"Martin Angove" wrote in message
...

SNIP

.. Also there is some (usually ignored)
advice about where you can and can't drill holes in joists. What I want
to know is, why is it ok for a plumber to make a messy notch in a joist
big enough for two 28mm pipes a few inches from the end of a joist, yet
the IEE get all worked up about circular holes and insist that they
should only be within the area between 0.25 and 0.4 of the joist span?


Any Structural Engineers care to comment? (Especially about the closeness to
the end of said joist)