Cross-laminated timber can be used for many varied roof layouts with the same efficiency, due to the design flexibility of the material. Moreover, CLT roofing can also be very quickly constructed, therefore, buildings made using it can be made water-tight in a very short time. If the building envelope is designed correctly, cross-laminated timber also allows making it air-tight, which helps with controlling the heat transfer and the humidity levels of the building. That, in turn, is crucial to improving its energy efficiency and durability. As proper roof insulation is also extremely important to avoid heat loss from the building, the favourable thermal properties of cross-laminated timber can be considered an advantage as well.