Rising Damp

[superal]

I have been and viewed the DIY forum where the problem of flaking paint at base of the house rendered walls is talked about. What I did not see mentioned was treating with a silicon solution before repainting . Has anyone tried this and was it effective ?.

[NeverSure]

Careful. I don't know what you're talking about. Is there an existing process for this? My experience with silicone is that paint won't stick to it. It actively repels paint creating "fish eyes".

Are you sure this can be done?

[superal]

Careful. I don't know what you're talking about. Is there an existing process for this? My experience with silicone is that paint won't stick to it. It actively repels paint creating "fish eyes".

Are you sure this can be done?

Fis.jpg

I used this method on the boundary walls ( typical Thai house wall ) but only on the top because it was always getting stained by tree leafs and became dirty very quickly . I was able to wash/wipe off most dirt/stains however I did not try it on a vertical wall , so now you have me thinking . On a section within our restaurant with the same problem I had the flaking paint render covered by tiles and it seems to have done the trick but this is only an area that is 8 inches high and the area outside is well over a foot . I have previously scraped the flaking off and repainted which is good for dry season but when the rains come I slowly see the paintwork start to flake .

Many thanks for your reply

[eyecatcher]

Silicone sealing and rising damp are poles apart.

One will not stop the other EVER.

Rising damp comes from the ground and to stop this you need a physical membrane...bituthene polyeth etc. Or an injected silicone barrier.

The water seal silicones are for penetrating damp such as wind driven rain. They will not stop rising damp as the problem is behind the structure.

The idea of silicone is to repel/reject water based products such as rain and emulsion so if paint doesnt stick its working well.

Hint......silicone after tge wall is painted.

Another tip is to try to use a solvent based silicone...the ones that smell. I have read that companies who made these silicones such ad Thompsons have changed from solvent based silicones to water based due to pressure from the save the environment loonies but the result is that they are now crap and useless.

Final word....if you think you have a problem....and happy that the render has dried out 100pc; paint it THEN seal it not tother way round

[stoneyboy]

[eyecatcher]

ImageUploadedByThaivisa Connect1451749696.433819.jpg

Oh Mr Rigsby...........oooooh Miss Jones

Brits only humour.

[superal]

Silicone sealing and rising damp are poles apart.

One will not stop the other EVER.

Rising damp comes from the ground and to stop this you need a physical membrane...bituthene polyeth etc. Or an injected silicone barrier.

The water seal silicones are for penetrating damp such as wind driven rain. They will not stop rising damp as the problem is behind the structure.

The idea of silicone is to repel/reject water based products such as rain and emulsion so if paint doesnt stick its working well.

Hint......silicone after tge wall is painted.

Another tip is to try to use a solvent based silicone...the ones that smell. I have read that companies who made these silicones such ad Thompsons have changed from solvent based silicones to water based due to pressure from the save the environment loonies but the result is that they are now crap and useless.

Final word....if you think you have a problem....and happy that the render has dried out 100pc; paint it THEN seal it not tother way round

Many thanks for your reply .

Hope I was not too confusing earlier , Originally I applied silicon over the finished emulsion on top of the wall but after a couple of years the weather took its toll leaving areas that could not be cleaned . So I painted over the top of the silicon and it took ok .

So you say after the walls are dried out paint first , silicon after . Will this give a protective holding together coat and stop the general flaking , sounds feasible .

[Chuckles78]

This is happening at my house, only on this section of the wall.

Can anything else be done to fix it for good?

[eyecatcher]

Looks like a swimming pool.. the wall is stained due to splashes of water. Its getting behind the paint and forcing it off.

Simple answer.....same as we do in a kitchen and a bathroom and indeed your pool.

Tile it. Problem sorts itself.

[Familyonthemove]

I was just looking at a friends new house during construction - and I noticed there was no damp proof course (DPC). I've not seen European/US type DPC's being used in Thailand, which may be why there's so much rising damp.

Normal practice in damp, Northern climates is to put a membrane between one course of bricks/blocks to stop the rising damp from the floor slab.

Alternatives are injected silicone using a special machine to force the damp proofing fluid into the bricks, or waterproof (fired) 'engineering' bricks with mortar treated to be water resistant.

Once the plaster gets damp, it will never dry out due to the salts. Need to strip off the plaster from the lower section of wall, proof the wall, then re-plaster with water resistant rendering.

[roo860]

ImageUploadedByThaivisa Connect1451749696.433819.jpg

Oh Miss Jones!!

Classic.

[KittenKong]

Looks like a swimming pool.. the wall is stained due to splashes of water. Its getting behind the paint and forcing it off.

Simple answer.....same as we do in a kitchen and a bathroom and indeed your pool.

Tile it. Problem sorts itself.

I used to live in an old farmhouse in Europe so I know a bit about rising damp. We had 1m of it in every wall.

I think the damp shown is mostly coming from the ground via that area of cobbles. Water splashes into the cobbles (which may be a badly laid drain that never properly empties) and from there it soaks up into the wall, pushing the paint off.

If so tiling wont cure this: in fact the tiles will just drop off.

If the damp is not a problem inside the wall then I would just line the outside of the wall with something that doesnt actually touch it, to allow natural ventilation. Some sort of wooden slatted frame for example.

Obviously the OP would only need the bottom couple of feet done like this. It would look quite smart against the cobbles and will hide the ugly peeling paint.

If the damp is also causing a problem inside the wall then the only real answer (apart from some other sort of covering layer on the inside wall) will be some sort of physical membrane across the base of the wall. The injected solutions work well enough when done properly.