Tony Bryer wrote:
In article , Adrian C wrote:

What sort of concrete tiles - lots of reroofing is done with Redland
49's or similar, about 12"x8" and although each tile is obviously
heavier than small plain tiles the overall weight is significantly
less. They are though much heavier than slates which is why you
often see sagging where tiles have been used to replace slates with
no thought of strengthening the roof.

Thanks for the info. Yep, it's those 12"x8" tiles. We will keep the old
roof, hasn't majorly let us down as yet :-)

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Adrian C