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In this case we seem to have gotten away with this snap decision. On the spot, we decided to increase the roof height to 3.0 meters This what’s possible when you’re running your own crew, but such decisions, if they’re not carefully thought out, can have ramifications you’ve not yet imagined. We put up the center girt and two rafters and the roof pitch just looked too low. Originally, the height of our roof from the top of the wall to the peak of the roof girt was to be 2.5 meters. The 35cm wide rafters use the same angle bar. The center girt is 40cm wide and is welded up from 2″ x 2″ angle bar, 5mm for the frame and 3mm for the webbing. Making roof rafters in our on-site welding shop This would allow us to have quite a lot of open space in the attic, although we never requested this and are unlikely to use the attic space. Our trusses were designed so that they could span the entire house without support - sort of like what you’d see in a basketball court or warehouse. This requires less steel and saves money. Most trusses use the interior walls of the house for support so that the spans are shorter. In total, the roof is held on by at least thirty such rebars. Here you see four 12mm rebar wrapped around the truss and welded in place. We did not see any roofs of this type blown off during Typhoon Frank in Iloilo City. The trusses are welded to stubs of rebar previously embedded in the roof beam for that purpose. Metal trusses of of various designs rise from the roof beam which top the hollow block walls. This photo shows the perimeter wall, the carport, the bahay kubo and my “office”.
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There are cheaper epoxy primers, but we’re impressed with the Boysen. Once the hardener is mixed into the primer, it very difficult to clean brushes. Finally, I learned to buy cheap brushes which could be discarded. Some of my crew members tended to waste the reducer, especially trying to clean brushes. You’ll also have to buy epoxy reducer, an expensive thinner for epoxy. You get two cans per gallon, the primer and a smaller can of hardener. We used Boysen Red Oxide Epoxy Primer which we bought from Iloilo City Hardware on Iznart Street in Iloilo City.
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It’s best to use one of the two part epoxy primers, especially if you’re anywhere near the sea. The trusses are almost always welded-up on-site and then primed. (One reader suggests that this is inadequate. The trusses are welded to stubs of rebar protruding through and well anchored in the concrete roof beam. Steel trusses of various designs rise from the topmost concrete roof beam. We have drawn some conclusions from Typhoon Yolanda damage in Tacloban, including ways that our roof could be made more typhoon resistant. 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. Roofing systems have become very standardized in the Philippines. What we’ve learned about roofing systems, roof trusses, roofing materials and cost of roofing in the Philippines as part of our house building project.