ᐅ Replastering Window Reveals and Closing Openings – What Is the Correct Procedure?
Created on: 28 Apr 2026 11:26
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dietrichd
Hello everyone,
we recently bought a house and are currently in the middle of renovating it.
A few years ago, new windows were installed. While removing the wallpaper, some of the plaster in the window reveals came off. We noticed that the plaster around all the window reveals sounds hollow. Therefore, we plan to completely remove it and replaster the reveals (or have them replastered).
The windows were foamed at the time, but it doesn’t appear that any sealing tape was installed. Now, there are some larger gaps in certain places that go all the way to the brickwork. Of course, we want to properly seal these.
Here are my questions:
In addition, we want to close up the wall boxes for the roller shutter straps as well as the opening for the kitchen exhaust hood (about 17cm (7 inches) diameter).
Would you foam and plaster such openings, or is there a better solution for this?
Thank you in advance for your help!
we recently bought a house and are currently in the middle of renovating it.
A few years ago, new windows were installed. While removing the wallpaper, some of the plaster in the window reveals came off. We noticed that the plaster around all the window reveals sounds hollow. Therefore, we plan to completely remove it and replaster the reveals (or have them replastered).
The windows were foamed at the time, but it doesn’t appear that any sealing tape was installed. Now, there are some larger gaps in certain places that go all the way to the brickwork. Of course, we want to properly seal these.
Here are my questions:
- Is it sufficient to foam the cavities again and then plaster them cleanly?
- Should sealing tape be installed as well?
- Would it make sense to install, for example, a waterproof insulation board or something similar?
In addition, we want to close up the wall boxes for the roller shutter straps as well as the opening for the kitchen exhaust hood (about 17cm (7 inches) diameter).
Would you foam and plaster such openings, or is there a better solution for this?
Thank you in advance for your help!
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nordanney28 Apr 2026 13:50dietrichd schrieb:
Is that problematic with calcium silicate boards Nothing applied on top except lime plaster or similar. No paint fleece, no wallpaper, no paint other than lime paint or silicate paint.
If you don’t want that, save your money and don’t use calcium silicate boards but rather construction boards (Wedi or similar). Otherwise, you will simply negate the benefits of the expensive boards.
dietrichd schrieb:
We recently purchased a house and are currently in the middle of renovating it. New windows were installed a few years ago. While removing the wallpaper, we noticed that some of the plaster around the window reveals came off. We found that the plaster in all window reveals sounds hollow. Therefore, we plan to completely remove the plaster and replaster the reveals (or have this done). The windows were foamed in at the time, but it does not appear that any sealing tape was installed. Now, there are some larger gaps extending to the brickwork in certain areas. Naturally, we want to properly seal these. This sounds like poor professional installation of the windows to me, and I would assume that the plaster sounds hollow because it has detached from the window reveal due to cold-related issues. Simply removing and renewing the plaster would not address the root cause. It would be advisable to consult experts in energy consulting and window installation to check whether the windows were installed correctly in terms of alignment; otherwise, the measures might only have cosmetic effects unintentionally.https://www.instagram.com/11antgmxde/
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dietrichd18 May 2026 12:18Hello,
after several consultations, I have now received a proposal from the window manufacturer.
The windows are installed from the outside using a compressible sealing tape and are sealed; an additional sealing tape is probably not necessary.
The plaster detaching is likely due to the old windows that were installed at the time.
As a solution, it is recommended to fill the existing holes, which are only partial, with window foam (blue), then wait 1–2 days, carefully cut off the excess foam, and restore the plaster (not gypsum-based) with reinforcing mesh.
What do you think?
after several consultations, I have now received a proposal from the window manufacturer.
The windows are installed from the outside using a compressible sealing tape and are sealed; an additional sealing tape is probably not necessary.
The plaster detaching is likely due to the old windows that were installed at the time.
As a solution, it is recommended to fill the existing holes, which are only partial, with window foam (blue), then wait 1–2 days, carefully cut off the excess foam, and restore the plaster (not gypsum-based) with reinforcing mesh.
What do you think?
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