On 09/05/16 10:26, newshound wrote:
On 5/9/2016 8:29 AM, Chris French wrote:
Wrote in message:
I'm planning an extension to my house, and want to make flat roof
that will last a long time, is maintenance-free and tough enough for
people to walk around on, and is fairly light in colour on the surface.


When you say walk around on, do you mean occasionally for access,
or for regular use?


That's the key question. Other options to those already listed are
fibreglass, lead, and zinc.

Regular use one has to assume chair legs and inappropriate footware will
be an issue.

For irregular access, add aluminium and copper and maybe EDPM rubber.

Personally, I'd go for zinc, or copper if it's out of the way of pikey
prying eyes.