Passive House Modern: Zero Energy Ready Certified & Passive House


Passive House Modern: Zero Energy Ready Certified & Passive House2018-08-09T13:12:06+00:00

Project Description

This is a five bedroom, four full and one half-bath home that was built for a private client and his family. An existing home in poor condition was demolished prior to construction. Our client wanted the home to achieve net zero and Passive House performance levels, without formal Passive House certification. Based on the first year’s electric bills, the home is performing as expected at a level very close to net zero. The homeowners could choose to achieve net zero performance with a small addition to the solar PV system at any point in the future.

Special Features:

  • Open-concept living layout
  • 5” white oak floors
  • Built-in shelving throughout
  • Custom kitchen and bathroom cabinetry
  • En-suite master bedroom and bath
  • Finished and fully conditioned basement

Green Building Approaches:

  • Right side of house faces solar south to capture winter heat.
  • 1,036sf of east, south, and west-facing windows capture roughly half the energy required for space heating
  • 10.72kw PV panels on the roof should provide more energy than the annual operating needs
  • 8” of EPS rigid foam board insulation under the slab
  • 3” of continuous closed-cell (low GWP) spray foam insulation applied to basement walls
  • 3.5” of dense-pack cellulose between 2×4 studs on interior face of basement walls
  • 2×4 double wall framing to practically eliminate thermal bridging
  • 2” of closed-cell spray foam applied to interior face of exterior wall sheathing
  • Exterior sheathing includes 1” of polyiso rigid foam insulation to further reduce thermal bridging
  • 8.5” of dense-pack cellulose insulation completes exterior wall insulation
  • Attic floor is insulated with 24” of dense-pack cellulose
  • Acrylic sheathing tapes used to achieve exceptional air-tightness of 0.40 ACH50
  • European triple-glazed aluminum-clad wood windows with u-values of 0.13 (roughly R-8)
  • Small ducted air-source heat pump system heats and cools the entire house
  • No central heating or cooling required
  • Heat pump water heater extracts heat from interior air
  • Energy recovery ventilation is delivered via a dedicated small diameter duct distribution system
  • Fiber cement siding installed over a drainage plane
  • Exterior trim made from recycled fly ash and rated for ground contact
  • 100% LED lighting
  • Low-flow water fixtures throughout

Project Details

Certifications:

  • Zero Energy Ready Home Certified
  • Built to Passive House standards*
  • Indoor Air Quality Plus Certified
  • Water Sense Certified
  • Energy Star Certified

    *Not formally certified at homeowners request

Awards:

  • Won first-ever residential: Westport [CT] Green Building Award for Achievement in Sustainable Design and Construction

Project Year:

2016

HERS Score:

11

Type of Home:

Modern

City:

Westport

State:

Connecticut

County:

Fairfield

Project Size:

7,900sf