wrote in message om...
I'd consider looking into a metal roof. Probably would get y'all a
reduction in your insurance, and would last a lot longer, too.

A metal roof is great, but it would cost two or three times what a
shingle roof runs. I believe any reduction in insurance would be
minimal unless he was converting from wood shakes.
A roof is not just a covering to the dwelling. It is a system or part
of a system. The insulation and ventilation all work together with the
roof material. This is why a system that is set up to vent with a
single layer of roofing will not breath properly with two layers. A
metal roof does not breath at all and needs additional venting.
If the first roof system performed properly over the expected
lifespan, then duplicate that with a tear off and replacement rather
than adding layers or engineering a completely new system.