Hi All I have a lean-to at the back of the house with a twinwall UPVC roof. This roof is leaking and needs replacing. To make this difficult, the existing roof has the main waste down spout going through it. The previous owner used two halves of a drain cover to try and seal this, but it looks messy. Once I have installed the new twinwall roof sheet around the downpipe, what can I use to seal around it neatly? Thank you
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