"Andy Hall" wrote in message
...
On Wed, 10 Nov 2004 00:30:17 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Tue, 9 Nov 2004 23:51:07 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Tue, 9 Nov 2004 23:04:06 +0000 (UTC), "Arthur"
wrote:

Hi all.
I have cut some notches in joists to accommodate the 22mm pipe
runs.
When it come to positioning the 22mm-22mm-10mm Tees, should I
keep them close to the joist or can I just position them halfway
between
the
joists?

It's a good idea to leave some spacing (say minimum of 10mm) to
allow
for the 22mm pipe to expand and contract without the risk of the
fittings coming right up to the joist.

Oh my God. Yiou have got to be joking? Mmmm, no he isn't.

The 22mm pipe is perpendicular to the joists........

Based on your exploits with incorrect bodged installation

You clearly are a bodger by what you describe. Tsk, tsk.

If the fittings are placed tightly to the joists then there may be
insufficient provision for expansion and contraction and therefore a
potential straining of the joints. Undulation in the pipe may provide
enough expansion capability but care does need to be taken to ensure
that there is provision for thermal effects.

Plastic joints should be well clipped either side to avoid strain on the
joint.