An I-beam is a light beam support assembled by glueing together wooden flanges and fibreboard and plywood webs. Applications of use include the base floor-, intermediate floor and roof structures of buildings and external wall frames. I-beams are best suited in structures that require rigidity, heat insulation capacity, dimensional precision and economy. The beams are easy to work using normal carpentry tools, and holes can be made in the web plates for electrical and HVAC installations. When making alterations to the beams, however, the manufacturer’s or structural designer’s instructions must be observed. With a flanged beam, you can achieve the same load-bearing capacity with a smaller amount of material than with glued laminated timber or sawn timber, so the price is also competitive.