Steel Beam Web Hole Opening
Structural calculations for web openings and strengthening
We provide structural calculation checks and strengthening design for large service holes through steel beams to meet Building Regulations (calculations to BS5950 or Eurocode 3).
Our Structural Engineers will check your beam based on the specific beam, loading and hole requirements of your project.
Holes through steel beams
Holes through steel beams, or 'web openings' are often required to allow larger services to pass through, such as soil pipes, air conditioning ductwork etc.
Steel beam arrangements in loft conversions often create challenges when routing shower waste or soil pipes and creating a hole through a steel beam can provide a solution.
Allowable hole size
Reasonably large holes can be made through the web (the vertical stem) of a steel beam before reinforcement is required, depending on the beam load. Calculation should always be carried out to confirm adequacy of the arrangement for the applied loading - Building Control will usually request justifying calculations.
See the diagram below for recommended maximum hole sizes, positioning and spacing.