DASATOP®
Retrofit Vapour Control Layer
Advantages
- Airtightness installed from the outside
- Specifically developed for roof restoration
- Humidity-variable MVTR
- No additional airtight joints required at the rafters
- High tear resistance due to fleece reinforcement
Areas of application
DASATOP® is an air-resistive barrier for installation over rafters and across sarking in roof renovation projects. Installed from the outside, DASATOP® protects structures from rain wetting during construction while cladding is removed.
New protection for old buildings
Refurbishment from the outside
If roof tiles and the roofing underlay are being replaced, this also presents an opportunity to bring thermal insulation and airtightness into line with current requirements. The advantage of ‘sub-and-top’ installation is that all of the work can be carried out from the outside! The interior cladding can be retained and residents do not have to move out of their homes during refurbishment – which can often be an important criterion for rental properties.
Quick and reliable installation
The humidity-variable pro clima DASATOP vapour control membrane for refurbishment projects is installed onto the existing interior cladding using the ‘sub-and-top’ method; it is installed over the rafters and is pushed into the corners of the spaces between the rafters. Error-prone airtight bonds with the sides of the rafters are no longer necessary. Experience has shown that it is more practical to stick individual membranes to each other in advance on a flat working surface to create the required widths. In this way, airtightness can be achieved particularly quickly and easily.
DASATOP is installed onto the existing internal lining and continues over each rafter and into the next space between the rafters.
Advantage: Excellent reliability
The intelligent management of moisture facilitated by this membrane offers particularly good protection for the structure: when installed on the interior in the space between the rafters, it protects the structure against penetrating moisture with its sd value of up to 2 m (MVTR 10 MN·s/g).
On the exterior side of the rafters, on the cold side of the structure, the membrane is as open to diffusion as an underlay membrane with a value of 0,05 m and actively transports moisture to the outside and out of this critical area from a construction physics viewpoint.
Protection against dampness for insulation material in winter - at the same time, optimal drying conditions above the rafters.
