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Cutting a Hole in a Concrete Flat Roof for a Hatch

Postby BAKid » Fri Feb 21, 2020 11:07 am

I am installing a loft ladder in a bedroom and when we cut the ceiling away we discovered we have an old concrete flat roof. The joiner called it "bison". He can't continue until i get the hole in the concrete. How do i cut a square hole in this concrete which is approx 500mm thick?
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