Painted over plastered walls which seemed dry but now have wet patches

Astrozombies

It is advised by BG etc... to apply pva on old plasterboards. Maybe the plasterer was using up old stock.

Jeepers_Creepers

Who is BG?

That just doesn't make any sense to me.

I cannot think of any circumstance where plasterboard - PLASTERBOARD, which is designed for skimming - requires a coat of PVA. Even if the twit fitted the boards the wrong way around, they could still skim on to it straight-off.

fenwick458

British gypsum i'm guessing.
seems odd though, how old would a plasterboard have to be before it becomes unstable? I've never heard of it....It sounds like something thats come from the PVA advertising board!
in answer to the OP, how long have these wet patches in the corner been wet? i'd be tempted to just heat and ventilate the room properly for a full day, if the problem persists, you have a problem,. if they problem goes away, then you don't t have a problem.

Brigmeister30

fenwick458 said:

British gypsum i'm guessing.
seems odd though, how old would a plasterboard have to be before it becomes unstable? I've never heard of it....It sounds like something thats come from the PVA advertising board!
in answer to the OP, how long have these wet patches in the corner been wet? i'd be tempted to just heat and ventilate the room properly for a full day, if the problem persists, you have a problem,. if they problem goes away, then you don't t have a problem.

fenwick458 said:

British gypsum i'm guessing.
seems odd though, how old would a plasterboard have to be before it becomes unstable? I've never heard of it....It sounds like something thats come from the PVA advertising board!
in answer to the OP, how long have these wet patches in the corner been wet? i'd be tempted to just heat and ventilate the room properly for a full day, if the problem persists, you have a problem,. if they problem goes away, then you don't t have a problem.

The wet patches have gone now thank you! Heating and i think it was dot and dabbing patches as they were very equal?

Brigmeister30

The room in question was a full replaster taken back to brick it was the ceiling plaster they did which came away

Jeepers_Creepers

The ceiling? Blimey - why was that? They won't have D&Ded the ceiling, surely?!

Pleased it's sorted, tho'.

Brigmeister30

Jeepers_Creepers said:

The ceiling? Blimey - why was that? They won't have D&Ded the ceiling, surely?!

Pleased it's sorted, tho'.

No idea! He tried to blame us for not having heating 24/7 who knows 🙈 no don’t think the ceiling was dot and dabbed tbh but i’m no expert i just know it came away and i panicked but all resolved thanks!

Jeepers_Creepers

Ah, was it right in the corner betwixt the ceiling and walls? They'd have run a large, possibly continuous, dab along there to fully secure the board edges.

Also, corners like that are the last to dry out as reduced airflow.