DASATOP

Areas of application

The pro clima DASATOP vapour check (alternate terms: vapour control or retarder) membrane, which can be subjected to outdoor exposure, can be used on refurbishment projects as follows:

• For the particular method of ‘sub-and-top’ roof refurbishment from the outside; this membrane is optimised for installation into the spaces between the rafters and over the rafters
• On residential buildings or buildings with residential-like use, in all rooms such as living rooms, bedrooms, kitchens and bathrooms
• On structures that are open to diffusion on the outside
• Insulation cover with PU (fleece-laminated) of at least 50 mm (2") possible

Possible combinations of insulation materials

Optimal protection for building structures can be achieved with the DASATOP system if the following conditions are met:

• External roof insulation with fibrous insulation material
• Roofing underlay membranes that are open to diffusion on the outside (e.g. the SOLITEX MENTO series), also over roof sheathing, and
• Wood-fibre or MDF underlay panels

Covering with at least 50 mm (2") of PU external roof insulation (fleece-laminated) is possible (no aluminium backing). A combination with foam insulation materials should only be used as a covering if: - Drying out of the structure to the outside is ensured, and - This combination is installed in the pitched roof area, but not on uppermost ceilings/floors underneath unheated attic spaces

In general, pro clima DASATOP cannot be used on structures that have diffusion-tight component layers on the outside.

4 weeks of outdoor exposure

pro clima DASATOP can be subjected to outdoor exposure for up to 4 weeks to protect the building structure. Please note that DASATOP does not provide sealing that is equivalent to an emergency roof. Moisture can enter at staples or other perforations (nails, screws etc.). Drainage of water across adjacent building components (e.g. sill plates) must be ensured. Additional covering with tarpaulins is recommended for buildings that people are still living in or that are particularly worthy of protection (e.g. historical or listed buildings).

Use possible on structures that are open to diffusion on the outside

Diffusion-open roofing underlay membranes (e.g. SOLITEX roofing membranes) protect the structure during the construction phase and provide the required windtightness. They can also be installed onto solid-wood boarding. Permeable underlay panels made of wood-based products can be added to any arbitrary thickness above the rafters.

Inner cladding

In principle, all inner claddings typically used in construction are permitted. Excluded are building components with additional external roof insulation with foam insulation materials (slow diffusion behaviour). In this case, no diffusion-inhibiting layers such as OSB or multi-layer wooden panels may be positioned on the inside of the insulation so as to ensure reliable drying out.

Increased indoor humidity

The diffusion resistance of pro clima DASATOP has been designed to ensure that there is a reliable vapour-checking effect in the case of typical indoor humidities, even in bathrooms and kitchens. DASATOP can be installed on construction sites where no significant plastering or screed work is being carried out.

Quality assurance

In the case of membrane installation on the exterior, efficient quality assurance can be carried out during the course of construction by means of differential pressure testing with overpressure and artificial fog. As part of this testing, fog is generated inside the building using a fog machine. In this way, the airtightness of detail features can be checked and rectified on the exterior. The membranes must be mechanically secured to a sufficient extent beforehand. For this reason, adhesive taping and all joints are to be implemented with particular care.

Detailed construction planning – particularly of joints at the eaves and gable ends and the implementation of these joints on roof refurbishment projects – is particularly important. In Germany, this quality assurance during the course of construction is no substitute for final testing of airtightness in accordance with the German Building Energy Act (GebäudeEnergieGesetz, GEG) or the requirements of the German Reconstruction Loan Corporation (KfW) regarding the determination of the air change rate (n₅₀ value).

Technical support

If you have questions relating to planning and installation, please contact pro clima Technical Support.