Span 13 meters of the roof beam how to do the roof with 75mm foam sandwich board does not consider the wind load (indoor)
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Normal concrete beam span of not more than 5 meters, or the volume of the beam to do very exaggerated.
So use a lightweight architecture
It is understood that foreign general steel truss girder, but also useful wood beams under the steel truss.
Do you need to make a flat beam or a triangle? Made flat can use H-beam, do the triangle can be used C-shaped double-fight. Depends on your specific requirements.
