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How to install doors to the basement if the opening is too narrow?

I'm building a door to the basement. The cutout for this in the masonry is very narrow. I had to shorten the bottom frame by a few mm. Now the frame is inside, but there is only 3 mm to the wall. How do I get the foam in there? The nose doesn't fit in there.

Does anyone have any tips?

• basement
• door installation