Cellulose insulation improves airtightness by 30% — PYC Systems
In October 2015, PYC Systems carried out the first of several air tests at the Hilltop project in Richard’s Castle on the Hertfordshire— Shropshire border, Architype’s first small scale residential passive house project. The first blower door test result was 0.59 air changes per hour (ACH), prior to insulating the envelope, which everyone was keen to improve on as it only marginally passed the passive house standard and was prior to fitting services, which are known to increase the risk of air leaks.