Roger Mills wrote:
In an earlier contribution to this discussion,
James Abley wrote:

Rules - as in building regs, or laws of nature rules?

Both. The building regs include rules about where holes and notches can be
in order not to compromise the structural integrity. They have been quoted
in this NG in the past, but I can't quote the exact details offhand.

From:

http://wiki.diyfaq.org.uk/index.php?...llation#Joists

"To meet current building regulations, the hole does not want to be more
than 0.25 times the total joist height - so a 2" hole on a 8" joist is
about the limit. It should also not go closer to the end of the joist
than 1/4 of the span (so no nearer than 1m from the end of a 4m joist),
and no closer to the centre than 0.4 times the span."



--
Cheers,

John.

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