What section size is appropriate for my Project?
Typically, a rule of thumb suggests adding 5 cm to the cross-sectional height for every meter of span. Following this guideline, an oak beam measuring 30×40 cm would provide ample strength for an 8-meter span. Always consult an engineer for precise dimension calculations.
An rectangular oak beam offers added robustness, as a 30×40 cm beam has less volume compared to a 40×40 cm one. This extra weight contributes to a downward force, with a horizontal support beam’s strength primarily influenced by its vertical height. Additionally, an asymmetric cross-section ensures a less imposing appearance in an interior.
What is the weight of such oak beams?
The weight of an oak beam varies after several years of the drying process, typically ranging between 750 and 850 kg per cubic meter. Initially influenced by moisture content, the volumetric mass of oak wood decreases as the beam dries. A dry oak beam consistently weighs less than a freshly sawn one, which can exceed 1000 kg per cubic meter.
Furthermore, the beam’s density is influenced by the growth area; a beam with fine grains may be heavier than one cut from a faster-growing tree.
Weight indications include:
> 30×30 cm / approx. 70 kg per linear meter (m1)
> 30×35 cm / approx. 80 kg per linear meter (m1)
> 30×40 cm / approx. 95 kg per linear meter (m1)