Choose from aluminum or steel covers. Steel is used
mostly commercially. Aluminum is pre-finished, maintenance free and
pleasing. You three choices are “W” pan or some times
called “V” pan, flat pan style, and insulated. When viewed
from the underside the “W” pan has the shape of “W” shape
visible, the flat pan and insulated resemble a flat ceiling look.
Thus the flat pan or insulated would work as a patio room or screen
room cover. The span capability (load carrying ability) of the different
styles is governed by the thickness of the material, the depth of
the pan. The thickness of the aluminum the roof panel is formed out
of, or the thickness of foam in case of the insulated and the density
of the foam, effect how many feet between supports you can span and
meet a given load requirement. Insulated style carport covers can
be price competitive in some situations. It depends on the clear
span need and the load requirements.