advice sought - builder's idea for damp proofing a basement

Why not ask your local friendly BCO? They are normally very helpful (not like planners who often hail from other planets) Bob

Sir

There are special membranes for this sort of application, they fix between the wall and the wallboard, and allow the water to run down the gap, and be removed from the bottom.

The aquaseal may well work, it depends on how good a job you want .....

Rick

Not a hope. You need a proper system that will isolate the room from the wall touching the wall, draining all water down and out. Not cheap but anything else will decay quite quickly. In this case the Aquaseal will most likely cause the wall to get damper and damper until the dampness either breaks through or begins to destroy the wall itself.

Asphalt floor waterproof ok. Other treatments depends on how bad the damp e.g. worst case possibility of water accumulating behind wall so that it runs in through cracks, best case - the ground may already be well drained and only need a light treatment inside to keep dry. In the worst case it needs the ultimate solution; tanking - asphalt on wall also, held in place by solid brick/block/concrete inner wall. A middle road is to apply dense cement render+waterproofer roughly cast onto cleaned up walls amd then rendered over as normal. It all depends

cheers

Jacob

I'm thinking a dehumidifier would be the cheapest option, if thats what youre looking for.

Question for those that may know: must tanking be on the outside of the wall, or is it quite qworkable to waterproof the inside? I'm thinking of wall deterioration and possible freezing while wet.

Regards, NT

My reseach suggests that on the outside the water pushes the tanking onto the wall, and on the inside it pushes it off.

Rick

Yup. Thinking about my prime question, I guess the answer is that if you can tank on the outside you do, but once its built one can only tank the interior, so you do. AFAIK tar is the longest lasting tanking.

Regards, NT