Wooden casements provide good insulation and structural strength, but must be protected from bad weather, either with regular paint or stain, or an easy-maintenance factory coating or finish. WoodĮxpensive and requiring more maintenance (15-year lifespan instead of 25 for other materials), wood is more vulnerable to adverse weather and humidity. Aluminum frames and casements must have good thermal insulation to reduce heat loss through conduction. Since this metal is very conductive, it will be colder in winter. Sturdier than PVC, aluminum makes it possible to have thinner frames that leave more room for the glass. For wide windows, for instance 75 cm (30”) wide, thick PVC should be used otherwise the frame could become warped after two or three years. Its main quality is its thickness, which generally ranges from 1.8 mm ( 1 / 16 ”) to 2.5 mm ( 3 / 32 ”). It is a type of plastic - the cheapest and most popular, but also the most fragile.
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