Sandywoods Farm Net Zero Spec House #1
Lot 8 Sandywoods Farm Net Zero
Project Photo Gallery
Other Team Members
Church Community Housing Corporation, Northeast Collaborative Architects, NPTRE (Newport Renewables), UG Nasons HVAC, FOARD Panels, Bodington Plumbing, Ecologic Insulation, Foster Electric
Ratings, Awards and Recognition
This is the first of two Net Zero houses built on spec by Church Community Housing in the market rate portion of a mixed-income, mixed-use, arts and agricultural community called Sandywoods Farm. The development includes 50 Affordable apartments in single family and duplex buildings and 17 unsibsidized market rate lots for sale. The two Net Zero spec houses have been built in the hope that it will stimulate the sale and development of the other lots and that it will set a precedent for energy efficient home construction that will be followed by the purchasers of those lots. Furthermore, the Town of Tiverton where Sandywoods Farm is located has a relatively high property tax rate relative to the surrounding communities. It is hoped that the Net Zero houses would compete favorably with spec houses for sale in those communities by offsetting the higher taxes with low/no utility costs. Lastly, Church Community Housing has long been dedicated to increased energy efficiency, renewable energy development and sustainable and healthy building materials and practices. The construction of these Net Zero houses was simply the next step in a long road of ever increasing residential construction performance. The houses stats are: R-60 SIP Roof, R-50 .8 lb open cell spray foam 12" double stud walls, R-15 closed cell spray foam under the basement slab, R-20 closed cell spray foam on interior of basement walls, R-50 open cell spray foam in rim joist. Triple glazed, low-E, Krypton gas filled windows and sliding glass door achieving .20 or better U-value. Super high efficiency "hyper heat" Fujitsu mini-split HVAC system: one floor mounted 15,000 btu unit on first floor, one compact ducted 12,000 btu unit on 2nd floor. Less than 1 ACH @ 50 Pascals. Panasonic programable bath fans in both bathrooms set to run continuously based on results of blower door test to ensure healthy indoor air quality. Tier II vapor retarder interior primer and gasketed electrical boxes to prevent vapor drive through wall assembly. Electric heat pump hot water tank for domestic hot water. 9kw PV array atop south facing roof.
Quick Facts
General
Location
Tiverton, Rhode Island
Building Type
single-family residence
Project Type
Zero Energy
Basis of Performance Claim
Modeled
Bedrooms
4
Bathrooms
2.0
Conditioned Floor Area
1,372 sq ft
Total Cost of Project
$368,059
Energy Summary
Energy Data Type
Modeled
Renewable Energy System Type(s)
Photovoltaics
Ratings
The house will receive a HERS rating upon completion as a result of it's enrollment in the Energy Star Certification program. Initial modeling showed a HERS of 4 - before installation of the larger PV array and higher density spray foam in the walls. The house is expected to achieve a negative HERS rating (net energy exporter) upon completion.
HERS Index
4
Annual renewable energy generated
10,890 kWh/year
Envelope and Mechanicals
Subslab assembly
R20 closed cell spray foam sprayed on top of 3/4 stone under concrete basement floor slab.
Foundation wall assembly
closed cell foam sprayed to R20 on inside of foundation walls
Above grade wall assembly
12" double stud walls filled with open cell spray foam insulation.
Door Assembly
Sliding glass door is from same Harvey Tribute line with same spec's as windows. Entry doors are Therma-Tru Classic Craft models
Air Changes per hour, ACH50
1.00 ACH50
Project Photo Gallery
Other Team Members
Church Community Housing Corporation, Northeast Collaborative Architects, NPTRE (Newport Renewables), UG Nasons HVAC, FOARD Panels, Bodington Plumbing, Ecologic Insulation, Foster Electric
Ratings, Awards and Recognition
This is the first of two Net Zero houses built on spec by Church Community Housing in the market rate portion of a mixed-income, mixed-use, arts and agricultural community called Sandywoods Farm. The development includes 50 Affordable apartments in single family and duplex buildings and 17 unsibsidized market rate lots for sale. The two Net Zero spec houses have been built in the hope that it will stimulate the sale and development of the other lots and that it will set a precedent for energy efficient home construction that will be followed by the purchasers of those lots. Furthermore, the Town of Tiverton where Sandywoods Farm is located has a relatively high property tax rate relative to the surrounding communities. It is hoped that the Net Zero houses would compete favorably with spec houses for sale in those communities by offsetting the higher taxes with low/no utility costs. Lastly, Church Community Housing has long been dedicated to increased energy efficiency, renewable energy development and sustainable and healthy building materials and practices. The construction of these Net Zero houses was simply the next step in a long road of ever increasing residential construction performance. The houses stats are: R-60 SIP Roof, R-50 .8 lb open cell spray foam 12" double stud walls, R-15 closed cell spray foam under the basement slab, R-20 closed cell spray foam on interior of basement walls, R-50 open cell spray foam in rim joist. Triple glazed, low-E, Krypton gas filled windows and sliding glass door achieving .20 or better U-value. Super high efficiency "hyper heat" Fujitsu mini-split HVAC system: one floor mounted 15,000 btu unit on first floor, one compact ducted 12,000 btu unit on 2nd floor. Less than 1 ACH @ 50 Pascals. Panasonic programable bath fans in both bathrooms set to run continuously based on results of blower door test to ensure healthy indoor air quality. Tier II vapor retarder interior primer and gasketed electrical boxes to prevent vapor drive through wall assembly. Electric heat pump hot water tank for domestic hot water. 9kw PV array atop south facing roof.
Quick Facts
General
Location | Tiverton, Rhode Island |
---|---|
Building Type | single-family residence |
Project Type | Zero Energy |
Basis of Performance Claim | Modeled |
Bedrooms | 4 |
Bathrooms | 2.0 |
Conditioned Floor Area | 1,372 sq ft |
Total Cost of Project | $368,059 |
Energy Summary
Energy Data Type | Modeled |
---|---|
Renewable Energy System Type(s) | Photovoltaics |
Ratings |
The house will receive a HERS rating upon completion as a result of it's enrollment in the Energy Star Certification program. Initial modeling showed a HERS of 4 - before installation of the larger PV array and higher density spray foam in the walls. The house is expected to achieve a negative HERS rating (net energy exporter) upon completion. |
HERS Index | 4 |
Annual renewable energy generated | 10,890 kWh/year |
Envelope and Mechanicals
Subslab assembly |
R20 closed cell spray foam sprayed on top of 3/4 stone under concrete basement floor slab. |
---|---|
Foundation wall assembly |
closed cell foam sprayed to R20 on inside of foundation walls |
Above grade wall assembly |
12" double stud walls filled with open cell spray foam insulation. |
Door Assembly |
Sliding glass door is from same Harvey Tribute line with same spec's as windows. Entry doors are Therma-Tru Classic Craft models |
Air Changes per hour, ACH50 | 1.00 ACH50 |