Phil L wrote:

How big are the holes for the pipes? - can't the new pipes go through the
same holes? - flashband will last for several years plugging small holes up,
certainly an option worth considering, if feasible.


Due to a bathroom being re-built, the soil pipe needs to be replaced and
waste pipes from the shower, bath and sink will need to be relocated
too. Whichever way you look at it, some new holes will need to be made
and some existing holes will need to be made good. The existing holes
through the asbestos roof are prone to leaking anyway, so I'd rather
start afresh and have some chance of doing it right.


Plastic goes very brittle after only a few years, but obviously it's
cheap...if the walls are up to it, new timbers, battens and roof tiles? -
costly but probably the best, although probably less costly than metal /
condensation / drip / drip / drip :-p

We had plastic elsewhere previously and it went very brittle indeed. The
location does get some pretty serious sun, so it will need to withstand
that without going brittle or softening.