The specification from Ecoarc employed materials locally sourced from Ecological Building Systems, products with a track record for delivering to the passivhaus standard.
Closed insulated panels were manufactured in Eden Insulation’s Appleby factory comprising:
- 300 I beam wall stud sheathed externally with 40mm Gutex Multitherm and Fronta Humida membrane.
- Racked internally with Spano Durelis Vapour Barrier board with 50mm service cavity. All board joints taped with Tescon No 1 in the factory.
- All panels injected with Warmcell cellulose fibre to over 60Kgm3.
The house comprised only four panels at ground floor and further four panels at first floor. The four metal web joist floor cassettes were supported on an internal bearer to facilitate airtightness. The roof trusses were placed on the first day and sheathed and protected with a membrane on the second day. The ceiling to the underside of the trusses was formed using Spano Durelis Vapour Barrier board with 50mm service cavity.
The great majority of the airtightness taping to the walls had been completed in the factory leaving only the corners and joint between ground floor & first floor panels to complete. The Main Contractor taped the frame to wall plate joint post window & door fitting by Internorm in dry & warm conditions.
The preliminary airtightness test formed part of the Eden Insulation Contract and pleasingly returned a result of 0.11 demonstrating that offsite, crane erected panels can be one route used to achieving the Passivhaus standard and certification.