We had a window changed to a bifold door and unsure how to fill the gap in the what was cavity , under the rubble is sand and it seems to stop about 12 inches down, do I need to put a plastic
membrane down too?
View attachment 323623
We had a window changed to a bifold door and unsure how to fill the gap in the what was cavity , under the rubble is sand and it seems to stop about 12 inches down, do I need to put a plastic
membrane down too?
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