Passive House Granbäck

Paroc’s first Passive House pilot in Sweden, officially called “Passive House Granbäck” is located in Vallentuna, appr. 20km North from Stockholm.

“Passive House Granbäck” is a wooden framed two-storey detached single family house, which is built in two phases. Phase one has a net floor area of 105m2 and phase 2 95m2, resulting total net floor area of 200m2.

External wall construction is so called double wooden stud frame, which consist of two wooden stud frames: Outer 170mm wide load bearing insulated frame and inner 70mm wide non-load bearing insulated frame with appr. 170mm insulation between outer and inner frames. On external face of the 170mm load bearing frame is 50mm Paroc FAS insulation slab with render or 50mm Paroc WAS insulation slab, ventilation gap and wooden panel.

Floor construction is based on app. 100mm concrete slab on the ground with 300mm thick layer of Paroc GRS 30 insulation slabs underneath.

Sloping roof construction consist of 500mm deep wooden I-Joists with Paroc BLT 1 blowing wool and cross-laid 50 x 50 timber frame attached on the lower flange of the I-Joist with 50mm Paroc UNS 37 insulation slab.

Some design data

U-values:    External wall: 0.09W/m2K
Roof: 0.07 W/m2K
Floor: 0.10 W/m2K
Windows: 0.9 W/m2K
Doors: 0.84 W/m2K

Average ventilation: 0.5 1/h
Heat recovery rate: 85…90 %
Air tightness:    n50: 0.18 1/h (measured value)

Heating energy demand
≤15kWh/m2, a (space heating)

Construction Phase

Project was started in 2007 and the first phase (105m2) was ready in January 2008 and the occupants have already moved in. Next phase (95m2) will start during 2008.
› See Construction Phases

Other

“Passive House Granbäck” is the first Paroc Passive House Pilot ever. For more information about this pilot, please log on to www.granback.se.