The concrete roof frame is made of concrete. It is a mixture of sand, cement, and split with a certain ratio which is cast on the mold by providing reinforcing steel in it. The size of the width and length of the beam is made with a ratio of 2: 3, with a height of about 1/10 to 1/12 span.
The frame of the concrete roof is usually combined with other materials for gording, rafters, and battens, such as wood or mild steel. The concrete roof frame has the heaviest load compared to other roof frames. Therefore the load of the concrete roof is greater for the structure below it (beams, columns, foundations). Another disadvantage, the process is relatively complicated.
It starts from the flow of the reinforcement process and installation of formwork, casting, dismantling formwork, drying, and tampering. Drying time is also relatively long, at least around 28 days. Sometimes the size can also be incorrect. But the concrete roof truss also has several advantages.
Such as anti-termite, anti-fungal, anti-rust, non-flammable, and does not have shrinkage expansion. The concrete roof frame in roof installation is also more durable, and provides more space.