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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.

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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.

 

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

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.

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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

ZED WINS GOLD AND SILVER IN 2021 PRISM AWARDS

ZeroEnergy Design took home two medals at the 2021 PRISM Awards, held annually to celebrate the best of the best in the local residential building industry. A record 331 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.

ZED’s Hingham Marshfront home won a Gold PRISM Award for Best Single Family Home: 3,000 to 4,500 SF. This green home was designed for a Hingham-based couple who commuted to Boston for work and desired a modern residence on their marshfront property that fit with their green lifestyle. Outdoor connections include a gracious 1,000 SF deck with al fresco living areas overlooking the vegetated salt marsh, a vegetable garden and an outdoor shower. Green features include a super insulated enclosure, triple-glazed windows, efficient cold climate heat pumps for heating and cooling, plus a rooftop solar electric system to offset energy consumption. These features not only reflect the owners’ efforts to be ecologically responsible, but also their desire for year-round resilience, protection from the elements, and optimal thermal comfort.

ZED’s Mt. Hope Modern home won a Silver PRISM Award for Best High Performance/Energy Efficient Home. This seaside Portsmouth, Rhode Island home home features warm stylish interiors, incorporates coastal resilience, and achieves near net zero performance, all while capturing commanding ocean views. While the design of the home gives it the appearance of being light on its feet, it is truly heavy on both energy performance and durability. The all-electric, super-insulated home’s consumption is offset with clean energy production from a 20kW solar electric system - and in terms of performance, the home has an amazing 2.8kBtu/sf/yr actual EUI, which is effectively 95% better than a typical code build house in New England.

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.

MORE: Awards Presentation

 

In Progress: Acton Passive House

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New Home Targeting Passive House Certification. This newly constructed home nestled in the Acton woods is an exercise in restraint, simplicity and form, all working together to create a stylish, environmentally sensitive residence. The home is Passive House (PHIUS) pre-certified and is on its way to receiving full Passive House certification. As construction nears completion, we take a look at the blend of features that were carefully balanced to create a tranquil indoor environment with an efficient footprint. 

Designed for Respite from the City. ZED was engaged to design this custom home as a primary residence for the client, who desired quiet and respite from urban life. The client envisioned a combined living/kitchen/dining room as the home’s nexus, which we designed with a wall of continuous glass that wraps the southeast corner of the house, connecting the interior to the natural surroundings. The rest of the home’s 1,650 SF rectangular footprint is composed of two bedrooms, two bathrooms, an office and mechanical/laundry room, all of which follow a simple, modern aesthetic – polished concrete floors, minimalist fixtures, and glazed so as not to have to turn on a single light during the day.

Constructed for Small Operational Impact. Adhering to the Passive House standard means that this Acton home will have incredibly low operational energy. A floating raft of insulation beneath the concrete foundation, known as a mono form EZ slab, creates a thermal break as well as a form for the concrete slab. To complete the airtight foundation, Stego Wrap was installed as a vapor barrier before the concrete was poured. Construction wasn’t easy, interrupted more than once by major snowstorms and high winds, but contractor Adams + Beasley was up to the task, weathering the challenging elements without compromising on the super insulated envelope or energy features.

This Acton residence is a Pre-Certified Passive House (PHIUS+) and will target Passive House Certification once completed

This Acton residence is a Pre-Certified Passive House (PHIUS+) and will target Passive House Certification once completed

Vastly Reduced Embodied Energy. For the home’s walls, wood fiber continuous exterior insulation, combined with dense pack cellulose in the wall cavities, was used - not only is wood fiber 100% compostable at the end of its life, but also exceptional for acoustic insulation and fire safety. Air tightness was achieved through a continuous exterior air/water barrier. An 18-inch truss of dense pack cellulose was used to insulate the top-vented shed roof, minimizing the use of foam. Since there is no basement, there was far less concrete used to construct the foundation, meaning less embodied energy. The home also faces due south, so there will be exceptional solar access for the photovoltaic panels, which will produce enough electricity to arrive at net zero or net positive energy.

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Check out More Construction Imagery and Time Lapse Video from Adams + Beasley’s Portfolio Page.

Hempcrete Comes to Cape Cod

Get a first look at this ZED consulting project (energy + HVAC design) in Harwich Port, MA where a hempcrete house is being built, one of the first of its kind in the country. ZeroEnergy Design provided the energy consulting and mechanical design for this forward-looking, carbon sequestering home. 

What is Hempcrete?
Hempcrete is a cutting edge biocomposite building material made from the chopped stalk of the hemp plant, a lime-based binder, and water. The result is a healthy, resilient and carbon beneficial building material that can be used to create a building’s thermal envelope, and which looks a bit like concrete. But unlike concrete, hempcrete actually sequesters carbon dioxide; a recent study showed that hempcrete can sequester 19 pounds of C02 per cubic foot. This progressive material is incredibly useful for: 1) reducing a building’s operational energy requirements with a well insulated, thermally broken, airtight enclosure, 2) sequestering carbon in the material itself, and 3) providing healthy indoor air via thermal mass and moisture absorbing behavior. 

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Material Attributes
Lime in the application of hempcrete uses about 80% less energy to calcine than when used in concrete. As an ‘air set’ material, the lime in hempcrete reabsorbs the CO2 that is driven off in calcining.

Hempcrete is resistant to mold growth, deters pests and won’t burn. The vapor permeable property of hempcrete also helps regulate building humidity, while its matrix structure provides excellent sound absorption.  

In addition to being a non-toxic and biodegradable material, hempcrete can be used to reduce construction waste by replacing drywall, which represents about 10% of building construction debris. Furthermore, hemp is a rapidly renewable resource with the greatest CO2-storing potential of any other insulation building material.

The Cape Cod Hemp House
The Cape Cod Hemp House exemplifies future focused, healthy, low carbon, net positive energy design. As this progressive home takes shape, we take a closer look at the carbon sequestering envelope, all-electric systems, and renewable energy sources that contribute to its net-zero energy makeup.

Envelope
The home's super-insulated envelope begins with 12 inch-thick walls with continuous hempcrete on the exterior and spray applied to a wood frame with bamboo wall lathe. The interior will be finished with a plaster coat. The roof includes hempcrete, wood sheathing, building wrap, and metal roofing. Triple pane windows round out the super insulated, airtight building enclosure.

Workers prep and spray hempcrete insulation between the 12 inch-thick exterior walls.

Workers prep and spray hempcrete insulation between the 12 inch-thick exterior walls.

Systems
High efficiency systems in the home include air source heat pumps, a heat pump hot water heater, and energy recovery ventilation. Rightsized air source heat pumps provide heating and cooling matched with the thermally improved building enclosure. Balanced heat and energy mechanical ventilation systems provide constant fresh air while also managing humidity levels. A heat pump hot water heater efficiently provides domestic hot water. 

Renewables
The all-electric home’s consumption is offset with clean energy production on the roof from a 15kW solar electric system with a whole-house backup battery. The photovoltaic array is expected to offset 120% of the total annual energy consumption, resulting in a net positive energy house. 

A Future for Hempcrete
While builders continue to see value in hempcrete, one of the limitations to its wider use is availability. Facilities capable of processing hemp into hempcrete are mostly in Europe and some regulatory challenges still exist in growing hemp itself, particularly in the U.S. But once more forward-thinking producers and builders start utilizing hemp for construction, it could lead to many more eco-friendly, high performance buildings.

MORE:  CAPE COD HEMP HOUSE

The interior side of the exterior envelope includes bamboo lathe with hempcrete inside the cavity.

The interior side of the exterior envelope includes bamboo lathe with hempcrete inside the cavity.

High-production European spray-applied hempcrete system. When completed, this project will be the first in North America to employ this system.

High-production European spray-applied hempcrete system. When completed, this project will be the first in North America to employ this system.

Brookline Masked Modern Home profiled in Modern Luxury Interiors Boston

Modern Luxury Interiors Boston profiled ZED’s Brookline Masked Modern residence, resulting in a detailed look inside this historic, green renovation project. The piece, titled ‘Framing History,’ touches on the design challenge of creating a modern home within an existing historic shell, and features many of the brands utilized throughout the home’s contemporary interior.

One of ZED’s goals for the project was to balance the historic front elevation of the home with the modern aesthetic of the interior and rear. This interplay is immediately apparent upon entering the home ground level, which features clean and elevated details throughout. Custom casework by Henrybuilt spruces up the entry area, Tom Dixon pendants add flair to the dining room, and distinctive Cle tile adds vibrancy to the kitchen backsplash. For the rear of the home, a gorgeous terraced landscape cascades down to a lower lawn, featuring outdoor dining areas and a swimming pool in between. Designing these functional outdoor spaces on such a steep slope was a particular challenge, notes ZED Senior Project Manager John Mucciarone, managed successfully through collaborating with Soren Deniord Design Studio.

The client, a family of five who had left their downtown Boston loft for a more generous home, desired plenty of recreational space inside as well. A home gym, an acoustically buffered entertainment center, and a play loft accessible via a climbing wall, are all examples of the family’s playful and active lifestyle.

The Brookline Masked Modern project completely renovated the building enclosure, adding super-insulation and triple pane windows to maximize thermal comfort with a minimal carbon footprint. ZED Managing Director Stephanie Horowitz adds, “When paired with all-electric, right-sized mechanical systems, the result is exceptionally low energy consumption - steps ahead of Brookline’s proposed ban on fossil fuels.” The result is a modern, low carbon home that masks modern with traditional, all while adhering to Brookline’s historic requirements.

Check out the profile here: Modern Luxury Interiors Boston

ZED Awarded Best of Houzz 2021 for Design

ZED has won a Best of Houzz award for Design on Houzz, the leading online platform for home remodeling and design.

ZED is honored to receive this award for the ninth time. Only a small percentage of the 2.5 million home professionals on the platform receive a Best of Houzz award, a thrilling validation of ZED’s continued hard work providing the highest level of design service in the industry.

The Best of Houzz badge is awarded annually, in three categories: Design, Customer Service and Photography. Design awards honor professionals whose work was the most popular among the 40 million plus Houzz community.

“The Best of Houzz awards are an emblem of trust and credibility for home professionals across the U.S. and around the world, and we are excited to celebrate this year’s winners,” said Liza Hausman, vice president of Industry Marketing for Houzz. “The COVID-19 pandemic has highlighted the critical need for people to feel comfortable before inviting pros into and around their homes, and the Best Of Houzz badge is a powerful way for pros to communicate the trust that homeowners have in their business. It’s just one of many tools on the Houzz platform that help pros to communicate their unique expertise, and homeowners to find the right professionals for their projects.”

The 2021 Best of Houzz award is ZED’s ninth year winning the Best of Houzz Design award and thirteenth Best of Houzz award overall.

MORE: AWARDS