On Sat, 15 Oct 2005 11:27:52 +0100, Andy Dingley
wrote:

This will crack under its own weight.

I was assuming that this'd be something maybe 6" cubed. It'd only
crack under it's own weight if huge.

Obviously a lead box would need to be placed inside something else
(Concrete?) to provide mechanical strength and prevent it being
crushed.

Depending on the local water. In some conditions the water goes right
through them. Lead isn't actually that stable long-term, you need a
moderately hard water to build up a surface carbonate layer on it.

So how do lead covered roofs work? The rain water bounces straight
off. Rain water is also "soft" so there would be no build up of
minerals either.

sponix