ZED Out in the Community for Earth Day

ZED was out and about in the community for Earth Day, taking on projects in Boston and Somerville!

(Above) Fernanda Castillo kicked off a project at a brand-new community garden site in Boston (a partnership between Olin College PlnT (Olin College of Engineering Public Interest Technology) and the BFFC (Boston Food Forest Coalition). She designed a stage to be built (above right) for the community garden where residents can gather and host events, adding a backdrop for a local muralist to eventually decorate.

(Above) Alex Rabe helped protect and appreciate a beautiful River Birch tree on South Street in Somerville that was in need of some major TLC, cleaning up the tree well and building a fence out of used pallets to protect it from being the target of construction refuse.

Two ZED Affordable Housing Projects in Cambridge Earn Enterprise Green Communities Certification

Porter Road Apartments

Columbia Street Apartments

Two of ZED’s multifamily affordable housing projects in Cambridge, MA - Porter Road Apartments and Columbia Street Apartments - recently gained Enterprise Green Communities certification! This certification program aims to promote the creation of sustainable, healthy, and environmentally responsible affordable housing.

The Enterprise Green Communities Certification is a comprehensive green building framework designed specifically for affordable housing developments in the United States. Gaining certification can be challenging, as it requires comprehensive adherence to a set of rigorous standards that cover various aspects of building design, construction and operation. Here are some key aspects of the certification:

  1. Holistic Approach: The certification addresses various aspects of building and community design, including energy efficiency, water conservation, indoor air quality, and the use of eco-friendly materials.

  2. Criteria for Certification: Projects seeking certification must meet specific criteria that cover integrative design, location and neighborhood fabric, site improvements, water conservation, energy efficiency, materials beneficial to the environment, healthy living environment, and operations, maintenance, and resident engagement.

  3. Benefit for Residents: The primary goal is to improve the health and well-being of low-income residents while reducing environmental impacts and operating costs.

  4. Application and Process: Developers of affordable housing projects must adhere to the certification standards from the planning stages through construction and operation to achieve certification. The process involves planning, implementing, documenting, and reviewing strategies that meet the certification criteria.

  5. Support and Resources: Enterprise provides various resources, including guidelines, case studies, and tools, to assist developers in understanding and meeting the certification requirements.

This certification plays a crucial role in promoting sustainability in the sector of affordable housing, ensuring that these benefits reach communities that often have fewer resources to invest in sustainable development.

To learn more, check out the Enterprise website.

The Home Office: Reversing the Angle

The evolution of the workplace, particularly with the rise of remote work, has brought about a renewed focus on the aesthetics of our work environments, extending beyond the physical office to include the digital realm. Having a beautiful office is no longer just about creating a pleasing physical space for productivity and creativity; it's equally important to consider the visual backdrop that represents us in virtual meetings. This dual focus ensures that our professionalism and attention to detail are evident, not just in our work, but also in the environments we choose to display during video calls.

Creating a net zero sustainable home was the first priority for our client in Somerville, MA - a gorgeous office and zoom backdrop was just the cherry on top. The ascending staircase of bookshelves, paired with the cascade of ornate pendant lights and lush greenery conveys a strong sense of the owner’s identity. Moreover, the window-laden office itself contributes to a positive work-from-home experience overall, boosting mood, creativity and productivity. In a time when the boundaries between home and work are increasingly blurred, a dedicated and aesthetically pleasing workspace can help create a sense of routine and normalcy. It can also serve as a form of personal expression, allowing individuals to showcase their style and preferences in a way that enhances their work identity.

New Case Study: Belmont Modern Home

A Modern Mid-Century Home in Belmont

This modern high performance home in Belmont was built in two phases, beginning with an addition to an existing 1960s-era house. The home’s two bifurcated wings informed the decision to phase the project so that the owners could live in part of the home with their three children during construction. The design kept a similar footprint and created two distinct wings with a connector in between. This central corridor is the home’s formal entry point and provides a dramatic perspective overlooking the abutting Mass Audubon sanctuary beyond.

Inside or out, this home blends and flows into its surroundings, outfitted with large glass doors, generous windows and oversized sliders at several key connection points. The triple glazed Schucco windows and doors allow wonderful views regardless of the season. ZeroEnergy Design (ZED) carefully framed views of the outdoors from each space of the home, taking advantage of the scenic conservation areas and gardens surrounding it.

In keeping with the Passive House principles, the home is incredibly energy efficient with a Predicted Energy Use Intensity (pEUI) of 3.5kBtu/sf/yr. The super insulated envelope has a concrete slab has 4” of EPS below with an R-value of 17. The above grade walls are R-44 and the roof is R-66. The home’s air tightness exceeds .05cfm/ft2, which measures the air leakage in relation to the surface area of the building envelope. For context a typical new construction is about 3 ACH50 or less. This home tested about six times tighter than that - at 0.37 ACH50.

To optimize thermal comfort, state-of-the-art Zehnder ERVs supply all the living spaces with filtered fresh air year round. This feature enables recovery of 90% of the energy from the conditioned air as the stale interior air is exhausted out. The ERV, combined with the exterior insulation on the walls and roof, significantly reduces the energy needed to heat and cool the home.

All of the home’s appliances are electric. Mitsubishi heat pumps supply the heating and cooling; electric induction cooktop and laundry facilities take care of the cooking and cleaning and electric heat pump water heaters take care of the rest. 42 Roof-top mounted solar panels keep the electricity running and supply a powerwall for emergency back-up.

ZEN Associates worked with the architects and clients to seamlessly integrate the indoor and outdoor spaces with expansive views and oversized sliding doors. We worked to protect existing mature plantings around the home and the new plantings enhance the modern aesthetic of the home.  The use of native plants and thoughtful design brings the outdoors-in creating an organic feel to the new spaces. An interesting story from the build is that during excavation, an underground stream was discovered at the foundation level. We were able to divert it around the house and guide the natural water flow out over boulders from the excavated areas to the wetland in the backyard.

PROJECT TEAM

ZeroEnergy Design
Architecture & Mechanical Design

Auburndale Builders
Contractor

ZEN Associates
Landscape Architecture and Construction

MORE: Case Study

Montage
Furnishings

Nat Rea Photography
Photographer

NESEA Pro Tour at Multifamily Gut Rehab in Cambridge

On Friday May 19th, ZED joined Northeast Sustainable Energy Association (NESEA) in leading a BuildingEnergy ProTour of a 3-unit triple decker in Cambridge that underwent a gut rehab after a fire in 2020. The project was developed by Homeowners Rehab Inc (HRI) and now provides three apartments for low-income residents.

Erika DeRoche of ZED kicked off the tour with a 45-minute overview of the project, which was then followed by a three-stage tour of the basement, exterior, and interior of one unit. Erika DeRoche from ZED, Deliandro Cruz of Alpha Smart Builders and Nate Wickman of New Ecology, Inc. hosted each station, talking about the finer points of this ambitious energy efficient renovation. Attendees were able to hear about design decisions around HVAC, Domestic Hot Water and Fire Protection systems, as well as the wall and flooring assemblies, all of which prioritized resident comfort and sustainability.

We are incredibly proud of this project and the work of all of our partners and collaborators that made it come together so successfully. Our hope is that this type of retrofit - all-electric, no combustion on site, high efficiency systems and super-insulated envelope - will serve as an example of not only what is possible for this building typology, but also what should become the norm for future projects.

Learn more about this project: Columbia Street Residences

More images from the tour here.

Acton Passive House Featured on NBC Boston

Owner Philippe Lam talks to the NBC Boston crew about his new net zero home.

ZED’s Acton Passive House was featured on NBC Boston, providing an inside look at the benefits of a net zero, Passive House Certified home. The piece includes interviews with ZED’s Stephanie Horowitz, Contractor Adams & Beasley’s Dave Wittig, and Owner Philippe Lam.

Take a look at the video that gives an overview of the home’s many high performance features, such as rooftop solar panels that produce more energy than it uses over the course of a year, making it net positive energy. The environmental benefits to the owner include remarkable thermal comfort, excellent indoor air quality, low operational cost, a durable, long-lasting structure, low embodied carbon materials, and most importantly, a happy client enjoying his beautiful new home.

LINK TO STORY

12 Pros Share their Favorite Sustainable Design Features ON HOUZZ

Houzz spoke with 12 pros about which sustainable features homeowners should consider to cut energy use and reduce their carbon footprint. Architects, builders, interior designers and landscape designers were interviewed and also discussed the sustainability solutions they’re most excited about.

ZED’s Jordan Goldman, provided the following thoughts:

Sustainable features ZED uses. “Our main focus for sustainability is reducing the carbon footprint of our buildings. [That applies to] both operational carbon — due to the energy demand — and the embodied carbon — due to the materials involved in the project’s construction,” Jordan Goldman says.

“To reduce operational carbon, we emphasize an exceptionally well-insulated envelope, efficient systems and renewable energy.” Goldman says. “To reduce embodied carbon, we try to avoid or minimize the use of materials like concrete, steel and foam, since they typically have an outsized contribution to the overall embodied carbon. To reduce both operational and embodied carbon, we avoid designing oversized houses and buildings.”

Sustainable solutions Jordan’s excited about. “Over the last couple of years, we’ve shifted from using rigid foam [insulation] to products like wood fiberboard — made from compressed sawdust, diverting the material from the waste stream — and rigid cork — made from harvesting cork trees in a process that doesn’t harm the rest of the tree. Both products are considered to be carbon storers — that is, negative embodied carbon — so they’re much more environmentally friendly than rigid foam, which has significant embodied carbon,” Goldman says.

FULL ARTICLE

Inside an Air Barrier Inspection

Location: Inman Square, Cambridge, Massachusetts

Services: PHIUS+ Energy Consulting and Mechanical Design for a New Modern Single Family Home

ZED recently visited a site in Cambridge to check out the progress of the home’s air barrier. ZED’s Jordan Goldman, who provided energy consulting and mechanical design for the three-story, single family house, led the site visit along with representatives from ZRE Development (Owner) and GRS Construction (Framer). Site visits like this during construction are important both for catching any errors before the building enclosure is complete and for educating builders about proper technique going forward in the process.

Jordan walked the interior and exterior of the home, paying particular attention to the many tricky areas where air leakage typically occurs. A home’s air barrier is intended to limit uncontrolled air leakage into and out of a building’s thermal envelope. ZED’s design is for the air barrier to be continuous, which means that the system has no discontinuities, particularly as it transitions from one assembly to another (e.g. from wall to roof). ZED typically installs the air barrier at the sheathing layer, where it’s easy to maintain continuity across the envelope. Exterior rigid insulation will protect the air barrier from the outside and the framed wall cavity protects the air barrier from meddling hands on the inside.

Example of an air barrier:

Thermal Envelope:
The basement slab, foundation walls, above-grade walls, ceilings, roofs and any other building element assemblies that enclose conditioned space or provide a boundary between conditioned space and outdoors or uninsulated spaces.

Click to Expand this typical wall section, components of which exist at this project.

The largest component of this Cambridge home’s air barrier is the green ZIP System sheathing that wraps the whole exterior of the house, but there are other components that we will explore below:

Exterior: Green ZIP sheathing with integral air barrier. All seams of the ZIP must be taped, as well as any nails that have been overdriven (such that the nail head pulls through the green face of the ZIP) - with tape or liquid flashing.

Exterior: The roof edge detail has 4” of continuous insulation wrapping over the roof edge with the fascia board fastened to the structure underneath. A self-adhered membrane will be installed over the roof sheathing, turning down over the wall to tie into the ZIP sheathing.

Exterior: All exterior wall penetrations have to be water tight and air sealed. Water-tightness occurs at the outer surface of the foil-faced polyiso; air-tightness occurs at the ZIP sheathing. ZED recommends installing conduit / wires / pipes / ducts that will penetrate the building envelope now so that they can be easily air-sealed to the ZIP sheathing.

Interior: The slab vapor barrier turns up at the perimeter and is taped to the foundation wall. The foundation received a primer for proper tape adhesion.

Bonus: Jordan surfing the window well!

Exterior: Semi-rigid mineral wool insulation at foundation wall. Foil-faced polyiso foam board insulation should meet the kickout flashing from above and meet the mineral wool from below. Cut edges of polyiso should all be wrapped in tape.

Exterior: Windows are aluminum clad triple glazed windows, fully air-sealed at the exterior window face. ZED recommends a different sill prep for doors than windows, since water infiltration is more of a liability at the door sill. Lift/slide doors (see left) will lead to a freestanding deck.

Interior: Rim joists need insulation. Mineral wool batt is recommended for ease of installation.

Bonus: PV panels spotted on the neighbor’s roof!

In Progress: Cork Insulation at this Providence Net Positive Home

A new net positive, all-electric home is being constructed in Providence's East side, utilizing cork insulation as a component of its airtight enclosure. Cork insulation will help keep the home cool during summer and retain heat during winter, reducing energy consumption and contributing to exceptional indoor air quality.

About Cork Insulation. Cork is a 100% natural and renewable material, made by carefully harvesting the bark of a cork oak tree, an ancient tradition that doesn’t damage the tree. These trees can live between 150 and 250 years and are harvested every nine years - moreover cork tree harvesting actually improves the tree’s health over its lifespan!

Cork is then dried and expanded into cork board through a steam-heat process, requiring no added chemicals or binders during its production. In fact, all byproduct and waste is returned to the production process, making cork insulation incredibly sustainable. The result is a finished product with a negative carbon footprint.

Project Background. This project was conceived as a full time residence for an author who desired open concept living, outdoor connections, and enough bedrooms to accommodate her mature children with their own future families. A music room and craft studio allow the homeowner to explore her artistic pursuits, while an electric cooktop and built-in car charging station make carbon free living accessible.

Location. The residence is located in the Blackstone neighborhood, in the northeast corner of Providence's East Side. The land parcel consists of 18,700 SF of mature grounds and trees, privacy from the road, and a south facing backyard. Several of the client's relatives moved into the neighborhood, creating a sort of urban family compound. Large areas for gathering were therefore a priority, as were open-concept spaces for cooking, dining and entertaining.

FEATURES:

  • Indoor and outdoor living spaces

  • Expansive glazing for views, daylight, and energy

  • Intentional continuous spatial flow, modern sight lines

  • Seamless indoor and outdoor living

  • Exercise room and cedar soaking tub

  • Craft studio, music room

  • Two car garage with electric charging

  • Tesla battery backup

  • Private primary suite deck

  • Shou Sugi Ban ell detail

TEAM

Architecture, Mechanical Design: ZeroEnergy Design

Contractor:
Adams + Beasley Associates

Interior Design:
Atsu Gunther Design

Landscape Architect:
Greg Lombardi Design

Windows and Cork Supplier:
Eco Windows and Facades

Photos:
Adams + Beasley Associates

Pre-Cork:

Acton Passive House Awarded at Phius Passive House Design Competition

ZED’s Acton Passive House was a winner in the Source Zero Category of the 2022 Phius Passive Projects Design Competition. To even be considered, projects had to be Passive House Certified by Phius, and competed against the best of the best in passive design. In addition to being PHIUS+ 2018 Certified, the Acton Passive House also attained Source Zero certification, an additional designation indicating that the home produces any remainder of energy demand with on-site renewable energy.

The Source Zero category was one of 8 medals awarded at ‘PhiusCon’ 2022, held in Chicago’s historic Palmer House Hotel. This recognition is testament to the Acton Passive House’s incredible performance. With rooftop solar panels, the home is projected to produce more energy than it uses over the course of a year, making it net positive energy as reflected in the negative pEUI (-3.81kBtu/sf/yr).

The 8th Annual Phius Passive Projects Design Competition Awards Ceremony recognized a winner and honorable mention in each category, with submissions from throughout the United States and Canada. Categories were: Single-Family, High-Rise Multifamily, Low-Rise Multifamily, Commercial/Institutional, Retrofit, Source Zero, Best Project by a Young Professional, and Best Overall Project. All awardees pushed the boundaries of passive building design.

MORE: ARCHINECT NEWS PUBLISHES WINNERS

MORE: PHIUS PROJECT DATA

List of Winners:

Phius Project Data:

ZED WINS SILVER IN 2022 PRISM AWARDS

ZeroEnergy Design’s Acton Passive House was awarded a Silver medal for Best High Performance/Energy Efficient Home at the 2022 PRISM Awards, held annually to celebrate the best of the best in the local residential building industry. A record 370 PRISM entries were received this year with 12 judges from across the country choosing Gold and Silver crystal award winners who were announced at the gala.

Acton Passive House. This custom home was designed as a primary residence for a client who desired high performance as well as a respite from urban life. His vision was a home nestled in the woods and right-sized for his lifestyle, nothing more, nothing less. The result is a sleek house with a simple shed roof, designed to the PHIUS+ 2018 performance standard, which offers energy efficiency and exceptional comfort. In order to help ensure low operational cost, the roof is outfitted with a solar (PV) array and has also achieved Source Zero Certification.

The Builders and Remodelers Association of Greater Boston (BRAGB) is one of the leading trade associations in New England since its inception in 1944. The PRISM Awards Gala is the BRAGB’s flagship event of the year and winning an award is considered a sign of excellence and superior achievement. Each entry submitted in the PRISM awards competition is judged on its own merit by a national panel of distinguished industry professionals.

 

Backstage at a Blower Door Test

Building diagnostics and commissioning is standard procedure at ZED, which includes blower door testing at key stages in the construction process. Blower door testing is a crucial aspect of putting together the building envelope correctly, helping ensure an airtight home. An airtight air barrier not only prevents cold or warm air from getting in, but also moisture, dust, pollen and other contaminants to entering the home.

What does a typical air barrier look like?

We perform blower door tests at multiple points during construction to ensure success. At our Columbia Street Residences project in Cambridge we had to do this initial test without a completed air barrier in the basement but were in range of our target. New Ecology performed the test and found approximate air leakage to be 2.6 ACH50.

How a Blower Test Works
The blower door test is used to quantify the amount of air leakage through a building’s enclosure. A blower door fan is temporarily sealed into an exterior door or window, while all other exterior openings are closed, as well as all mechanical exhaust devices shut off. When the blower door fan is turned on, it creates either a positive or negative pressure differential between inside and outside. This in turn forces air through any penetrations in the building enclosure it can find, which is what the blower door test measures. This air leakage results measurement called ‘air changes per hour,’ or ACH50.

Air Leakage (ACH50)
Air changes per hour (ACH) is calculated using a blower door at a standard pressure difference of 50 pascals (a unit of pressure) between inside the home and outside. A building's ACH50 therefore tells us that at the pressure of 50 pascals, air leaks from the building at a rate of X times the volume of the building per hour. For example, a leaky building might be 15 ACH50, while a high performance building is typically 1 ACH50 or less. The Passive House standard requires 0.6 ACH50 or less.

Architecture: ZeroEnergy Design
Mechanical Design: Ripcord Engineering
General Contractor: Alpha Smart Builders

ZED's Stephanie Horowitz Brings Net-Zero Expertise to a Somerville Victorian

Energy Retrofits in Historic Homes. Stephanie Horowitz was enlisted by Boston Globe staff to tour a historic Somerville home and share her thoughts about how to improve its energy efficiency towards net-zero performance. Stephanie joined air-sealing specialist Jason Taylor of Byggmeister Associates and contractor Mark Philben of Charlie Allen Renovations on the tour. The group provided recommendations on the attic and basement insulation, use of a blower door test for checking air leaks, proper interior and exterior wall insulation, custom-built storm windows, and more. The piece provides convenient cost information for each topic, giving the reader a sense of what a retrofit to an old home might set them back. The question remains - if net-zero is your goal, is retrofitting an old home the most reasonable path?

MORE: BOSTON SUNDAY GLOBE STORY

In Progress: Multifamily Housing in Taunton

ZED has been working with the Taunton Housing Authority (THA) since 2020 to perform a comprehensive sustainable renovation of four scattered site low-rise developments with 24 units of multifamily affordable housing. Funded by DHCD Formula Funding and a Comprehensive Sustainability Initiative (CSI) grant, the goal was maximum energy conservation, emission reductions, and water use reduction. The result was significantly upgraded apartments with superior insulation, triple-glazed energy efficient windows, insulated doors, and optimized systems to improve the quality of life for THA’s residents.

Energy and Cost Reduction. Testing, site visits, analysis and cost estimating resulted in cost optimal improvements, including air sealing, extra attic insulation, new doors, continuous insulation, foundation insulation, high efficiency boilers, and toilet replacements. Air sealing and insulation was achieved by the installation of a Zip System R-Sheathing for 4 inches of total continuous insulation, taped air/water-resistive barrier, re-siding, and air sealing at vented attics. At the Martel Street development, the fieldstone foundation wall and rimboard was air sealed and insulated using low GWP closed cell spray insulation. This resulted in a 70.5% air tightness improvement between pre- and post-construction blower door testing.

Overcoming Challenges. Each of the four sites had unique conditions, however all shared the challenge of increased costs and elongated procurement due to COVID-19. Additionally, there was existing poor quality construction at two of the four developments, no access to crawl spaces under one development, and fully occupied residences during all renovations. At one development, Owner records showed that construction was completed in 1983, however closer observation indicated a far earlier vintage, such as balloon framing and heavy timber sill on fieldstone foundations. Re-siding and re-roofing were outside of the project scope, so ZED recommended 3” low VOC ccSPF insulation for the basement air sealing and insulation, allowing resident reentry within 6 hours; foam sealant plus blown cellulose insulation for the attic.

 

Zip system tape at flanged window creating positive drainage 

Zip-R insulated panel over 2” foil faced insulation and self-adhered air barrier

Foil faced insulation over continuous air barrier 

Cement board and stucco protection over foundation insulation board

Wall insulation inside porch roof

New low-maintenance, durable roofing and siding

Home Builder Digest Names ZED on Best Residential Architects Lists

ZeroEnergy Design is delighted to be named by Home Builder Digest on two ‘Best Residential Architects’ lists in East Norfolk County and Medford, Massachusetts. Each of the architects featured on these lists were chosen by the editorial team at Home Builder Digest based on experience, merit, and portfolio.

East Norfolk County includes some of the most beautiful houses in the south shore of Boston - from quintessential New England homes to beachfront properties with views of the Boston skyline. Medford, just to the north of Boston, is consistently rated one of the best places to live in Massachusetts, featuring a mix of urban and suburban homes within striking distance of the city.

The articles feature ZED’s Hingham Marshfront Home and the Lexington Modern Residence, both modern green homes with endless outdoor connections.

MORE: BEST OF EAST NORFOLK COUNTY | BEST OF MEDFORD

CUSTOM BUILDER MAGAZINE FEATURES HINGHAM MARSHFRONT

ZED’s custom home in Hingham, MA was featured in the Spring 2022 issue of Custom Builder Magazine, in an article titled ‘Net Zero and Beyond.’ The piece talks about what it takes to design a home to net zero - or net positive - energy performance - which isn’t achieved with just a few solar panels. Design, siting, and building enclosure are all part of the equation, in addition to “listening to clients and interpreting their program to look for ways to incorporate flexible spaces serving multiple purposes and/or transforming over time,” says Stephanie Horowitz, who was interviewed for the piece.

When talking about net zero homes, great design often gets lost in the conversation. Horowitz emphasizes this important first step, which is then followed by (2) super-insulated building enclosure, (3) high efficiency systems, and (4) renewable energy, prioritized in that order and all working together as a system.

Hingham Marshfront. The 4,200 square foot home takes advantage of its natural surroundings with multiple decks overlooking the salt marsh and a vegetable garden, all part of the owners desire to connect to the outdoors. Other features include a private guest studio, large mudroom and art space and open living areas that create maximum functionality for the owners and their soon-to-be young adult children.

MORE: CUSTOM BUILDER ARTICLE

Acton Passive House Achieves PHIUS+ Certification

ZED’s new home in Acton is now officially a PHIUS+ 2018 & Source Zero Certified Project! This 1,650 SF residence was constructed for small operational impact, vastly reduced embodied energy, and energy efficiency. In addition, rooftop solar panels will produce enough energy to arrive at net zero or net positive energy.

Passive Home certification requires very precise and tighter construction than what is used for typical built-to-code homes. The result is an exceptionally tranquil living space that is comfortable year-round, provides excellent air quality, and has extremely low energy use. ZED and contractor Adams & Beasley are incredibly proud of this achievement.

Source Zero is an additional recognition that advances community goals of carbon neutrality and climate resilience at the project level. Achieving PHIUS+ means dramatically reducing demand; achieving PHIUS+ Source Zero means meeting the small remainder with on-site renewable energy.

The Passive House Building Energy Standard is the most rigorous building energy standard in the world

Green Building Advisor Features ZED's Stephanie Horowitz on Zero Energy Homes

Green Building Advisor posed a simple question to ZED’s Stephanie Horowitz: “Is Zero Energy the Answer?” Horowitz joined a handful of experienced industry experts in submitting short essays on this topic, exploring the challenges, opportunities, and shortcomings of zero-energy homes. Many of the entries focus on rooftop photovoltaic (PV) systems, which generate electricity at home, heating systems and insulation, and the role homes play in the global picture of carbon emissions.

Article Link: Is Zero Energy the Answer? (subscription required)

Newton Net Zero, one of ZED’s super-insulated, net zero energy homes. EUI: 0.4kBtu/sf/yr | 0.19 ACH50

In Progress: Net Zero sanctuary in Westport

ZED is nearing completion of a new energy efficient residence in Westport, MA. The design, which features two gable-roofed structures set in an open meadow, was inspired by the agrarian aesthetic of the area, creating a zen-like sanctuary for the owners.  

The client, a soon to be retired couple from Wayland, chose to relocate to Westport to find more community and gain more consistent access to the outdoors. They also desired a home with minimal energy consumption, minimal maintenance, and exceptional durability, with net zero or better performance. 

Lofty Spaces and Outdoor Connections.  ZED created a home consisting of two formal gray masses with natural material connections - a primary residence and detached barn-like garage connected by a covered walkway. The three-bedroom main house is open concept and window-filled, the entire home meant to feel like one giant room. The spacious kitchen flows into the living/dining room, which benefits from double-height ceilings, ample windows and giant lift/slide glass doors. On the other side of those doors is a large awning and shading device that helps filter out light and heat, as well as a substantive deck for outdoor entertaining.

Rooms Designed for Openness and Flexibility. One enters the primary bedroom on the second floor through a wide cased opening, making it feel completely open and seamlessly connected to the rest of the house. The two ‘guest’ rooms were designed to be adaptable, either as home offices, guest bedrooms, or exercise rooms. Additionally, the first-floor bedroom can be easily transformed into the primary bedroom suite, should the owners desire moving downstairs as they age in place. The two-car garage brings plenty of versatility as well, providing room for vehicle and outdoor equipment storage, a workshop, or ’tinkering’ space, and multi-purpose loft. 

Net Zero Energy Performance. The electric home was designed to be in line with net-zero or net-positive energy performance, featuring a super insulated enclosure, triple-glazed windows, air source heat pumps, balanced mechanical ventilation with heat and energy recovery, plus a large 51-panel solar array to offset energy consumption. Embodied energy was reduced by using minimal foam, wood fiber continuous exterior insulation, loose-fill cellulose for the roof, and mineral wool interior insulation on basement walls; the garage is not heated, utilizing only mineral wool in the wall cavities. These performance features, combined with the minimalist design, result in an exceptionally peaceful environment for the owners.

A floating staircase with a gentle rise provides access to the second floor

Living/dining room features lots of light

Large lift/slide doors open to the outside

The primary bedroom is open to the rest of the house through a large cased opening

Detached garage with covered connection

Covered passageway to garage

The addition of the orange awning and shading device will help filter out summer light and heat

ZED Celebrates 10 Years of AIA 2030 Commitment

According to the newly released 2020 Summary of the AIA 2030 Commitment report, ZeroEnergy Design is one of only 15 firms to achieve 80% or greater predicted EUI savings across their entire architectural portfolio. In 2020, 378 companies reported, representing 3.8 billion square feet across 102 countries.

For the tenth year in a row, ZED tracked and reported its energy data against the AIA 2030 Commitment and 2030 Challenge, each year exceeding the minimum thresholds. 2020 marked a significant milestone for the challenge, increasing the carbon reduction target from 70% to 80%.

Measuring Progress: AIA 2030 Report Summary for 2020
Over the course of 2020, ZED reported an impressive 102% reduction in pEUI savings across its entire architectural portfolio, outperforming the target for the 10th consecutive year.

10 years badge.png

The AIA 2030 Commitment program supports the AIA 2030 challenge, which calls for all new construction and major renovations to be carbon neutral by the year 2030 and provides architects, engineers, and owners a global platform to demonstrate action against climate change through energy-efficient design.

In 2020, the 2030 Commitment participants reported energy savings equivalent to carbon emissions that would be sequestered by more than 42.3 million acres of forest, or 34.6 million tons of CO2 emissions, in one year. Click below for the full report.

MORE: AIA 2030 Commitment Report