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Roof

Providing excellent thermal insulation in/around the roof is generally very straightforward. Thus a U value better than the required 0.15 W/m²K is achieved in many buildings.

In the case of timber structures, the rafters or beams should be slim and tall, so that the insulation can be 30 to 40 cm thick or more. Mutatis mutandis this applies to flat roofs, too.