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Floor After Window to French Door Conversion

Posted: Tue May 07, 2019 5:34 pm
by G1ggs
Hi all,
This is my first post so bare with.
I'm renovating an old house I've bought and I've had the back window in the living room converted to French Patio Doors but this has left a void between the doors and internal floor (see pics)
Do I just line this with some damp course membrane and then fill with concrete or are there better solutions?
Thanks
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