Roof structures with OSB and DHF

Technical Support

You have any technical questions or need support concerning our products and their application? Our application engineers are pleased to support you with any queries you have:

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Roof formwork made of OSB boards

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 .

Pitched roofs – underlays with Egger DHF Vapour Permeable Sheathing Panels

In pitched roofs with roof coverings consisting of small pieces, such as tiles or concrete blocks, EGGERDHF Vapour Permeable Sheathing Panels are used as underlay on the rafters. The form-fitting and tightly closing tongue-and-groove profile ensures that secondary condensation water, rain and snow penetrating through joints are safely drained to the eaves.

Underlay with DHF

In general, no further measures are required for roofs with a pitch of at least 14°. In low-pitched roofs, the joints of the panels must be taped with suitable adhesive tape.

In this application, OSB boards can be used as a covering underlay for an additional foil-shaped sub-roof, if necessary, with special consideration of freedom from condensation and moisture protection.