Parcel Area: 9,612 SF
Total Project Size: 7,883 SF
Site Conditions – Fronting on Marcella Ave., Highland St., and Fulda St., the site gradually slopes up from Marcella Ave. to Fulda St. The site is vacant however records from 1899 show a multiple residential buildings tight fitted on the site.
Adjacent Uses – Residential uses with one, two, three, and multi-family wood frame buildings surround the site. Across Marcella St. is the Connolly Playground, a tree edged neighborhood park with sport fields, courts, play structures and passive use areas.
Zoning – 3F-4000 / 2F-5000, as shown on Map 6D of the Boston Zoning Maps in the Roxbury Crossing District.
Developer/Design Manager: Urbanica, Inc
Architect of Record: Urbanica Design
Design Architect: Interface Studio Architects
LEED Consultant: Interface Studio Architects
Energy Consultant: Conservation Services Group
Green Rate/LEED for Homes Provider: Conservation Services Group
Mechanical Engineer: Engineering Design Build
A POSITIVE smaller footprint
Create a low-cost, energy-positive, and environmentally sustainable multi-family housing that stands as a model of responsible, contextual residential development.
Based in a holistic approach toward sustainability, using both low and high technologies in creative, efficient ways at all levels. However, it is the belief of the team that sustainability is not simply a technological fix, but a reconceptualizing of our outlook on the relationship between ourselves, the environment, and our lifestyle. The goal thus was to promote housing that actively engages residents with their local environment, neighborhood, city, and region. By re-evaluating and investing in our existing neighborhoods, they may become denser, more diverse, and more active while maintaining a smaller footprint on the earth.
An adaptable townhome unit that is a replicable prototype of efficient residential construction for Roxbury. The building consists of four typical three-bedroom units, approximately (1970 SF) each, in a row house configuration.
The building’s form and orientation serve to maximize natural daylight and solar gain for the photo-voltaic arrays generating, over the course of the year, more electricity than is needed on site. The approach includes two major strategies for energy reduction: first, a super insulated envelope minimizes heat transfer without relying on mechanical conditioning techniques; second, feedback mechanisms that provide information and prompt to users in the house regarding their energy-related activities. The project is thus efficient in energy, resources, use, and space throughout.
- Passive Solar
The southern façade is glazed to take advantage of solar heat gain in the winter. Deep overhangs and window depths reduce heat gain in the summer months.
Daylighting is maximized to reduce reliance on artificial lighting.
- Super-Insulated and Airtight Building Envelope
Ceiling/Roof: 14’’ TJI with dense-packed cellulose + R-15 rigid above (R-62)
Wall construction: 12” double 2×4 dense-packed cellulose with Zip system sheathing and Siga taping (R-40)
Windows: Schuco Brand, Low-E, triple paned uPVC windows are utilized. U-value 0.139
Floor Over Basement: 14’’ TJI with dense-packed cellulose + R-15 rigid below (R-62)
- Passive Ventilation
Air flow is allowed to move from the lower floors of the home to the top floor. Upper level windows and a clerestory condition allow for venting excess heat and help to provide more consistent interior temperatures.
- Site Water Management:
Rainwater harvesting done through rain barrels at downspouts and the collected water is used to supplement on-site landscape irrigation.
Rain gardens with drought-resistant native plantings are incorporated.
Turf is minimized and a Drought Tolerant Fescue ground cover is selected to reduce required irrigation.
- Mini-Split Units (Energy Star)
o Mitsubishi H2i Hyperheat MSZ FE09NA/MUZ-FE09NA, 26 SEER, 10 HSPF
o Mitsubishi MSZ-GE09NA/MUZ-GE09NA, 21 SEER, 10 HSPF
- Zehnder ComfoAir 350 Heat Recovery Ventilator at (Effective Heat Recovery over 75%).
- Blower Door Test: Infiltration was test at be 0.57 ACH (air change per hour) at 50 Pascals pressure difference.
- Rheem SolPak RS80-40BP, 40 square foot solar thermal panel (2.4 Solar Energy Factor) with an 80 gallon storage tank for hot water requirement.
- Efficient shower heads (1.5 gpm), faucets (1.5 gpm) and fixtures are used throughout.
- 235 W Panasonic HIT PV panels (Model VBHN235SE01) with an module efficiency of 18.6% (Installed at 4:12 slope)
- Enphase Micro Inverters (95.5% Efficiency Rate) Model: M210-84-208-Sxx
- CFL Recessed Lighting and Fixtures
Bosch 300 Series Appliances
Electric Cooktop and Oven
Refrigerator – Energy Star
Dishwasher – Energy Star
Washer/Dryer not provided
Zoning Approval May 2012
Building Permit Approval September 2012
Closing/Construction Start September 2012
Construction Complete September 2013
Sales/Closing September 2013 (226 Highland)
October 2013 (230 Highland, 232 Highland)
November 2013 (228 Highland)
BUILDING PERFORMANCE AND LEED CHECKLIST
Click on each image for a detailed LEED checklist.
Driven by rising energy costs and a desire to adopt a more sustainable lifestyle, Ted, his wife Suleyken and their two kids were looking to upgrade to a contemporary, energy-efficient house in a transitioning neighborhood. Their online search for housing led them to Boston’s E+ green building program and after a site visit in April 2013, they were quick to place a bid on the house and move in by end of the year.
They have been living in the house for over six months now and their level of thermal comfort satisfaction is beyond what they had previously expected. They believe that the design of the house itself encourages them to live more sustainably. With the need to cool or heat the house drastically reduced because of the integrated design features of natural ventilation, daylighting, optimal thermal insulation and heat recovery system, they are continually saving on the energy costs and in the process reducing their carbon footprint!
Furthermore, the solar panels on the roof produce more electricity than the house consumes, making it an ideal case for an energy positive or E+ house. The excess electricity hence produced is fed back to the grid, the owners enjoy rebates making solar panels a financially viable and technically feasible option.
Comparable to a conventional house in operational maintenance and capital costs, this E+ house presents a sustainable model of development that is quick to grasp and easy to hold on to. Ted loves to experiment with the settings of the Embue thermostat and the solar panel Powerdash, even the window opening for natural ventilation to further optimize their energy usage. The more he learns, the more he makes the house save for him. It is not surprising that the E+ program is leading by example and encouraging similar growth in the neighborhood and throughout the city.
BEST PRACTICES AND LESSONS LEARNT
- Make key decisions early in the design process to lessen design revisions and construction change orders
- Have an Integrated Project Team with both broad skillsets and specific/specialized skillsets to provide a holistic approach to design and construction
- Identify big cost items and evaluate the Cost-Benefit Analysis for the short time initial cost vs. lifetime cost
- Educational and informational sessions for local residents, industry professionals, contractors/suppliers to promote green/sustainable design and construction
- A site conscious building massing design and good solar orientation is crucial to maximize on Solar PV production
- Balance the cost implication and energy goals to produce a feasible project
- Select subcontractors and suppliers with working knowledge of Green/Sustainable practices and with an absolute desire to learn and innovate