On Wed, 07 May 2008 03:54:21 -0700, bp wrote:

Hi

I am almost ready to purchased a self build conservatory, but I have 1
problem and would like some advice. THe conservatory will have a
polycarbonate roof, and is of the lean to type.

There is a soil pipe on the wall where I want to fit my wall plate. I
cannot change the location so I need some advice on how to fit round
this. I have seen 2 options (from other photographs)

1) Cut the wall plate in 2 and fit either side of the soil pipe. Cut
the polycarb sheeting to the shape of the pipe. In effect this would be
a 'U' shaped cut in the sheeting. Then seal around the polycarb. I am
having trouble working out exactly how I would seal/flash around the
back of the soil pipe. What I have seen somewhere was just a whole load
of sealer piled up - hoping that it wouldn't leak. It did not look very
safe or reliable.

2) The only other option I have seen is where the builder built out from
the wall using timber. Large battens were fitted to the wall either
side of the soil pipe. Essentially a structure was built up and fixed
to the wall around the wall pipe. The conservatory then starts proud of
the pipe. The wall plate is fitted to the timber structure. The wall
plate does not need to be cut, nor does the polycarb sheeting. You
still have to seal up/flash the timber structure, and I could not see
how that was done, but I am assuming the builder chose that option as it
was preferable to cutting the sheeting because it would have been easier
to seal/flash the timber than to seal/flash sheeting that had been cut.

So can anyone recommend which of these is the better option, in terms of
getting a leakproof roof.

Either way how would someone flash up the soil pipe

May be there is a better option - if so I would like to hear it.


Many Thanks


Bhupesh

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If you have a flashing on the house wall covering the wall plate this will
work - it worked for me. You might have to vary the details but the
general idea works.

Cut two squares of lead flashing about 12" square (but to suit your
dimensions). Cut a circular hole in each about an inch less than the
diameter of the soil pipe. Use a pair of pliers to make a 1/2" upstand all
round each hole so that the hole is now the same diameter of the soil
pipe. Now make a cut in the side of each so that the piece of flashing can
be fed in from the side - requires some bending, and the cuts must be in
opposite sides. Make sure that each of the pieces of flashing can be fed
under the wall-plate flashing. When both pieces are correctly positioned
and tamped down, run a bead of silicone around the joint between the pipe
and the small upstands made in the flashing. Mine has been in place for
about two years now with no leaks.

Cic.
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