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WOOD ROOF FRAME vs. LIGHT STEEL

Currently the use of lightweight steel roof truss is rife. Homeowners who have passed the age of 20 years, usually start thinking about replacing the roof truss which is generally made of wood with a lightweight steel roof truss.
Lightweight steel roof truss that are commonly used have a cross section profile C, in addition to the cross section profile L and box (hollow). This profile aims to improve the ability to hold the compressive force.

People began to leave the wooden roof frame because it was generally vulnerable to wood pests, especially termites. Termite attacks have begun to enter the alarming stage. They can attack the wooden structures of buildings and houses indiscriminately. Large, small, terraced houses or one floor, he still attacked. Before we replace the wooden roof truss with mild steel, it is better if we discuss the differences of the two materials.
 
Strengths and Weaknesses of Wooden Roof Frames:
- Strong against the tensile force, press and bending moment.
- Are elastic and flexible. Resistant to the direction of the load that is perpendicular to the direction of wood fiber.
- Prices are relatively cheap.
- Easy to do and does not need to be too precise.
- Does not require special experts.
- Wood material is more flammable.
- Can change shape (curved due to expand, shrink or crack) if exposed to direct weather changes.
- Easily attacked by wood pests. The process of coating anti-termite chemicals is needed.
- Its weight is heavier so that it burdens the structure underneath.
- Easy to moldy and weathered if exposed to humidity or rain and direct heat.
- Rust resistant.
- The service life is relatively shorter than lightweight steel roof truss.
  
Strengths and weaknesses of lightweight steel roof truss:
- Strong against the compressive force between 650 MPA to 920 MPA.
- Less flexible than wood.
- The price cannot be said to be cheap.
- Need precision workmanship, because if not, other structures will be disturbed.
- Requires skilled personnel.
- More difficult to burn and more fire resistant.
- The value of expansion and shrinkage is so small that it does not change shape.
- Can not be attacked by wood pests.
- Its weight is lighter so it does not overload the structure underneath.
- Resistant to mold and weathering.
- Cannot resist rust if the coating has failed.
- The service life is relatively longer than the wooden roof truss.


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