Certified Passive House project

No. 1085
Project Gaddy Passive House
Status Pre-certified
Lead CPHC Michael Hindle
Builder Maryland Custom Builders Inc.
Location Clarksville, MD
Constr. type Timber
Bldg. function Single Family
Floor area 1,717 s.f.
Project type New Construction
HERS Index
Leed rating
Energy star rating
Heating degree days 4953
Cooling degree days 1220
Units 1
Exterior wall 2x6 structural wall with high density blown-in fiberglass, 1/2" plywood taped sheathing, 11 7/8" TJI with high density blown-in fiberglass, 1/2" densglass gold sheathing, 2" air space, 4" block below, 3/4" air space, galvalume corrugated siding above.
Floor 4" slab with 8" EPS Geofoam, thermal break, and insulated footings with foamglas.
Roof 16" TJI with high density blown-in fiberglass and 7.25" external mineral wool.
Window frame Thermotech: 0.17 U-value (picture window), 0.21 U-value (casement/awning window)
Window glazing Thermotech: 0.33 SHGC, 0.12 U-value (East-North-West casement/awning) 0.38 SHGC, 0.12 U-value (East-North-West picture) 0.67 SHGC, 0.16 U-value (South casement/awning) 0.66 SHGC, 0.16 U-value (South picture)
Entrance door Thermotech: 0.29 SHGC, 0.20 glazing U-value, 0.30 framing U-value
Ventilation Zendher ComfoAir 350
Heating system Two Mitsubishi Mr slim split-ductless heat pump
Domestic hot water Ecosmart Tankless hot water heaters.
Air tightness
Other (non-PH) Ecological Aspects
Annual heating demand 2.57 kBtu/(sf.yr)
Heat load 4.95 Btu/(sf.hr)
Primary energy requirement 36.4 kBtu/(sf.yr)
Construction costs
Cooling system Two 9000 Btu/hr Mitsubishi mini-splits, variable speed - one wall mounted in open plan living space and one ducted into bedrooms.
Architecture planning Miche Booz Architect
Mechanical systems designer John Essig
Additional consultants Janice Romanoski, Pando Alliance (LEED consulting), Peter Doo Living Building Challenge
Phius comments
Additional notes Targeted for LEED platinum, zero site energy, zero primary energy, Living Building Challenge
PE offset by PV array - 38.2 kBtu/sf/yr