PROVAC, Protan’s unique single ply roofing system, utilises wind forces present in the environment to provide durability and protection even in extreme conditions. Since the installation of the first Norwegian vacuum roof in 1985, the system has been adopted for over 2 million square metres of roofs throughout Europe.
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PROVAC works by loose laying the Protan SE membrane onto the roof with fastening only around the perimeters and penetrations. Strategically located vents within the design act as pressure release valves. The stronger the wind forces, the better the system works. The system is suitable for both new roofs and refurbishments, in particular those with structural concrete or concrete slab decks.
A key component is an airtight load-bearing vapour control layer. The system introduces controlled airflow beneath the membrane through specially designed air valves. Due to the nature of the design principle, the substrate must be airtight.
PROVAC offers many benefits to the specifier, contractor and building owner: |
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Sustainable and energy efficient:
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The system is adhesive free so there is neither toxic waste nor consequent health risk to the installer
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The airtight fit helps achieve and can exceed Part L regulations. Only mineral wool insulation is suitable for the PROVAC system due to its airflow dynamics
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Protan and Rockwool have a long working history with roofs covering millions of square metres installed across Scandinavia and Europe
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The supporting structures and vapour control layer are not penetrated by fasteners
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Upon expiry of its minimum 30-year lifespan, the membrane is easily recycled along with the Rockwool insulation
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Protan provides a full system warranty with its insulation partner Rockwool covering all materials above the structural deck including the fire resistant insulation
Cost-effective:
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No fasteners ensures rapid installation with reduced labour time, contributing to a reduced construction programme – particularly important when installing on concrete substrates
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Cost saving is possible, depending upon the geometry of the building. Early consultation with Protan will ensure the optimal design for the roof. Various shapes can be accommodated, from flat to barrel vault.
Complete solution:
The PROVAC system is individually designed to suit the intended roof minimising any waste. Consultation with Protan will ensure the optimum design and maximum savings in terms of installation time and material costs. Protan’s experience with prefabricated offsite projects enables its expertise to be used in the PROVAC system. Protan’s prefabricated components include:
- Up to 4m wide membrane sheets
- Internal/external corner details
- Drainage outlets
- Mansafe systems
- Membrane laminated metal edge trims
Along with technical guidance, Protan can provide design details and CAD drawings with technical approval from the Norwegian Building Research Institute (NBI).
