Roofs of Long span structures are made of steel trusses. They are can be designed with glazing ( inclined glass panels towards north sky) on north side, since in northern hemisphere there is no direct or harsh sun light in north. It provides a very consistent light indoors. Now a days even south lighting is also used for a more intense lighting. Proper care should be taken for rain water draining at glazed panels.
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truss
A roof truss must be engineered to perform under specific load requirements. Normally, building codes require a structural engineer's stamp of approval on truss design. Trusses are usually built on a flat surface using various grades of wood, with plywood or metal gussets joining the various pieces of the truss together. Multiple identical trusses are built with the use of a jig.
depend on what you want it to look like a lot of people go with a scissor truss on there houses
truss
You may be looking for rafter, column, joist, truss, strut, piling, stringer, stud, boom, brace, girder, jamb, lintel, pile, pillar, spar, stanchion.