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Hole and Notches in close proximity

RustyH

Are there any regs relating to drilling a new hole below an existing notch. 

Regs only seem to define the span criteria, and I can not see any guidance in Part P. 

It would seem logical to me to offset any hole a set distance from a notch, but drilling a hole below a notch equally seems compliant? 

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    The accepted areas for notching and those for holes don't quite overlap, notches 0.07 to 0.25 of span, and holes 0.25 to 0.4 of span. So you can't go directly below a notch.

    That might be the modern theory - older practice was to notch wherever a pipe or cable was wanted to run - regardless of where in the span it was. On the other hand timbers in older houses tended to be deeper, thicker and probably of better quality timber than modern minimalist standards, so notches 'out of place' very rarely caused any problems in practice. I can well imagine coming across an existing notch where you'd want to put a hole these days, and re-using a notch is tricky if you're using T&E given the 50mm rule. Another case for BS 8436 cable perhaps.

       - Andy.

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  • 0

    The accepted areas for notching and those for holes don't quite overlap, notches 0.07 to 0.25 of span, and holes 0.25 to 0.4 of span. So you can't go directly below a notch.

    That might be the modern theory - older practice was to notch wherever a pipe or cable was wanted to run - regardless of where in the span it was. On the other hand timbers in older houses tended to be deeper, thicker and probably of better quality timber than modern minimalist standards, so notches 'out of place' very rarely caused any problems in practice. I can well imagine coming across an existing notch where you'd want to put a hole these days, and re-using a notch is tricky if you're using T&E given the 50mm rule. Another case for BS 8436 cable perhaps.

       - Andy.

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