This film illustrates all steps from stocktaking and evaluation of the existing roof construction including the roof windows and chimneys to the renovation of damaged roof elements and a professional thermal insulation of the roof.
The following explanations of the film are supplemented by architectural drawings and photos, which were created in the course of the research project to convert an old building into a low-energy house.
For inhabited or used rooms of an attic, the roof surface forms the largest part of the boundary surface and thus the largest part of the heat exchange surface.
The loss of energy in case of insufficient thermal insulation and leaky roof surfaces is very high, therefore energy-saving measures in this area are particularly efficient.
For existing inadequately insulated and sloped roofs, additional insulation can be installed between, under or above the rafters. Flat roofs are also suitable for additional or new thermal insulation. According to the GEG 2021, the minimum requirement for the heat transfer coefficient for roofs is U=0.24 W/m²K.
As the upper limit of the building envelope, the roof is exposed like no other construction to the extreme stresses of rain, snow, wind, cold, and heat. Damage to roof structures, roof coverings, and their connections to skylights, chimneys, and gutters can be the result.
The
examples in the pictures show damage and moisture in the roof structure.
Moisture that penetrates through damaged roof coverings or is caused by the
condensation of air humidity can cause decay.
Insects, fungi, or overstressing by loads can also cause damage to wooden
structures.