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.

Installation instructions

Installation steps

Installation steps

Installation video: Roof retrofit from the outside

 Installation instructions

General conditions

DASATOP is to be installed with the printed side facing the installation technician. It is to be installed horizontally (parallel to the eave). Alternatively, it can be installed parallel to the rafters if adhesion to the rafters is carried out in a waterproof manner. The weight of the insulation material must be supported by suitable interior cladding or cross battens at a separation distance of a maximum of 25 cm.

To avoid condensation formation, the thermal insulation should be installed immediately after airtight installation of DASATOP. This applies particularly to work carried out in winter.

DASATOP may only be installed on dry building sites. If plastering or screed-laying work is to be carried out as part of renovation projects, these must be completed long in advance of the installation of DASATOP.

Airtight seals can only be achieved on vapour control (alternate terms: vapour check or retarder) membranes that have been fitted with no folds or creases.

If blown-in insulation is used, DASATOP must be installed directly onto the entire area of the inner cladding.