was literally no insulation in the eaves...put some in there hey presto.