Mini-B Passive House
The Mini-B project was developed by Joe Giampietro, Certified Passive House Consultant and Director of Housing at Johnson Braund Design Group, and was built by carpentry students at Seattle Central Community College/Wood Construction Center under the supervision of instructor Frank Mestemacher.
Students built the Mini-B from start to finish applying the principles of airtight construction and high-performance in all phases of the home’s construction:
· Placing high-performance windows appropriately for solar gain
· Installing insulation & air barrier that is almost 100% air-tight, with full-time 100% fresh air ventilation
· Utilizing building methods and materials to allow for passive solar heating
· Completing all the interior details
The Mini-B has a kitchenette, three-quarters bath, living/dining room, bed loft, closet, equipment loft with storage, solar hot water collector, and vaulted ceilings. It is one of the first houses in the State to be built to the Passive House energy conservation standard, and uses approximately 15% of the heating energy used by similar houses built to current Washington State Energy Code requirements. Once the last inspection and test is completed, Mini-B will be certified as a “Passive House” by the Passive House Institute U.S.
Wall & Roof Framing: 2x4 wood frame
Air Barrier System: Wet Flash liquid applied membrane over plywood sheathing
Siding: Recycled content fiber cement
Wall & Roof Insulation: Expanded Polystyrene foam, R-53
Windows: Serious 925 Series, UO .11, SHGC 0.47
Ventilation System: Ultimate Air Recouperator 200DX (new w/ lower cfm)
Domestic Hot Water System: Evacuated Tube w/ on demand Steibel Eltron Elect H/W
Heating System: Electric Resistance
Appliances & Lighting: ENERGY STAR
Flooring: Stained concrete lifetime
Other Sustainable Measures: Plumbed for a composting no-water toilet, low-VOC paints & finishes, metal roof suitable for rain water collection, NW sourced spruce wood cabinet facing & shelving, all plywood cabinet boxes
The Mini-B was on display and open for tours at the Phinney Neighborhood Center in Seattle for six months in 2011. It now has a permanent home at Clearwater Commons in Bothell, WA and will continue to be used as a demonstration project.