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Joists - notched in the middle of their span
just had an electrician install new sockets - but he has notched the joists, all along a room - and in the very centre of their span.
I think that is not to specs - there are regs on where you can notch and the centre of the beam's span seems the worst spot possible. The notch is appprox 1.5 cm so is below 1/8th of the joist height. But still.
I am concerned that these same joists were already notched for central heating and are quite bouncy.
--- turns out the notches were quite old, the electrician reused them rather than make further holes ---
1 Answer from a MyBuilder Electrician
Accrington • Member since 16 Dec 2010 • 33 jobs, 100% positive feedback
If notched into the joist cables are required to be provided with mechanical protection sufficient to prevent penetration of the cable by nails, screws and the like (NOTE: the requirement to prevent penetration is difficult to meet)
Maximum depth of notch should be 0.125x joist depth. In a zone between 0.07 and 0.25 of joist span.
Normal practice is to drill holes max 0.25 x joist depth at least 50mm from top and bottom. In a zone between 0.25 and 0.4 of joist span.
Answered 1st Dec 2019
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