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
Also, is it easy or difficult to bend 22mm by hand within a gap between
about 12 inches?
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.
Other than that, if you are bringing the 10mm pipe along parallel to
the joists, then it may make sense to have the fitting positioned to
allow the pipe to be clipped to the joist without having to put too
big a set of bends in the 10mm.
What kind of bend? if it's 90 degrees, a bend in a 300mm radius is
reasonably easy. If you want to go tighter, then you get metal
formers which clip onto the pipe and hold it in place.
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.
In fact they should be clipped in a way to allow longitudinal movement
for thermal expansion. For 22mm tube, support is only required for
horizontal runs every 0.5m anyway and the OP has a space of 300mm.
How would you propose to do that when the 22mm pipe is running
perpendicular to the joists? Where would you suggest fitting these
clips? I haven't found any manufacturer who suggests that clips
are needed in the context you suggest
you must be *THE* IMM!
you really exist! i thought people were winding me up when they told
me about a loon that insists on using a hacksaw with speedfit
how are you? caused any more disasters recently?
The 10mm pipe needs to be fixed to the joists? If they don't, then I don't
think it matters where they are under the floor. But if you want to fix
them to the joists, then the closer the better for a neater job.
Bending pipe should always be done with a proper internal spring insert or
an external bending form. Trying to bend anything larger than 12mm soft
copper by hand is a real no, no. If you already have a bending spring there
is nothing stopping you from forming a bend around your knee or over a piece
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