Aluminium - for strength and durabilityWhen double glazed windows first became popular in the late 1960's aluminium was the material most often used. Its main advantage was its strength. Windows manufactured with aluminium are more resistant to warping, twisting or sticking when subjected to the elements. They are also virtually intruder proof. Additionally aluminium neither absorbs water, rots or rusts.In the last decade aluminium windows have decreased in popularity mainly because it became a more expensive alternative than PVCu. Additionally the insulation qualities of aluminium are quite poor when compared to PVCu and it was often susceptible to condensation. This lack of insulation is partly remedied by installing a 'thermal break' in the aluminium frame. If you chose aluminium for your replacement windows we would only suggest you consider windows with a thermal break.Aluminium is a good choice for commercial locations and any situation where strength is a major issue. Aluminium windows can be fitted as 'direct fix' - i.e. directly against the brickwork or alternatively (and more often) into a hardwood subframe.Aluminium Systems suppliers include Monarch, Universal and Aliplast.