Hobart Net Zero in Massachusetts
Rebuild/DER on Martha's Vineyard
Completion
Completion date 11/01/2014
Occupancy
Owner occupied; 2 occupants full time. Occasional house guests: 4 for 2-3 weeks per year
Days per year Building is fully occupied: 365
Scope
Original 1970's single story ranch (with full cellar) with 1990's one room addition with porch, on pilings. Ranch was demolished to first floor deck, cellar was preserved. One room addition was gutted to studs, floor and roof, and porch removed.
Type of Construction
New, Retrofit
Number of buildings
1
Floor area of each building
3,100
Bedrooms
4
Bathrooms
3.5
Stories
2
Conditioned Building Volume
23,000 cu ft
Conditioned Floor Area
2,700 sq ft
Unconditioned Floor Area
1,000 sq ft
Location and Climate Details
Single family residence
Address
39 Sengekontacket Road
Edgartown, MA 02539
United States
Location Type
Suburaban
Climate Region
Zone 5
Köppen Climate Type
Cfb
Lat. / Long.
POINT (-70.5728337 41.4192946)
Elevation
12 ft
Solar Insolation
3.74 KWh/m2/day Annual Average
Annual CDD and Base Temp
41 Ave over las 5 years | 78 deg F
Annual HDD and Base Temp
5600 | 65 deg F
Site
Site conditions: previously developed land, wetlands, lake/pond,, sensitive habitat, preexisting structure(s)
Site description: The house is on a ~.85 acre lot on a peninsula including a tidal salt marsh and on the edge of a salt pond, totally within the coastal zone.
Materials and Design Strategy
Special Materials: As it is in the coastal zone, no increase in footprint was allowed; a variance was obtained for a slight increase in height, to allow a second floor. Local regulations limit the amount of fertilizer which can be applied per year; we actually apply none, using native plants. The existing cellar and pilings were preserved and minimal excavation was done to install a nitrogen reduction septic system.
Special Architectural Measures: South facing window area, along long axis of house, was maximized; other exposures were minimized. All windows have overhangs which minimize heat gain in summer but allow maximum heat gain in winter. Window SHGC is 0.440, U factor is 0.150. Windows were installed with foam and taped around the edges. Windows are hurricane glassed. House walls are about R-45, roof is R-65. The ranch is build with SIPs and the (gutted) addition is sheathed with nail-base SIPs. Cellar was foam paneled and the rim joists were spray foamed. Blower door testing revealed it met the Passiv Haus standard for air infiltration.
LCA Description: No
Indoor Environment Description: There is a Zender 550 ERV system set to 125 cfm for the house.
Completion
Occupancy
Owner occupied; 2 occupants full time. Occasional house guests: 4 for 2-3 weeks per year
Scope
Original 1970's single story ranch (with full cellar) with 1990's one room addition with porch, on pilings. Ranch was demolished to first floor deck, cellar was preserved. One room addition was gutted to studs, floor and roof, and porch removed.
| Type of Construction | New, Retrofit |
|---|---|
| Number of buildings | 1 |
| Floor area of each building | 3,100 |
| Bedrooms | 4 |
| Bathrooms | 3.5 |
| Stories | 2 |
| Conditioned Building Volume | 23,000 cu ft |
| Conditioned Floor Area | 2,700 sq ft |
| Unconditioned Floor Area | 1,000 sq ft |
Location and Climate Details
Single family residence
| Address |
39 Sengekontacket Road Edgartown, MA 02539
United States |
|---|---|
| Location Type | Suburaban |
| Climate Region | Zone 5 |
| Köppen Climate Type | Cfb |
| Lat. / Long. | POINT (-70.5728337 41.4192946) |
| Elevation | 12 ft |
| Solar Insolation | 3.74 KWh/m2/day Annual Average |
| Annual CDD and Base Temp | 41 Ave over las 5 years | 78 deg F |
| Annual HDD and Base Temp | 5600 | 65 deg F |
Site
The house is on a ~.85 acre lot on a peninsula including a tidal salt marsh and on the edge of a salt pond, totally within the coastal zone.
Materials and Design Strategy
As it is in the coastal zone, no increase in footprint was allowed; a variance was obtained for a slight increase in height, to allow a second floor. Local regulations limit the amount of fertilizer which can be applied per year; we actually apply none, using native plants. The existing cellar and pilings were preserved and minimal excavation was done to install a nitrogen reduction septic system.
South facing window area, along long axis of house, was maximized; other exposures were minimized. All windows have overhangs which minimize heat gain in summer but allow maximum heat gain in winter. Window SHGC is 0.440, U factor is 0.150. Windows were installed with foam and taped around the edges. Windows are hurricane glassed. House walls are about R-45, roof is R-65. The ranch is build with SIPs and the (gutted) addition is sheathed with nail-base SIPs. Cellar was foam paneled and the rim joists were spray foamed. Blower door testing revealed it met the Passiv Haus standard for air infiltration.
No