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Floor After Window to French Door Conversion

Posted: Thu Aug 15, 2019 10:08 am
by G1ggs
Hi all,
I'm renovating an old house 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 cement/concrete or are there better solutions?
Thanks
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