Plaster Issue

karlitob

Hi all,

Please see pics. Issues with peeling paint and a chalky residue from a corner of our room. We've had this checked - no damp, no leak, no nothing. This spot is where new skim plaster meets old wall. The paint went on without fully drying. I'm wondering if there is such a thing as too much lime in the plaster that is causing it to flake. Hope that makes sense.
Thanks for advice.

e.r

As you said in your post paint went on before fully dry. That's your issue moisture. Scrape off loose stuff and repaint

karlitob

e.r wrote: »

As you said in your post paint went on before fully dry. That's your issue moisture. Scrape off loose stuff and repaint

Thanks. A professional painted did this job. I scraped it off about two years ago and wanted to see what would happen. It flaked quite a lot and shaky residue fell on the floor and work surfaces for a long time (months) afterward.

Are there any issue with more lime in the plaster or anything like that that you are aware of.

getaroom

karlitob wrote: »

Thanks. A professional painted did this job. I scraped it off about two years ago and wanted to see what would happen. It flaked quite a lot and shaky residue fell on the floor and work surfaces for a long time (months) afterward.

Are there any issue with more lime in the plaster or anything like that that you are aware of.

No.

Scrape / sand off effected area and surrounding area. Coat with watered down polybond and repaint.

karlitob

getaroom wrote: »

No.

Scrape / sand off effected area and surrounding area. Coat with watered down polybond and repaint.

Thank you - what ration would you recommend. Do you recommend a brand of polybond?

getaroom

karlitob wrote: »

Thank you - what ration would you recommend. Do you recommend a brand of polybond?

depending on how bad the wall is. i usually put it on neat. others 50:50.

any hardware will have a tub of it. id buy larger buckets, but you can get small amts in woodies. any brand will do, its like kids glue. i always recommend coating all fresh skim coat with it before painting, as thin as you like. Paint / wall paper will stick to it,

karlitob

getaroom wrote: »

depending on how bad the wall is. i usually put it on neat. others 50:50.

any hardware will have a tub of it. id buy larger buckets, but you can get small amts in woodies. any brand will do, its like kids glue. i always recommend coating all fresh skim coat with it before painting, as thin as you like. Paint / wall paper will stick to it,

Thanks for the advice. Any idea why the plaster stripped away like this in the first place. Its caused a lot of stress that there may have been a leak! No damp. No leaks. Just can't figure out why it happened.

RustyNut

karlitob wrote: »

Thanks for the advice. Any idea why the plaster stripped away like this in the first place. Its caused a lot of stress that there may have been a leak! No damp. No leaks. Just can't figure out why it happened.

Looks like Efflorescence to me.

getaroom

Could be the coldest part of the room. Last part to dry. If there is damp penetration it will reemerge in the area outside the polybond.

I wouldn't worry about it. Does the room have ventilation?

karlitob

getaroom wrote: »

Could be the coldest part of the room. Last part to dry. If there is damp penetration it will reemerge in the area outside the polybond.

I wouldn't worry about it. Does the room have ventilation?

Its nearly the coldest part. This is the part where the a flat roof extension meets the house. On the exterior there is (was) an alcove where the external insulation was absent due to toilet downpipe. And we used the heat/fire a lot in the first year we were in the house. I genuinely don't think there is any damp. I've tried and checked everything. Bone dry on the flat roof. No discolouration, smell, water etc from the downpipe which isn't even near. No other water near or at that place but I do know it can travel from other places.

Yes the room has ventilation - its a large kitchen/diner/sitting room so doors open lots etc.

Would the following make a difference - its new plaster skimmed over old ?lime plaster. This is the point where the two meet!

To polybond or not to polybond?

getaroom

always polybond ---- its only a few euro.