In article lgate.org,
says...
"The Natural Philosopher" wrote in message

Very low. Sub 15 degrees with machine made interlocking tiles, however
careful laying is necessary.
I shouldn't think there would be much danger if the new roof is
sheltered by the original building. The problem is that rain may be
blown back up the underside of the tiles.

I would go for the widest possible roof. Then -if there is a failure,
take
the tiles off and put some damp proof membrane in or a couple of lines
of
silicon with each course of tiles.

How many tiles high will the roof be?

Not sure yet. Still waiting for the architect to come back to us with
his preliminary drawings. Seeing some of the posts here gives me hope
though as all I need is interlocking tiles and it should all be fine
down to 20 degrees which is what the old lans said. Didn't mention
interlocking tiles though.

Thanks

--
John Kelly

Remove dimspam if replying by mail