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mecbe2

08:15AM | 08/10/08
Member Since: 08/09/08
1 lifetime posts
Bvbrush
If this was wood I wood call an exterminator..but it is my plaster turning to powder on most of wall in dining room on south wall of house. It started at the baseboard and is growing up like a disease. No water near..I have a new roof also new windows on that wall.Our house is 100 + years old it has brick insulation. Anyone have an idea what's up. The windows "2 double hung" were in bad shape real old. Perhaps water may have leaked in slowly and destroyed the integrity of the plaster. I just want to make sure there isn't something else. My guess is to cut out all the plaster and replace it..but I am only a blond..what do I know.

5slb6

02:22AM | 08/11/08
Member Since: 07/28/02
1356 lifetime posts
It sounds as if the plaster has gotten wet enough over the years to cause it to crumble, and if you have corrected the moisture problem then you can go about fixing it. The bad plaster will need to be removed and replaced with new.

rhinoshield

11:37AM | 10/19/08
Member Since: 10/07/08
8 lifetime posts
If the plaster is turning to powder it is from moisture. It's possible the damage occured slowly and the paint over the surface hid it for some time. It sounds like any water intrusion has been corrected. As far as repairing it, one thing I stronly recommend is atfer the bad plaster is removed, seal the edge of the old plaster left behind with an oil primer, not a water based one. Plaster when wet or drywall mud will only put water back onto the old edge of the remaing plaster. This will cause a crack along the repair line from softening the plaster along the repair. If there are any other places where the plaster is exposed seal those spots with oil primer also.

It is possible the walls hav eoil base paint on them. To check for this use rubbing alcohol. If the paint softens when you rub on it then it's latex paint. If it doesn't get sticky or soften from the alcohol then it's oil. If you plan to repaint with latex paint and there is oil paint on the wall now, you will need to prime the wall first. Oil can go over latex but latex cannot go over oil.
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