Pool on rooftop?

Does anyone know about load limits for the rooftops of village style houses? We are thinking of putting one of those Intex pools on it for the coming summer. Excellent things for the garden, yet on the roof?

I think the best person to ask would be a surveyer who can actually see the roof, I should imagine it would have to be built like an air raid bunker to hold the weight of a swimming pool

I know from owning just a large corner fish tank, when it is only half full of water it is impossible to move by two men, and full, well it just has to stay where it is!, they recommended that it was put on a very thick 6 inch concrete base, which it is, I wouldn't dare try to put it on the upper floor of our home. Water weighs a heck of a lot.

Also some people near to where we lived in Spain, put a Jacussi (just 4 person one) on their roof, the floors below started to slip because of the weight, and everything is concrete there.