Technology and installation: Double-skin insulated, non-ventilated roof system

Double-skin insulated roof systems comprise a supporting substructure made from trapezoidal profiles, the insulation and moisture protection package, a spacer construction and trapezoidal profiles on the top of the roof as weather protection. The spacer construction generally comprises canted Z profiles made from galvanised or galvanised/coated sheet steel or occasionally from a timber structure. Timber structures must be treated with the necessary moisture and insect protection.

In non-ventilated roof systems, there is no ventilated layer between the insulation and the trapezoidal profile on the top of the roof.

For greater insulation thicknesses, the insulation should be installed as two layers with an offset. The insulation thickness chosen is 20 mm greater than the space between the insulation and the roof profile so that no cavities occur. The insulation is then compressed when installing the trapezoidal roof profiles. This prevents air which has penetrated from getting into the roof system.

Thermal bridging between the upper roof shell and the spacer construction is minimised with appropriate thermal separation strips made from fibre composite material or plastic. The spacer construction can also be implemented as 2 layers where appropriate. The spacer construction is generally installed diagonally.