Hobart Net Zero in Massachusetts
Rebuild/DER on Martha's Vineyard
Project Photo Gallery
Project Team
Other Team Members
Local builder
This is a rebuild and Deep Energy Retrofit of a 1970's ranch with a full poured cement cellar, with a 1990's addition on concrete piers. The location, within the coastal zone, precluded any expansion of the footprint, but expansion upward was allowed. The original ranch was torn down to the first floor deck, preserving the cellar, and the addition was completely gutted, but left standing. The ranch was rebuilt into a two story house with SIPs, the addition was insulated, top, sides and bottom, with exterior nail base SIPs and interior fiberglass and the cellar was sealed with spray foam, foam panels and fiberglass. High efficiency windows, ventillation, minisplits, HP water heater, energy star appliances, LEDs and a monitored 5.36 KW PV system complete the package. The house is totally electric, and has a Net electric meter, tied to the grid. The HERS rating is 22.
Quick Facts
General
Location
Edgartown, Massachusetts
Building Type
Single family residence
Project Type
Zero Energy Ready / Near Zero Energy
Basis of Performance Claim
Modeled, Verified
Bedrooms
4
Bathrooms
3.5
Conditioned Floor Area
2,700 sq ft
Total Cost of Project
$1,000,000
Energy Summary
Energy Data Type
Modeled, Verified
Renewable Energy System Type(s)
Photovoltaics
Ratings
HERS Index
22
Net electricity usage (purchased)
2,910 kWh/year
Annual renewable energy generated
7,741 kWh/year
Envelope and Mechanicals
Subslab assembly
slab was pre-existing poured concrete. Was insulaed with 2 inches of foam panels covered with 1.5 inches plywood.
Foundation wall assembly
preexisting poured concrete. Covered with 3 inches of foam panels, 3.5 inches of fiberglass and .75 inches of plywood. Rim joists were spray foamed to 4 inches.
Above grade wall assembly
Same as foundation wall
Door Assembly
Same as windows; 7 full glass doors
Air Changes per hour, ACH50
0.46 ACH50
Project Photo Gallery
Project Team
Other Team Members
Local builder
This is a rebuild and Deep Energy Retrofit of a 1970's ranch with a full poured cement cellar, with a 1990's addition on concrete piers. The location, within the coastal zone, precluded any expansion of the footprint, but expansion upward was allowed. The original ranch was torn down to the first floor deck, preserving the cellar, and the addition was completely gutted, but left standing. The ranch was rebuilt into a two story house with SIPs, the addition was insulated, top, sides and bottom, with exterior nail base SIPs and interior fiberglass and the cellar was sealed with spray foam, foam panels and fiberglass. High efficiency windows, ventillation, minisplits, HP water heater, energy star appliances, LEDs and a monitored 5.36 KW PV system complete the package. The house is totally electric, and has a Net electric meter, tied to the grid. The HERS rating is 22.
Quick Facts
General
| Location | Edgartown, Massachusetts |
|---|---|
| Building Type | Single family residence |
| Project Type | Zero Energy Ready / Near Zero Energy |
| Basis of Performance Claim | Modeled, Verified |
| Bedrooms | 4 |
| Bathrooms | 3.5 |
| Conditioned Floor Area | 2,700 sq ft |
| Total Cost of Project | $1,000,000 |
Energy Summary
| Energy Data Type | Modeled, Verified |
|---|---|
| Renewable Energy System Type(s) | Photovoltaics |
| Ratings | |
| HERS Index | 22 |
| Net electricity usage (purchased) | 2,910 kWh/year |
| Annual renewable energy generated | 7,741 kWh/year |
Envelope and Mechanicals
| Subslab assembly |
slab was pre-existing poured concrete. Was insulaed with 2 inches of foam panels covered with 1.5 inches plywood. |
|---|---|
| Foundation wall assembly |
preexisting poured concrete. Covered with 3 inches of foam panels, 3.5 inches of fiberglass and .75 inches of plywood. Rim joists were spray foamed to 4 inches. |
| Above grade wall assembly |
Same as foundation wall |
| Door Assembly |
Same as windows; 7 full glass doors |
| Air Changes per hour, ACH50 | 0.46 ACH50 |