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2 questions
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How do I make a round hole in overlapping cement board wall with limited access?
I am having a hard time planning a hole for a one room in wall ventilator.
I have already a 160mm hole in my exterior wall. However, on the outside the wall is covered in 3-mm square cement board ...
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Is this a load bearing beam?
Is the big steel beam running perpendicular to the joists a load bearing beam?
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