SMARTPLY PROPASSIV achieves Passive House Institute recommendation for airtightness

Following extensive testing by independent research body the Passive House Institute, the new SMARTPLY PROPASSIV structural OSB panel has achieved recommendation from the PHI for airtightness after it delivered the excellent result of a q50 value of < 0,03 m³/h/m² for airflow rate.
The Passive House Institute (PHI) plays a crucial role in the development of the Passive House concept – the only internationally recognised, performance-based energy standard in construction. To be recommended by the PHI, products must be tested according to uniform criteria and proven to be of excellent quality regarding energy efficiency.
As part of the testing process by PHI, SMARTPLY supplied nine samples measuring 315 x 305 x 12.5 mm – each coated at the edges with a sealing compound to reduce the influence of the small board size. Measurement of the leakage volume flow took place at pressures between 300 and 1000 Pa in order to obtain sufficiently high flow rates, while both positive and negative pressure measurements were carried out.
“OSB is assumed to be airtight, but tests showed 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 now been proven to achieve the highest levels of airtightness required to meet the Passive House Standard.”
Suitable for both new build and renovation projects, SMARTPLY PROPASSIV is a versatile, strong and cost-effective OSB panel system. And if the UK is to cut its carbon emissions in line with stringent building regulations, this latest OSB innovation will play a vital role as part of a highly sustainable and fabric first approach.

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