New answers tagged plaster
Primer will cure a lot, and this is one of them. I'm assuming you will be using painters, they will know how prep the walls so you will never see where it was graffiti-ed.
You can also (apart from DA01's answer): Drill a hole to see if a red 'powder' is what's inside. Knock on it. Listen to how it resonates. It may require some masonery 'insight', but i bet it can help and You could distinguish if there's a open place (like between metal sheets) inside. Combine few of these approaches to get an answer.
Yes, you can cut a hole in the plaster and see if there is brick behind it. Perhaps an easier way is if this is on an outside wall and the brick no the outside goes all the way up. If so, odds are that it goes all the way up on the inside, as this would likely have been a full masonry chimney when it was built (as opposed to modern fireplace inserts which ...
If there is a space behind the plaster board and the brick wall it is most likely that there have been wooden strips mounted to the brick and then the plaster board has been in turn mounted to those wood strips. I would expect you to find a strip vertical right next to the window, one on each side of the corner in from the window and then some under the ...
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