Hi all - I have mould in our downstairs toilet. The wall doesn't feel damp, and gives a moisture reading of 20% where the mould is very slight, and 22% where it's most dense. Meanwhile outside the bricks are pretty damp and need repointing
I've had different perspectives from experts:
1. The mould and exterior damp are probably unrelated given how thick the wall is. I was advised to fit an extractor fan, see how it goes for 2-3 months and if the problem's not fixed then replace the damp proof course from the inside and then replaster with a damp proof type product
2. The mould and exterior damp are related. So, advised to just get straight to new damp proof course applied internally and then replaster with drytech system
3. The mould and exterior damp are related. The exterior damp has been caused by rain hitting above the current damp proof course as we've raised the ground level by putting the decking down. So, advised to insert damp proof injections above the decking from the exterior and then cover them with a concrete plinth
I'd rather attack the problem from the exterior in the hope that I then won't need to replaster and redecorate internally, but I've also read bad things on here about plinths. Would it be a terrible idea to:
- Insert damp proof injections per recommendation #3
- Repoint with breathable mortar rather than a plinth
- ...whilst using a dehumidifier inside, followed up with an extractor fan?
Thanks very much for your help
I've had different perspectives from experts:
1. The mould and exterior damp are probably unrelated given how thick the wall is. I was advised to fit an extractor fan, see how it goes for 2-3 months and if the problem's not fixed then replace the damp proof course from the inside and then replaster with a damp proof type product
2. The mould and exterior damp are related. So, advised to just get straight to new damp proof course applied internally and then replaster with drytech system
3. The mould and exterior damp are related. The exterior damp has been caused by rain hitting above the current damp proof course as we've raised the ground level by putting the decking down. So, advised to insert damp proof injections above the decking from the exterior and then cover them with a concrete plinth
I'd rather attack the problem from the exterior in the hope that I then won't need to replaster and redecorate internally, but I've also read bad things on here about plinths. Would it be a terrible idea to:
- Insert damp proof injections per recommendation #3
- Repoint with breathable mortar rather than a plinth
- ...whilst using a dehumidifier inside, followed up with an extractor fan?
Thanks very much for your help
