Hello,
my wife would like to have our basement window removed and the resulting opening closed. The window is completely below street level.
Our basement was poured with waterproof concrete, coated with bitumen, then the perimeter insulation was applied, and finally the dimpled membrane.
My questions are:
1. What is the best way to close the opening?
2. Should I use formwork and concrete? If so, all at once? What is the best way to seal the top edge, considering concrete shrinkage?
3. Or should I use masonry?
Thank you in advance.
my wife would like to have our basement window removed and the resulting opening closed. The window is completely below street level.
Our basement was poured with waterproof concrete, coated with bitumen, then the perimeter insulation was applied, and finally the dimpled membrane.
My questions are:
1. What is the best way to close the opening?
2. Should I use formwork and concrete? If so, all at once? What is the best way to seal the top edge, considering concrete shrinkage?
3. Or should I use masonry?
Thank you in advance.
Source mortar does not "swell" in that sense. It is simply especially dimensionally stable and not necessary for your purpose. If you are doing masonry anyway, just fill the last gap as well. There is really no need to overcomplicate it. If it absolutely must expand, you can also use construction foam.