I-Joists are made of solid wood flanges (CLS) and a OSB core plate. I-joists have a greater bearing capacity than the traditional construction wood, in addition they remain straight and the shrinkage, cracking, bending and warping are limited. I-Joists are easy to process, available in long lengths and weigh a lot less than traditional solid wood. Due to these specific properties it is possible to use less material and to save in the assembly time. I-joists are therefore suitable for various applications, both in new construction and renovation projects.