Aluminium windows and doors are known for their strength and durability. Aluminium’s inherent strength allows the use of slimer profile offering smaller sightlines. These benefits make aluminium an excellent option for bi-folding doors. Aluminium has a life span of approximately 45 years and are more easily recycled than uPVC. They are also very low maintenance. Aluminium, however, is a more costly option than uPVC. Another downside to aluminium, is that it is a considerably poor insulator. Its thermal performance is also inferior to uPVC.