SMARTPLY PROPASSIV sets industry-first standards for airtightness

SMARTPLY is set to revolutionise the way timber frame structures are designed and built with its latest technological innovation – the SMARTPLY PROPASSIV structural OSB panel. With integrated vapour control properties and airtightness engineered into each panel, SMARTPLY PROPASSIV has performed six times better than PassivHaus standard for air leakage, making it the ideal panel system for ultra-low energy buildings.

The result of three years of rigorous development by SMARTPLY and extensive testing at the Fraunhofer Institute for Building Physics, SMARTPLY PROPASSIV is recommended by the Passive House Institute as a product for providing airtightness. Each panel features alternating layers of wood strands coated with a high quality formaldehyde-free resin and wax to deliver outstanding levels of airtightness. A specialist coating is then applied to add vapour resistance and provide a premium performance OSB solution for super-insulated and passive buildings.

“OSB is assumed to be airtight, but tests prove a huge variation in performance, between manufacturers and even between different production cycles,” explains David Murray, Innovation Manager at MEDITE SMARTPLY “Developed from our OSB3 system, SMARTPLY PROPASSIV has integrated vapour control and unrivalled air barrier properties and will help to close the gap between design and as-built performance.”                           

Available in a standard 2397mm x 1197mm size, the panel uses a newly developed high performance coating to ensure consistently high vapour resistance across its entire surface. The smooth and durable surface has also been developed to provide superior bonding of airtight tape at panel joints. Where air and vapour control layer (AVCL) membranes are notoriously difficult to seal, SMARTPLY PROPASSIV offers excellent seal adherence to prevent air leaks, condensation and structural damage.

Manufactured from FSC-certified timber to the specification detailed in

BS EN 300:2006, the rigid panel is a sustainable, robust and cost-effective alternative to specialist AVCL membranes. With minimal risk of damage during assembly, transport and installation, airtightness should not be compromised thereby ensuring the panel performs as well on the construction site as in factory controlled conditions.

By the very nature of the product, SMARTPLY PROPASSIV can also reduce waste and man hours, as site applied, or factory applied, air and vapour control layers are not required. The panels can be readily cut and fixed using standard timber frame fixings, removing the need for additional membranes, sealants and foams.

Suitable for both new build and renovation projects, SMARTPLY PROPASSIV is a versatile, strong and cost-effective OSB panel system. If the UK is to meet its target of an 80% cut in carbon emissions by 2050 with all new homes built to be ‘zero carbon’, SMARTPLY'S latest innovation could play a vital role as part of a highly sustainable and fabric first approach.

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