Cross Laminated Timber
Cross-laminated timber (CLT) is a wood panel product made from gluing layers of solid-sawn lumber together. Each layer of boards is oriented perpendicular to adjacent layers and glued on the wide faces of each board, usually in a symmetric way so that the outer layers have the same orientation. An odd number of layers is most common, but there are configurations with even numbers as well (which are then arranged to give a symmetric configuration).
Regular timber is an anisotropic material, meaning that the physical properties change depending on the direction at which the force is applied. By gluing layers of wood at perpendicular angles, the panel is able to achieve better structural rigidity in both directions. It is similar to plywood but with distinctively thicker laminations. The evolution of engineered wood products has expanded building options and methods in all forms of residential and commercial construction and offer environmentally friendly green products.
Cross laminated timber is a new generation engineered product which has gained popularity in Europe and north America. Theses structural advantages of CLT has wide spread to all developing countries. The excellent performance of CLT with environmental friendly, ease of application, quick assembly has become more preferred material for designers. The adhesives in the production of any engineered product is the most important parameter. Generally, Phenol resorcinol, formaldehyde resins, polyurethane resins and emulsified isocyanate resins are being used for the manufacture of CLT
