Damp proofing exterior walls.

[artie]

Since fitting the new roof on my "shop", It is more pleasurable going out to work. But as is usual when you fix one thing it shows up something else.

It's been done for over a month now and I have not seen condensation or a leak since, the walls are almost completely dried out, but I have noticed after heavy rain there are little spots of damp below one of the windows.

It's not coming in through the window since it just appears out of the wall a foot or so below the window.

I was wondering if a spray on water proofer is available. I have searched of course and can find plenty for brick walls. Mine is what we call pebble dashed around here, on the out side and I haven't seen any spray recommended for that.

 

[blackrodd]

I Presuming you're window cill isn't cracked or damaged and the drip groove is clear and working.
Either paint the pebble dash with masonry paint, or thompsons water seal, which is clear.
https://www.google.co.uk/webhp?sourceid ... r&tbm=shop

If its a non cavity wall then allow a 9" or 10" plinth unpainted at the bottom allow the wall to breathe, or you could drive moisture up the wall inside.
Rodders

 

[Hemsby]

+1 for Thompsons Water Seal

 

[artie]

I Presuming you're window cill isn't cracked or damaged and the drip groove is clear and working.
Either paint the pebble dash with masonry paint, or thompsons water seal, which is clear.
https://www.google.co.uk/webhp?sourceid ... r&tbm=shop

If its a non cavity wall then allow a 9" or 10" plinth unpainted at the bottom allow the wall to breathe, or you could drive moisture up the wall inside.
Rodders

The sill was cracked and pitted but I filled it up and smoothed it. I like the idea of the clear stuff. There is a 12" or so undashed area at the bottom of the wall, so if I didn't seal that it would probably be ok.

 

[Beau]

Another one for Thompsons water seal. My single skinned block workshop walls leaked like a sieve before treatment and are now pretty good. Does need recoating after a few years. You say the water appears a foot below the window. This does sound like the window/wall interface leaking. The water will track down as well as in so often water shows below the points of penetration.

 

[Phil Pascoe]

You'll probably find out quickly enough (if it's a solid wall) if the ingress is near or because of the cill when you waterproof the outside. It'll still come through.

 

[artie]

Thompsons Water Seal it is then.

Thank you all.

 

[woodfarmer]

again Thompsons. use a paraffin gun to spray it. easy peasy.

 

[Phil Pascoe]

There are of course others that are equally as good.

 

[artie]

There are of course others that are equally as good.

But not better. ?

 

[Phil Pascoe]

Maybe not better - but possibly cheaper.

 

[artie]

Maybe not better - but possibly cheaper.

Being of Scots Irish origins, cheaper always appeals.

Can you suggest one equally as good at a better price.?

 

[Phil Pascoe]

Research brands like "Everbuild" - they make consistently decent quality stuff at better prices than most (for one).

 

[Mark A]

Wickes do a version. Like all things it seems to have increased in price by 150% since I last used it, however.

 

[Phil Pascoe]

That's the money the government prints not making any difference to anyone.

 

[RobinBHM]

Sadly Thomson's is not as good as it used to be, now it has become solvent free. I find it is not easy to get it to penetrate, it tends to want to run off.

The best waterproofer is this: https://www.promain.co.uk/product/liqui ... 501-id3202 which will make the Thomsons seem very reasonable!