The choice for windows and doors casings in a building has a strategic importance both because of the comfort and the energy efficiency. Energy efficiency is evaluated on the basis of the heat transmission rate (U) which determines the average flow of heat that passes through a flat surface that divides two rooms at different temperatures. Consequently, a lower U-rate means lower heat dispersion. It is estimated that in a building with lower quality windows and doors casings 30% of the energy used to heat the building is lost. It is then essential to invest in low U-rate windows and doors. But the U-rate isn’t the only thing you have to keep in mind. In compliance with the UNI EN 14351-1 norm the doors and windows must be wind resistant, waterproof, air permeable as well as durable. Moreover, since February 1st 2009, only CE marked doors and windows can be sold legally. Discover in our doors and windows section the most performing solutions and the innovative products for your house!