There is no rule of thumb guide to get the accurate size of beams, rafters, floor or ceiling joists. You need structural calculations to get the szes correct for each application.

Avoid any problem, get us to size the Beam for you with our Professional Structural  Calculations.

Our Calculations are made on a form for direct submission to your local authority, building control or council.

The Calculations will be sent to you in pdf format via email in 1-2 days or less.