"george [dicegeorge]" wrote in message
...
On 29/09/10 11:00, N_Cook wrote:
I hollared up to a roofer of 30 years scrabbling, reroofing in the same
road
today. He did not know a specific ratio but reckoned a cement tile roof
is 3
times as heavy, for the same roof-scape. His unseen mate on the rear roof
reckoned about the same


David Ireland's book 'How to rescue a House'
says concrete are 4 times heavier than slate

You can get fibre cement "slates" that look OK, they probably don't weigh
anymore than real slate and i doubt if anyone could spot them from the
ground. They are cheaper too, i was given some that are about 60cm x 30cm
and they retail for about 70p.

[g]