"Charles Middleton" wrote in message
...

"logized" wrote in message
...

I have just looked in a plumbing manual (from 1995) - it says holes
cannot
be bigger than 1/4 of the depth of the beam and the zone in which they
can
be made is between 0.25 and 0.4 of the length of the beam from wall.
Also,the holes must not be below the centre of the beam or closer than 3
times the diameter to any other holes.

Dave

Thanks for the info. What's the typical depth of a joist? My house was
built
in 1995 if it makes any difference.

CM.


I don't know what would be a typical depth of joist, I suppose it depends on
the span length and building regulations.
Here is a web page that agrees with the specifications for holes in joists
in my plumbing manual -
http://www.ukcopperboard.co.uk/downl...per%20tube.pdf

Dave