curing mildew on a north facing wall

[DIYedboy]

I get sweating then mildew forming on the wall beneath my upstairs bay window (typical 1930's build). My girlfriend remembers the same happening in her old house. All I can think to solve the problem is to line with thermal plasterboard. She tells me ' where I lived, we stripped off the plaster and a plasterer told us to dilute a liquid (looked similar to semen apparently) with water then paint on the wall' when it had dried the plasterer came round and plastered over it and the condensation problem never returned.

Learned plasterer's.............what is this magical liquid?

 

[marshman]

I think she's muddle over the use of pva, but I could be wrong.

 

[roughcaster]

I get sweating then mildew forming on the wall beneath my upstairs bay window (typical 1930's build). My girlfriend remembers the same happening in her old house. All I can think to solve the problem is to line with thermal plasterboard. She tells me ' where I lived, we stripped off the plaster and a plasterer told us to dilute a liquid (looked similar to semen apparently) with water then paint on the wall' when it had dried the plasterer came round and plastered over it and the condensation problem never returned.

Learned plasterer's.............

what is this magical liquid?

Ahhhh,, now that'll be Merlin's Mutton known in the trade as good old diluted PVA.

 

[marshman]

[/quote]

Ahhhh,, now that'll be Merlin's Mutton [/quote]

 

[Richard C]

I think she's muddle over the use of pva, but I could be wrong.

“Good old PVA” was water soluble, although you can now get a waterproof variety; what’s the difference between it & SBR then So perhaps it was --- errm, what she thought it looked like ------- someone elses "mutton", who knows

I don’t see how either PVA or SBR will get rid of condensation; curing the "cold spot" & good ventillation will take care of that; SBR will certainly help with mild damp ingress but my guess is it probably wasn’t just straight plaster he put on there either; & just how long is never

 

[DIYedboy]

She thinks it could have been some sort of PVA..........but let's face it, that isn't going to stop a cold spot n recurring condensation and therefore mildew.............is it?

 

[DIYedboy]

She lived in the house for a further 15years with no recurrance, even if the plasterer had used sand n cement with siraphite over that, it wou;dn't solve the problem would it?