Is there a standard accessory that covers/seals the join where a soil
stack passes though a flat roof?
Is this it? http://tinyurl.com/3d3er
If not, what's the recommended way of sealing the joint?
Thanks for any advice,
That's part of it - the Screwfix picture is upside down. The normal way of
doing it on a new build roof is to use a "lead slate" - it's a sheet of lead
about 500 x 500mm, with a hole in the centre for the stack pipe, with a soldered
lead sleeve about 150 high which you slide down the pipe. The lead is
interleaved into the roofing felt and the PVC weathering collar slides down the
pipe so that the splay bit covers the top of the sleeve.
Alternatively you can make a hole in the felt with criss-cross cuts to make 6 or
8 triangular bits that fold up the side of the pipe and then wrap a piece of
felt round to make a collar, but this is second best IMO
Thanks for the replies.
An air admittance valve wouldn't work in this case as the stack goes
through the roof of a single storey extension to serve the upstairs
Peter, is this the lead slate you mentioned?
The central part doesn't look large enough to fit round a soil pipe --
or maybe it's just not clear from the photo.
Yes that's one sort. This is the aluminium version with a rubber collar which
does stretch around a 110mm pipe - I'm looking at my neighbour's one like that
right now. I'm not sure if they do one for flat roofs though.
What I had in mind was more this sort of thing, made of sheet lead
You can get straight ones specially for flat roofs. They are sold through any
Builders Merchant, but you may have to order it.
Yes, it used to be sold by OSMA & was known as a VariPitch Pipe Flashing, it
could cope with quite a wide variation of roof slopes. There is also
available an all rubber version, which is better to work with as it is all
in one piece and easy to join roofing felt onto. Talk to your local builders
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