In addition to thermal energy performance, windows and doors must provide the appropriate operational and structural performance in order to keep the unwanted air, water and wind elements out and let desired light, warm sun and cool breezes in when you want. Different types and sizes of windows and doors will perform differently when it comes to structural capability. Combining windows together, their material composition, glass type and location on the exterior of the home will also affect structural performance. Windows in Canada are rated for operational performance based on CSA International’s CSA-A440-00 Window Standard. Consider the following when comparing air, water and structural performance:
AIR TIGHTNESS (A):
Performance is indicated by a rating from A1 to A3. The higher the number the more air-tight the window.
WATER TIGHTNESS (B):
Performance is indicated by a rating from B1 to B7 for windows and B1 to B4 for sliding doors. The higher the number the more water-tight the product.
WIND LOAD RESISTANCE (C):
For windows there are five levels of wind resistance performance from C1 to C5. For sliding doors there are three, form C1 to C3. A higher number indicates better performance.
FORCED ENTRY RESISTANCE (F):
Two ratings are used to measure a window or door’s level of resistance to forced entry. For windows, F10 meets the standard level of resistance; F20 indicates and higher level of resistance. Sliding patio doors are required to have a lock or latching mechanism that has passed forced entry resistance testing.
SCREEN STRENGTH (S):
Window screen strength is indicate by a rating of S1 or S2 which considers propensity to tearing, damage and retention when subjected to loading. S2 is stronger than S1.
EASE OF OPERATION (E):
Sliding doors are rated from E1 to E3 based on the force required to open and close. E3 moves most effortlessly. Dashwood windows and doors are tested and certified to meet or exceed CSA A-440 standards.