How OSB are fastened into the load-bearing wooden substructure, which span widths are possible with which board thickness and much more information can be found in the
technical leaflets.
Flat roofs in timber construction require particularly great care in planning and realisation. This is because the vapour diffusion-tight waterproofing membranes of flat roofs can lead to excessively high moisture loads occurring in the construction of structures with an insulated rafter layer.
The requirements for flat roofs to work
safely and durably are described in the relevant
technical leaflets.