Brown House Road

Preferred Builders knows a thing or two about spec homes, especially the well appointed, heavily-adorned variety usually found in the Greenwich real estate pages. Peter Fusaro, however, noticed a recent shift in attitude and traded excessive millwork and moulding for efficient assemblies and HVAC. Prospective buyers need not worry about what’s behind the walls (R7.5 rigid wrapping the exterior plus R21 Blown in Batt in studs) or in the mechanical room (SEER 16.5 A/C plus .94 EF condensing boiler) because the sleek kitchen, beautiful entry, and open living area are still the main attractions.

As the second home in the country to earn the U.S. Department of Energy Challenge Home certification, “The Performance House” also boasts LEED for Homes Platinum, NGBS Emerald, the EPA’s Energy Star v3.0, Indoor airPLUS, and WaterSense certifications. The home took second place in the 2012 CT Zero Energy Home Challenge, received the 2011 Spec Home of the Year Award from Home Builders & Remodelers Association of CT (HOBI), and the 2013 Merit Award from the CT Green Building Council. Also trained as a HERS Rater and NGBS verifier, Mr. Fusaro understands the merits of third-party verification and hired Steven Winter Associates, Inc. (SWA) as the provider and rater for the certification and labels.

Wherever possible low VOC, recycled content, reclaimed, and recyclable materials were chosen. A small (75 kBtuh) condensing natural gas boiler for heat and hot water, and a modest 1.5-ton central-air system were installed. Occupants are unlikely to realize that the luxurious plumbing fixtures are low flow and will never have to wait for hot water thanks to the on-demand delivery systems. With high efficiency features alone, the home reached HERS Index 43, representing 37% savings over current code. A 6.6 kW PhotoVoltai system neatly tucked on the south facing roof drops the Index to 20 (80% below code) and provides a renewable source for the electric car charging station.

 

 

Quick Facts

General

Location
23 Brown House Road
Old Greenwich, CT
United States
Building Type single-family residence
Project Type Zero Energy Ready / Near Zero Energy
Basis of Performance Claim
Bedrooms 5
Conditioned Floor Area 3 671

Energy Summary

Energy Data Type Modeled,
Renewable Energy System Type(s) Photovoltaics,
Ratings

LEED for Homes Platinum, NGBS Emerald, the EPA’s Energy Star v3.0, Indoor airPLUS, and WaterSense certifications.

Annual renewable energy generated

Envelope and Mechanicals

Subslab assembly

There is 3” closed cell foam insulation with R value of 20 under entire slab and along the vertical stem wall.

Foundation wall assembly

There is 2.5” closed cell foam insulation with R value of 15 against foundation walls behind the studs.

Above grade wall assembly

There is 1.5” rigid foam board exterior insulation with R value of 7.5 were used plus Blown-In-Blanket System (BIBS) with R value of 20 was used in between the two by six wall studs.

Door Assembly
Air Changes per hour, ACH50 1.01
Brown House Road Boiler room Roof Solar panels Bathroom Bathroom

Project Team:

Energy Consultant

Other Team Members:

Ratings:

LEED for Homes Platinum, NGBS Emerald, the EPA’s Energy Star v3.0, Indoor airPLUS, and WaterSense certifications.

Awards:

2011 Spec Home of the Year Award from Home Builders & Remodelers Association of CT (HOBI), and the 2013 Merit Award from the CT Green Building Council.

Completion

Completion Date: Sunday, October 16, 2016

Scope

Type of Construction New,
Number of buildings 1
Floor area of each building 3 671
Bedrooms 5
Stories 2
Conditioned Building Volume 37 373
Conditioned Floor Area 3 671

Location and Climate Details

single-family residence

Address
23 Brown House Road
Old Greenwich, CT
United States
Location Type Suburaban
Climate Region Zone 5
Köppen Climate Type
Lat. / Long. POINT (-73.5645753 41.0370625)
Elevation 27
Solar Insolation
Annual CDD and Base Temp 789 | 65 deg F
Annual HDD and Base Temp 5466 | 65 deg F

Site

Site Conditions:

previously developed land,

Site Description:

Nicknamed “The Performance House,” this five bedroom 2,670 square foot house in Old Greenwich is on a small 7,510 square foot lot with tight setbacks, oriented for southern exposure.

Monthly Energy Data and Utilities

Energy Data Type:

Electric Utility:

Gas Utility:

Renewables and Energy Balance

Renewable Energy Sources:Renewable energy is generated within the building footprint (e.g. solar PV on the roof),

Renewable Energy System Description & Details: This home will be using a 5kW grid-tied photovoltaic (PV) system to offset the electrical load.

Annual renewable energy generated
Annual Renewable Energy Generated Data Type Modeled,
Power Rating 5 000Watts
Renewable Energy System Type(s) Photovoltaics,
Source of Annual Production Data

Walls and Roof

Subslab assembly

There is 3” closed cell foam insulation with R value of 20 under entire slab and along the vertical stem wall.

Subslab R-value 20.00
Slab edge assembly
Slab edge R-value 20.00
Foundation wall assembly

There is 2.5” closed cell foam insulation with R value of 15 against foundation walls behind the studs.

Foundation wall R-value 15.00
Above grade wall assembly

There is 1.5” rigid foam board exterior insulation with R value of 7.5 were used plus Blown-In-Blanket System (BIBS) with R value of 20 was used in between the two by six wall studs.

Above grade wall R-value 27.50
Cathedral ceiling assembly

There is 5.5” closed cell spray foam was sprayed with R value of 37 as well as foil faced fiberglass batt with R value of 13.

Cathedral ceiling R-value 50.00

Windows and Doors

Window Assembly:

Marvin Integrity windows were chosen for durability and performance to meet ENERGY STAR Version 3.0 requirements.  With a 0.28 U-Value, the continuous seal and patented window frame reduces thermal bridging and condensation.  South side glazing will have a higher SHGC to allow heat gain in the winter months.

Door Assembly:

Average window U-factor 0.28
Door U-Factor
Door Area

Mechanical Systems

Space cooling - Manufacturer & Model Carrier Infinity condenser units ,
Space heating - Manufacturer & Model Natural gas fueled air distribution: Buderus ultra efficient wall-mounted boiler with a Grundfos Alpha Circulation pump. ,
Domestic hot water - Manufacturer & Model two on-demand tankless hot water heaters with a 0.93 Energy Factory (EF).
Domestic hot water - capacity
Ventilation - Manufacturer & Model UltimateAir reoupAerator ERV ,
Lighting Manufacturer and Model LED ,
Lighting Efficiency
Mechanical Equipment Installation Details and Comments

Heating will be provided by a natural gas Buderus ultra efficient 96% AFUE wall-mounted boiler with a Grundfos Alpha Circulating pump.  This sealed combustion unit was chosen to eliminate the possibility of back drafting which will support the indoor air quality.  Carrier hot water coils and Carrier air handlers will be built into this hydro-air system.  For cooling, Carrier Infinity condenser units with efficiency of SEER 16.5/EER 13.5 were chosen.  Domestic hot water will be supplied by two on-demand tankless hot water heaters with a 0.93 Energy Factory (EF).

Envelope

Air Changes per hour, ACH50 1.01
Air Changes per hour, CFM50

General Process

Design for Adaptability:

Software Tools

Software Tools:

General modeling information:

Lessons Learned

Outcome of Project Goals:

Discrepancies:

Rebates and Financial Incentives

Federal incentives
Local incentives
State incentives
Utility incentives
Other incentives
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