Facades last 30 to 50 years, roofs 40 to 60 years. They are constantly exposed to wind and weather and should be regularly checked for cracks or damage through which moisture could penetrate. This also applies to exterior doors (20 to 40 years), skylights (25 years) or windows (20 to 50 years, depending on the material). If you own an older house that has not yet been renovated for energy efficiency, renovating the building envelope will improve energy efficiency and save a lot of energy.

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