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What beam size do I need for a 12m roof span?

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Determining the beam size for a 12-meter roof span requires careful consideration of several factors, including the type of load the beam will carry, the material used (steel or wood), and the beam’s design (whether it’s simply supported or continuous).

Key Factors to Consider:

  1. Material: Steel beams are stronger and more compact than wood beams for long spans.
  2. Load Type: Live loads (such as snow or people) and dead loads (roof weight) impact the required beam size.
  3. Beam Design: A simply supported beam will require a larger section compared to a continuous beam.

Steel Beam Example:

For a standard residential load (dead load = 1.5kN/m², live load = 2.5kN/m²), an I-beam or H-beam size in the range of 300–400mm deep could work, depending on specific load factors.

Wood Beam Example:

For wood, a glulam beam with a depth of around 450–550mm might be necessary to support a 12-meter span. However, wood beams are typically not recommended for such large spans due to the risk of sagging.

Conclusion:

The final beam size depends on load specifications, materials, and building codes. Consulting a structural engineer is essential to determine the exact beam dimensions needed for your specific project.

 

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