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Flyboytim thank you so much for your reply. There have been so many problems with that wall that I almost can't count. It's a cavity wall of unknown age facing south-west in a house of numerous botched-up jobs. We will make some investigations of the kinds you have recommended and we...

do you need an undercoat? what do you recommend for that?

thanks, John, your advice is much appreciated. We are having a lot of trouble with a cavity wall that is facing the weather. The previous owners have applied a thin coating of some weird material that has not really bonded with the cement render underneath. So, we want to sand-blast that...

thanks, John, I looked this up and it really looks interesting. but there are other sealants that make similar claims and are cheaper. Do you have experience with this? What are your reasons?

Hi all I need to know what is the best weather sealant for penetrating damp to put on an outside wall. My builder recommended dulux weathershield with johnson weatherproof on top. But there are so many 'amazing' products on the market and I want to find the best one. Any recommandations?

we had what we thought was rising damp in a corner. but on further investigation it turned out that there was a 'hole' in the cavity insulation, which created a cold spot and the 'rising damp' was actually condensation. We filled the cavity with polystyrene pellets. If it is really rising...

just what a number of builders adviced. I just a builder here and he said - try painting with some sort of weather sealant and he'd bet that will cure it. The other builder who did the flashing on the conservatory said the same thing. So we are probably going that way. If that does not work...

nobody knows when the brickwall was build - it could be quite old. the damp is internally on a wall that faces externally.

the wall was probably a cobwall but now is entirely made of bricks with a cavity. the other 3 walls of the house are still cob and have no damp problem. The damp problems are internal with brown and grey wet patches and plaster busting open and paint peeling in places.

What door frame? To which room? It's the door between lounge in the house and the abutting conservatory in the exterior wall Where is this in relation to the exterior walls? Where are the damp patches most prevelent? actually everywhere. Upstairs is a window and there is damp patch...

We have a very difficult wall with numerous damp issues. Threre numerous brown and grey wet spots showing in the house and paint and plaster gets cracked in places. There is also water dripping out of door frame and a window frame where water has gone into the cavity. It's a cavity wall and...