ᐅ Preparing Wall Openings for Window Installation

Created on: 23 Mar 2023 09:07
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Finch039
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Finch039
23 Mar 2023 09:07
Hello everyone,

Please see the pictures. The reveals of the window openings need to be prepared and smoothed out before installation so the window installer can properly seal everything. The openings are now quite large in some places... unfortunately, a solid window sill had to be removed, and we slightly enlarged the openings at the bottom.

Two questions regarding this: What material is best suited to fill the openings? Would simply applying plaster be enough?

In the second picture, you can see the cavity wall construction. According to the window installer, I should simply install a rigid foam insulation board (e.g., Styrofoam) as a finish around the window. I plan to prepare an adhesive bed and stick the board onto the masonry. Do you see any issues with this approach?
Basement window covered with black plastic foil, framed by wood, in raw concrete wall.

Basement construction site: damaged wall with gap, plaster flaking off; broom and shoe visible.
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gtgeorge79
24 Mar 2023 07:23
The reveal should be smoothed with blue adhesive.
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Finch039
24 Mar 2023 09:47
Thank you for the reply. 🙂

But can I simply fill the large gaps at the bottom right and bottom left with construction adhesive in that amount?