cutting holes in joists
Posted by chris on June 14, 19100 at 09:58:58:
I am looking to relocate my toilet in my 1st floor flat. In its new location, the waste pipe (around 4" diameter) will need to cross over 1 possibly 2 8x2" joists in order to reach the outside waste stack.
Can you tell me as to whether it is safe to drill out a 4" diameter hole from a 8" thick joist leaving 2" above and below the hole? Also where on the joist span, is the best place to cut the hole?
I have read that it is safe to cut a hole upto half the thickness of the joist whilst notches should be no greater than 1/6th of the joist depth, is this true?
Youre advice would be greatly valued. Many thanks.

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