DA
Vapour check membrane for external insulation and roof refurbishment
Advantages
- Protects building structures against weathering during the construction phase for roof pitches of 10° (2.1:12) and higher
- Water-resistant and waterproof, can be walked on
- Acts as a vapour check and airtightness layer simultaneously
- Excellent values in hazardous substance testing, has been tested according to the ISO 16000 evaluation scheme
Areas of application
For use as a vapour check (alternate terms: vapour control or retarder) membrane and airtight membrane directly on top of sheathing underneath suitable external roof insulation made of all insulation materials on structures that are open to diffusion on the exterior (roofing underlay with SOLITEX MENTO 3000, for example).
In addition, DA can be used as an airtight membrane and refurbishment vapour check between two layers of insulation. All fibrous insulation materials can be used for insulation installed between rafters; the external roof insulation must be a foam insulation material (e.g. consisting of PUR, PIR or EPS). Please contact Technical Support at pro clima in Germany for assistance with calculating the thickness of the external foam insulation that is required from a building physics viewpoint. If necessary, the outer sealing layer should be implemented using a diffusion-open roofing underlay membrane (e.g. SOLITEX MENTO 3000).
Planning and construction guidelines
Areas of application
pro clima DA, which can be temporarily subjected to outdoor exposure, can be used:
- On roof sheathing, underneath over-rafter insulation
- On refurbishment projects from the outside between fibrous insulation materials in the space between the rafters and an insulation covering consisting of PUR, PIR or EPS, for example – after appropriate design calculations have been carried out
- As a membrane that can be walked on, such as underneath insulation layers in indoor areas – e.g. on the floor of a cold attic
- 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
3 months of outdoor exposure
pro clima DA can be subjected to outdoor exposure for up to 3 months to protect the building structure. In the case of roof refurbishment from the outside and installation between two layers of insulation, the outdoor exposure period is reduced to 14 days (7 days for ≤10 °C). Within this period, external roof insulation must be installed with the thickness required to provide moisture protection for the building component. Please contact Technical Support at pro clima in Germany for assistance with calculating the thickness of the external foam insulation that is required from a building physics viewpoint. The minimum roof pitch for outdoor exposure is 10° (2.1:12).
Please note that DA (connect) does not provide sealing that is equivalent to an emergency roof. Moisture can enter at staples or other perforations (nails, screws etc.). Additional covering with tarpaulins is recommended for buildings that people are living in or that are particularly worthy of protection.
Possible combinations
Optimal protection for building structures can be achieved using the DA system for the following combinations:
- External roof insulation with fibrous or foam insulation materials
- Roofing underlay membranes that are diffusion-open to the outside (e.g. those in the SOLITEX MENTO or SOLITEX WELDANO series), even if installed over sheathing
- Wood fibre or MDF underlay panels
In certain cases, structures must fulfil the requirements with regard to moisture protection for exemption from proof of performance as per the relevant standard or must be modelled using a suitable calculation method (e.g. Glaser method, time-dependent calculation methods). This applies particularly in the case of roof refurbishment from the outside between two insulation layers.
Use on structures that are open to diffusion on the outside
pro clima DA can be used with all commonly available diffusion-open roofing underlays. Excellent protection against moisture damage to structures can be achieved using the pro clima INTELLO X system in the case of structures that are impermeable to diffusion to the outside – such as bitumen felt on cladding or metal, flat or green roof structures.
Roof refurbishment from the outside
Insulation covering with foam insulation (e.g. PUR, PIR, EPS):
Between-rafter insulation consisting of fibrous insulation material. Insulation covering with foam insulation (e.g. PUR oder PIR).
- Roofing underlay membrane, e.g. pro clima SOLITEX MENTO 3000
- External roof insulation, e.g. PUR or PIR
- DA / DA connect
- Insulation between rafters / framework, fibrous
- Service cavity, if necessary
- Inner cladding
The thickness of the external foam insulation needs to be calculated on a project-specific basis. Please contact Technical Support at pro clima in Germany for assistance.
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 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.
