Damp patches in/around pollyfilla in wall

[HBee]

2 years ago when I moved in to my flat I pulled down some shelves from a wall in the spare bedroom, pollyfiila'd the holes then painted over. I used quick setting pollyfilla even though some of the holes were quite big, so possibly it didn't completely dry and set inside before I painted over. (stupid mistake)

All was fine until last winter. As it was never used I didn't heat the room and during the prolonged cold weather moisture entered the pollyfilla causing damp patches in the wall. I will try to post a photo.

To remove these should I cut out the pollyfilla and replaster, or is it sufficient to just cover over with a damp seal?

 

[madder]

To fix it properly, you'd be best off ripping out anything that is wet or damp, and replastering. Perhaps some foam insulation might help also.

Using damp proof paint would be a temporary fix only.

 

[HBee]

Pics below of the affected wall:

I've chiseled out one of the damp patches:

Should I now treat this with PVA?

Will pollyfilla then be sufficient to fill again, or does it need to be plastered?

 

[Bosswhite]

All you needed to do was whack a bit of oil based undercoat over the stains, and Emulsion the wall .

 

[madder]

That may very well work. But PVA or some anti damp anti fungal prime would have a better chance.

 

[HBee]

Ok then pollyfilla or plaster?

 

[Bosswhite]

Never PVA, and Emulsion over the top.

How big are the holes, I would guess polyfilla would do the job.

 

[joe-90]

Plasterers use PVA under a thin skim. Why don't you tell them 'never'?

 

[Bosswhite]

Plasterers use PVA under a thin skim. Why don't you tell them 'never'?

I thought Madder was suggesting PVA over the Top of the plaster, then emulsion paint

 

[joe-90]

I thought he meant to allow the filler to grip.

 

[madder]

Sorry, I should have been more clear. Grip of course