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Harry Bloomfield[_3_] Harry Bloomfield[_3_] is offline
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Default Waterproofing a cement asbestos roof.

Hugh - Was Invisible pretended :
The roof is under a 60 feet high tree and has quite a coating of moss and
twigs. Removing them would be difficult without risking breaking panels and
the moss etc probably cushion the panels against falling dead branches.

Any ideas of how I could waterproof it from the inside?


The moss will be preventing the free draining, backing up the water,
which will then be flowing up the joints. Your only sensible solution,
is to get rid of the moss. You could caulk the visible inner ends of
the sheets at their lowest points which will help.

To kill the moss run bared copper wire across the roof's higher end, so
that the copper sulphate formed on the copper is washed down the length
of the roof.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk