Underlays
Underlays are installed as additional protection under roof claddings consisting of clay or concrete roof tiles, slate, bitumen shingles, fibre cement and metals. In accordance with their properties, they are installed over the rafters and/or boarding and/or thermal insulation layers. A distinction is made between bonded and lapped underlays.Bonded underlay:
Sufficiently waterproof. Is sealed to give waterproof seams and joins.
Lapped underlay:
Sufficiently waterproof. Overlayers are loose lapped.
Worth knowing ...
Self-adhesive lap technology - economical and efficientBauder's self-adhesive lap underlays and subroof membranes enable installation to be completed remarkably quickly with an excellent seal in the overlap area. Even in breathable roof structures, a bonded underlay can be installed in this way in accordance with technical guidelines. with BauderTOP DIFUBIT NSK and BauderTOP DIFUTEX NSK. An airtight roof structure conforming to the energy saving regulations (EnEV) and DIN 4108, Part 7, can also be created simply and reliably. This is where BauderTOP TS 75 NSK or BauderTOP TS 40 NSK come into play underneath the thermal insulation.