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The traditional frame material for windows is wood. 1_______. Wood is known to be a good thermal insulator and is extremely workable. It is easily turned into sashes.2_______. That is why wood elements require repainting every few years. 3_______. Besides, it requires no periodic repainting. 4_______. Aluminum also has its disadvantages. It is known to conduct heat so well that very soon condensation will form and even frost on interior window frame surface during cold winter weather.
But in the last decades aluminum, steel, plastic and combination of these materials are also commonly used
But its disadvantage is that it shrinks and swells when the weather conditions change
As to aluminum, it is relatively inexpensive and easily workable as a sash material
But aluminum should be thermally broken and supplied with plastic or synthetic rubber components in order to prevent the flow of heat or cold through the metal
