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What we describe here is the roof system that goes on most houses except the very high end such as real clay tile or cement tile, a few asphalt shingle roofs and the Nipa or sheet steel roofs of the ordinary “bahay” – native house. See THIS POST We have drawn some conclusions from Typhoon Yolanda damage in Tacloban, including ways that our roof could be made more typhoon resistant. Steel trusses of various designs rise from the topmost concrete roof beam.
The trusses are welded to stubs of rebar protruding through and well anchored in the concrete roof beam. See comments below) The trusses are almost always welded-up on-site and then primed.
Once the purlins, facia and soffit frames, facia board and gutters are in place, the long span roofing can be screwed to the purlins using self-tapping tek screws.
This is usually done by a crew working for the company which sells the roofing.