Damp patch. Help!

[Ianbo]

Hi
So, about 18 months ago I noticed some damp coming from behind a radiator in our downstairs toilet.

The house is 3 years old.

The damp didn't get any worse for 12 months, but it didn't dry up either, so to be honest, I just ignored it.

We've had a bit of rain recently, not much though, after a heatwave in the UK, and it does seem to have gotten worse.

We don't lose water pressure, and the fact that it seems to have gotten a bit worse after rain, says to me that we don't have a water leak. The water must be getting in some how.

Can any one offer and advice on what I should do to trace where the water is coming Grimm and how to rectify it or whether I need a plumber or other tradesman to look at it.

Thanks

 

[foxhole]

Whats behind the wall a photo would be helpful.

 

[Ianbo]

What do you mean behind the wall? I provided 3 pictures of the wall... do you mean the other side of the wall? As in the external wall? If that's what you mean, see attached

 

[KenGMac]

Ianbo, good evening.

Odd but? from the last image you posted, the DPC is two brick courses below the weep hole [the vertical plastic insert] immediately above the air brick, the DPC is the just visible protruding horizontal black line.

I cannot see why the cavity weep is so far above the DPC?

Is the floor in the affected room a concrete slab or a suspended timber floor, I suspect the latter given the air brick.

Ken

 

[Ianbo]

It's a tiled floor, through from the kitchen... the kitchen flows through the downstairs hall in to the downstairs toilet... comparing the height of the toilet floor to the outside floor I wouldn't say it was raised

 

[Ianbo]

On the last pic I posted of the outside wall, to the very left, cut off by the pic is a vertical vent, that is just about centre to the radiator in inside.
My wife took the external pic and she didn't quite get the position right

 

[jj4091]

Surely on a 3 year old house you need to contact the builder. You should have a warranty.

 

[Charlie George]

Cavity trays do go above airbrick, is that another weep vent to the left of picture ?. But as said above get builder to sort it.
Jim

 

[foxhole]

If rain get in the weep holes in could be carried across to the inner if the vent is a periscope type .