What is a common rule of thumb for the depth of beams?

The commonly accepted rule of thumb for determining the depth of beams is based on the span of the beam itself. The depth being equal to the span divided by 16 (depth = span/16) is often used for standard load conditions. This relationship ensures that the beam has enough depth to adequately support the loads it will carry while minimizing deflection and maintaining structural integrity.

Using this ratio helps architects and engineers quickly estimate beam sizes without needing to engage in complex calculations for every scenario. It strikes a balance between material efficiency and structural performance, providing a practical guideline in the early stages of design.

Beams designed with this depth-to-span ratio generally remain within permissible deflection limits, which is critical to ensure safety and functionality. This depth also helps accommodate required connections and mechanical systems integrated into the beams, further aligning within standard construction practices.