Mass timber is a category of prefabricated engineered wood products, including Glued Laminated Timber (Glulam) and Cross Laminated Timber (CLT) components. CLT panels are comprised of multiple layers of kiln-dried lumber, each stacked perpendicularly and bonded using high press force and formaldehyde-free structural adhesives. The large-format building elements are used as wall, ceiling and roof panels mainly in combination with Glulam beams and columns. CLT has a crosswise structure that reduces wood expansion and shrinkage to an insignificant minimum.
At the same time, this raises the structural load capacity and dimensional stability of the components. The result is a lightweight and durable building material, with favorable fire, seismic and thermal performances. European architecture has been utilizing CLT for over twenty years. Thanks to the gradual update of local building codes (In 2015, CLT was approved as a structural system in the International Building Code), North America and Asia Pacific markets are now emerging and growing particularly fast.