"harry" wrote in message
...
On 28 Sep, 09:18, "N_Cook" wrote:
Or as tile and slate seems about the same weight per sq foot, what is the
amount of overlap for slates and for tiles?

I would have thought slate was lighter.

certainly against cement tiles.

I can't remember the prog but on one recent house buying program the buyer
had to pay for a strengthen roof because the previous owner had replaced
slate with concrete and the roof had stated to collapse.

tim