If you take a look at this pictu

http://img.villagephotos.com/p/2005-...6/exterior.jpg

This house has a flat roof. The current owner uses drop ceiling in
many places so that he can route wiring, AC ducts and electrical and
lighting outlets through the roof. I don't like panelled drop ceiling
so if I get this house I will be removing them.

Which means I will have to find another way to route wires and ducts on
top. The roof has very little room a few inches with insulation that's
all. The second story on the left side actually has an exterior door
where it opens and one can walk on top of the flat roof.

What I am wondering is how easy will it be to build a new flat roof on
top of the existing flat roof (but elevated 24" or so higher) so we can
use that room to route wires and ducts. Then I can cover the roof with
flooring material (tiles or slates?) and put railings around it's
perimeter so the roof becomes a sun deck.

Will this be a prohibitively expensive project to do? How would I
determine if I can put new flooring on the roof - whether it was
designed to take this added weight or for someone to walk on? Any
other ideas?

I know this is probably more a question for a contractor, but this is a
house I plan on putting an offer on and I need to get as much
information as possible about what can and cannot be done.

Thanks in advance,

MC