Backcountry Skiing the Birthday Bowls

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Prepared for a day of backcountry skiingBy Luke Sisler

Clicking out of my skis on the notch road I replay the backcountry skiing run in my head. It was a bit after 4 p.m. and I had just finished work, hopped on the big quad at Spruce Peak, just before closing. It got me most of the way up to help drop me in the trees on the north side of Smugglers’ Notch. I now had to shoulder my skis and walk a few hundred vertical feet to the high point and get myself back to the house Sisler Builders is building at the base of Stowe Mountain Resort, where I parked my truck nine-and-a-half hours earlier.

Powder skiing in the backcountryIt was a good day. I watched the snow pile up, but I had things to get done. So, I put in eight hours of mechanicals, framing changes, light fixtures, and creating functional art. All the while planning my descent. They call the backcountry skiing area in Stowe the Birthday Bowls. All you do is go up the big quad at Spruce Peak and drop down the backside. It is a committing feeling walking out the gates and dropping away from civilization of a guaranteed lift to the top. So, most people don’t take the drop.

I enjoy it though. The walk up is therapeutic, the long runout is more time on skis. And in my opinion, more time on skis is good. This run down was exceptionally good. I had solid memories of a few quick face shots, a sweeping turn through pine trees, and hop down the short end of a cliff. The pow was soft, fluffy, and floaty. What more could I want?

measuring snowThere are some gnarly features in Vermont’s Smugglers’ Notch State Park. I aim to explore most of them, some other places in the greater Appalachians, too. Skiing in the backcountry, however, is serious business. I know Vermont has real mountains and Mansfield is one. In the past, people have died skiing the notch. I do not plan on being another of that statistic. My experience skiing in more documented avalanche terrain has taught me the way to avoid it is knowledge of terrain, respect for the mountain, realization of bigger things than yourself, and proper planning.

A few jubilant and committed pow turns into my descent it occurred to me that I am alone, and an injury here would be a real chore. My next few turns were a bit more reserved. I hit my groove and had a blast avoiding all the tracks I could. I love fresh snow and that particular winter was exceptional in that regard. This was the third of three storms that gave us three feet each. Quite the privilege!

No doubt my previous winter as a night janitor for Jackson Hole provided more time on skis, but pow skiing does happen in Stowe. It is here for us to go get. I’m happy to get it after a productive day at work or whenever I can.

Luke Sisler is a site supervisor for Sisler Builders, and an avid skier, hockey player, and mountain biker.

European Inspired Mountain Chalet

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European Inspired Mountain Chalet-summer exteriorWhile traveling in the French and Swiss Alps, the owners of this European inspired mountain chalet became captivated by the rustic charm of the over 200-year-old chalets they had seen there. They perused numerous books about chalet design, becoming both well informed and even more enthusiastic with the building style. Working with architect Paul Robert Rousselle of Stowe and Steve Sisler of Sisler Builders, they incorporated design cues from traditional chalet construction, their own carefully cultivated theme ideas, and state-of-the-art energy usage desires to bring their unique European inspired mountain chalet to fruition for the 21st century and beyond.

European Inspired Chalet-north side windowsThe couple and their three children, ages 13, 18, and 20, are originally from Long Island. They moved to Stowe for its quality of life, easy access to sports, and the outdoor activities they enjoy. They rented a home while beginning the process of designing their house, finding an architect, and deciding on a builder. After meeting with Steve and checking with a variety of reference sources they chose Sisler Builders. Steve had done similar chalet-style construction, and they felt that besides his reputation for perfection and integrity, he and his team were well suited for the job. They also knew that Sisler Builders is committed to building highly energy efficient homes, a priority for them.

European Inspired Chalet-living roomEuropean Inspired Chalet-dining room view

Beyond being committed to the chalet aesthetic, the couple’s primary objectives were an open and functional layout, natural flow, and ease of use. They wanted to maintain a timeless look, so the house never felt dated. They also wanted to take advantage of the fantastic sloping site, situating the house so that it made the most of the jaw-dropping views of Stowe’s ski trails. The floor-to-ceiling windows all across the main living areas did the trick for this last desire!

“There was a lot of collaboration during the building process,” said the husband. “Every square inch of the house was discussed with the architect and builder, weighing all factors of design, engineering, and the actual building process.”

Energy efficiency

The nearly 4,500-square-foot structure is extremely air tight and energy efficient. It is heated with geothermal wells connected to electric heat pumps, which are partially powered by photovoltaic (PV) solar panels. A wood stove, cleverly connected to duct work that is part of the air conditioning system, allows heat to be distributed throughout the home, instead of being concentrated to the area close to the woodstove. The structure tested out at 0.82 ACH50, which means it has a nearly Passive House air exchange level, and is remarkably air tight. It has radiant heat tubing embedded in the concrete slabs of both the lower and first floor levels. This is a well-thought-out system, as the heat pumps can readily produce water at just the proper temperature for optimal radiant heating. With the exceedingly low natural air-exchange rate, a mechanical heat recovery air exchange system was mandatory.

Sisler Builders optimized the amount of insulation installed by computer modeling the front-end cost of different thicknesses of insulation versus the operating cost associated with those thicknesses. With this proper engineering and holistic mechanical system approach, the owners have found that the wood stove heats the entire house, and are ecstatic about the inexpensive heating costs and comfort they feel year round.

European Inspired Chalet-dining room European Inspired Chalet-bedroom

Staying local

European Inspired Chalet-kitchenLocally sourced materials strongly influenced the house design. A significant contributor to its look and feel was the use of native hemlock beams and paneling that were procured and milled nearby. Sisler Builders took special care to purchase and sequence their installation in order to facilitate proper drying of the wood. The wife’s favorite aspect of the interior is the mix of rustic and modern design themes throughout the house, which were achieved with materials such as the native hemlock beams juxtaposed with refined tile and crisp sheetrock detailing, finished in striking colors.

The husband’s favorite aspect is the kitchen, which he says is the house’s focal point. “I like to cook. I wanted a kitchen that is functional. We put a lot of thought into multiple work stations and the layout works well for us. I like all the systems and finishes we integrated.”

European Inspired Chalet-winter exteriorThe owners would have preferred to take a year up front to flesh out the house’s design, but they did not have that luxury, so decisions were made almost daily during the building process. “The project manager, Matt Rouleau was brilliant,” the husband said. “He coordinated everything and it was a pleasure working with him. He is extraordinary. Our experience with Sisler Builders has been great. They stood behind everything they did and we continue to have good relationships with Steve and Matt and all the carpenters and subcontractors we met through the process. We’re very happy with our Vermont chalet.”

European Inspired Chalet-aerial

What is ACH50? All You Need to Know is Right Here

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The last five houses that Sisler Builders completed have all tested with ACH50 less than .85. But what does that mean? What is ACH50? Get ready for some physics!

What is ACH50?What is ACH50?

ACH50 is the abbreviation for air changes per hour at 50 pascals (Pa) pressure differential. It is how we measure the energy efficiency of a house. It is the number of times the air volume in a building changes per hour at 50 Pa of pressure. During a blower door test we depressurize a building to negative 50 Pa pressure, with regard to the outside air pressure. We accomplish this by continuously exhausting a measured volume of air from the building with the blower door, while simultaneously measuring the pressure differential from inside to out. We adjust the bower until we reach our target pressure differential of negative 50 Pa, and then record the volume of air being exhausted to accomplish this in cubic feet per minute (CFM). This measurement is called the CFM50 of the building and quantifies the air leakage of the structure being tested. The higher the CFM50, the leakier the building.

What is ACH50?CFM50 is the building performance standard used almost universally to quantify building air leakage, but it is not a very useful number for evaluating how “tight or leaky” a building is, unless we know a little more about the structure. For example, a giant warehouse may be quite tight, but have a high CFM50 compared to a small house that is quite leaky, because of the enormous discrepancy in the volumes of the two buildings. In order to compare the relative “leakiness” of separate buildings we need to account for this potential difference in structures’ volumes. To do this we use both the CFM50 and volume to calculate what is called the ACH50 – air changes per hour at 50 Pa pressure differential – of the structure. This number indicates the number of times in one hour the total volume of air in the entire building will be exhausted through the blower door when it is maintaining -50 Pa pressure differential with regard to the outside air pressure.

The CFM50 tells us how many cubic feet of air are being exhausted from a building every minute to reach -50 Pa. To calculate ACH50 values we multiply the CFM50 number by 60 minutes per hour to determine how many cubic feet per hour are being exhausted. Now we divide this product by the total volume of the building in cubic feet and we know how many times this volume will be exhausted in on hour at this pressure. Voila. The ACH50 values!

A building’s ACH50 number indicates how tightly a building was originally constructed (or later air-sealed) and is an excellent gauge for comparing leakiness between buildings. The lower the ACH50 values, the tighter the building. Vermont’s residential energy code currently requires new houses to have an ACH50 of 3.0 or less. By comparison, many older houses we’ve tested have ACH50 numbers of 10 or more, and some have been much, much higher. Today’s high-performance houses typically have ACH50s closer to 1.0.  The last five houses that Sisler Builders completed all have ACH50 of less than 0.85.

Coast to Coast on a Vintage Harley

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Coast to Coast on Vintage HarleyBy Richard Duda

Retired Sisler Builders employee

In September 2014 I had the honor and pleasure of taking part in the Motorcycle Cannonball, a coast-to-coast race for antique motorcycles. The Motorcycle Cannonball began in 2010 and is run every other year. The route—3,938 miles from Daytona to Tacoma—is mostly back roads and takes 17 days to complete, including a rest day in Kansas.

There were 102 riders; 25 were from foreign countries, 4 were women, and one was a sidecar with husband and wife. The rules are fairly simple. Bikes are divided into three classes, based on motor size. Riders have to leave the start every morning by a certain time, and finish the day within a specified time.

Coast to Coast on Vintage HarleyFor this race I had decided to build a 1924 Henderson, and started working on it 16 months ahead of time. I finished the day before shipping it to the start in Daytona, but at the last minute I decided it was not ready. Instead, I took my 1936 Harley VLH, which I have owned for about 12 years. The vintage Harley is my daily rider and an old friend.

Coast to Coast on Vintage HarleyI teamed up with a friend, Dan Emerson, from Connecticut. We bought a 1988 Ford van as our chase vehicle and loaded it with bikes, spare parts, gear, and clothing. Dan and his wife, Karen, drove it to Daytona. I flew down, and once there had two days to get my Harley ready.

During the day, riders were on their own. We could help each other or get help from someone along the way, but nothing from our crew. On the sixth day, 30 miles from the start, I lost my rear brake at a stop sign in the middle of farm country. Within five minutes a farmer stopped and asked if he could help. We went to his barn and welded my rear brake rod back together. It put me behind, but I still finished that day on time.

Many of the bikes were well prepared and riders had lots of spare parts and experienced mechanics, but old bikes and old parts will fail. Riding between 250 and 320 miles each day will test the skill of anyone. It is a difficult race physically, emotionally, and mechanically.

Coast to Coast on Vintage HarleyThe day after the rest in Kansas, my motor of my vintage Harley seized. I was in trouble. One of the sweep vehicles was a new BMW bike with a flat side car for hauling bikes. Feeling like the grim reaper, the driver stopped for me. I asked for a few minutes and pumped oil into the cylinder. Fortunately, the piston loosened up and the bike started!

I loved the ride through the East and was surprised with the Midwest’s rolling hills. The West felt stark and barren. One day we rode over Loveland Pass, and at 12,000 feet elevation it was formidable, but everyone running that day made it. The Northwest was great, with huge hay farms and wheat farms and then into the fruit orchards of the upper Northwest.

We ended at the LeMay car museum in Tacoma. The winner was the rider from South Africa on a 1922 Indian Scout. Twenty five bikers, including Dan and me, finished with perfect scores. Afterwards we loaded our van with the bikes, gear, and dirty laundry and shipped it back to the East Coast while we flew home.

It was an amazing experience and thankfully I had a few sponsors: Hiedenaur tires, Spectro oil, and Ande Rooney, Inc. Sisler Builders was a generous supporter, allowing me to take three weeks off from work. I could not have done it without everyone’s help, and of course the patience and support of my wife and family.

Custom Home Gets Unique Front Door

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unique front doorWhen woodworker Glen Waller saw old wooden dam gates lying on top of a burn pile, there was no way he would let them go up in flames. They came from the Lamoille River dam in Morrisville, Vt., and the time had come to replace them with new metal gates. Even though they had been relegated to the excavator’s burn pile, Waller knew they had value and that someday he’d find a use for them. He salvaged the dam gates and stashed them in a storage unit, along with other slabs of wood he’d similarly reclaimed.

Five years later, the center-cut oak gates found a new purpose as the unique front door to a custom home by Sisler Builders. The wood had been submerged for about 80 years and look as though they’d been sandblasted by the volume of water sloshing against them. They’ve also been naturally ebonized by the reaction of the steel I-beams and rods that held the gates together, with the natural tannins in the wood. Waller removed I-beams and other fixtures before storing the gates for five years.

unique front doorCushman Design Group of Stowe, who designed the house, also designed the the unique front door. “We like working with creative designers and architects like Cushman. They create the designs and the vision, they give us the leeway to design-build as we see fit, as long as their overall vision comes to fruition,” said Seth Allen, Waller’s co-worker in the woodworking division at Sisler Builders.

It took Waller and Allen over 600 hours to reclaim the oak dam gates and give them their new life. The client had wanted a unique front door, and is overjoyed with the end result.

 Click HERE for more about Sisler Builders’ creative woodworking division.

Meet Sisler Builders’ Custom Woodworking Division

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Sisler Builders' custom woodworking division
Claro walnut coffee table.

Seth Allen and Glen Waller make up the core of Sisler Builders’ custom woodworking division. Allen was hired in early 2012 as a carpenter and soon moved into the wood shop to build furniture for Sisler Builders’ clients. Shortly after, Waller was brought on to help collaborate on a large order of custom furniture that included three separate pieces—an architecturally designed, high-end walnut master bed with AV cabinets, drawers, and an oversized headboard; a claro walnut (Juglans hindsii) coffee table; and a black walnut (Juglans californica) dining room table. Sisler Builders’ custom woodworking division was launched!

Sisler Builders' custom woodworking division
Custom kitchen shelving.

“We are not set up for high volume,” notes Waller. “We do specialty things, such as master vanities, full kitchens with interiors made of poplar, not plywood, for non-toxic houses, built-in cabinets, and furniture.”

The woodworking shop is modest, completely kitted out with Powermatic tools. The only element that is off-site is a spray room. “We do mostly natural oil finishes. A lot of present-day finishing systems only require one or two coats, so we rarely need a spray room,” Waller adds.

Sisler Builders' custom woodworking division
Glen Waller and Seth Allen doing their thing in Sisler Builders’ woodworking shop.

Waller and Allen both became interested in woodworking when they were kids. Waller’s father was an aerospace engineer with a woodworking shop at home. This in itself was enough to inspire young Waller to take woodworking classes throughout his school years. He also enjoys metal fabrication. He moved to Vermont from California, and prior to joining Sisler Builders owned a custom door-making business in Moscow, Vermont.

Sisler Builders' custom woodworking division
Cozy reading nook.

Allen modestly claims he received his own training from the school of hard knocks, but he also attended Vermont Technical College’s architectural design and engineering program, as well as wooden boat school. After graduating from high school he worked for a high-end construction company in Southern Vermont, where he built homes from the ground up, getting involved in all aspects of building.

Allen later moved to NYC to chase his girlfriend, who he eventually married. “I didn’t want to build houses and lug tools, so I started working in wood shops in New York City and that is where my love for furniture and woodshops began,” says Allen. Woodworking also runs in his family. His father owned a construction business and his father-in-law is Johannes Michelsen, a world-renown wood turner known for his amazing wooden hats.

Most of the custom woodworking projects come from Sisler Builder clients who are having new houses built or major renovations done. “Our clients don’t usually want to stick with a set design. They want the flexibility to make changes along the way,” Allen explains. This gives Sisler Builders the ability to achieve anything their clients dream up. So instead of contracting out furniture and custom projects, he and Waller do the custom work in house.

Sisler Builders' custom woodworking division
A miniature prototype of a custom bench that can be raised and lowered according to snow depth.

“We get some interesting projects,” says Waller. “We recently did an outdoor bench that can be raised and lowered, according to snow depth, using a marriage of steel and wood to create a gear mechanism that is operated manually with a hand crank.” Waller was able to employ his metal fabricating skills to design the gearing.

Sisler Builders' custom woodworking division
Staircase treads and railing.

Other creative projects the two have completed are a suspended outdoor shower enclosure made from a reclaimed hot tub, a shuffle board table, a bamboo-cladded front door assembly, and a custom live-edge Douglas fir bench.

“We can do almost anything custom,” says Waller. “If we can’t do some aspects of a the project we will find someone we respect who can, but for the most part we do everything in house.”

 

Custom Cabinet Displays Stowe’s Skiing History

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Sisler Builders of Stowe, Vt., collaborated with Vermont Ski & Snowboard Museum to create a cabinet that displays, in a unique way, Stowe’s skiing history and artifacts from the museum’s collection. The cabinet is located in the Adventure Center at Spruce Peak, where visitors can walk right up, view the items at eye level, and get a sense of the history and evolution of Alpine skiing.

Stowe's Skiing HistorySeth Allen, custom woodworking division manager for Sisler Builders, said it took about four weeks to design and build the cabinet and another week to install it. Master woodworker Glen Waller finalized measurements and the design, and built it with Craig Gants and Allen. “Everything was built with blind fasteners. You can’t see any screws or hanging devices,” Allen explains.

The team took measurements of each individual ski item and built “boxes” sized precisely to each item’s dimensions. Like assembling a puzzle, they organized the boxes to create a final display measuring approximately 20 feet long by 8 feet high. They used prefinished maple and whitewashed raw maple plywood, with exquisite attention to detail. The museum provided materials, while Sisler Builders donated the design, knowledge, and craftsmanship to create the custom display case.

Stowe's Skiing History    Stowe's Skiing History

Owner Steve Sisler, a longtime skier and ski history enthusiast, was happy to donate his company’s expertise to build the cabinet for the Vermont Ski & Snowboard Museum so that visitors to Stowe Mountain Resort could enjoy a different perspective of Alpine skiing.

For more information contact Sisler Builders or call 802-253-5672.

 

Air Source Heat Pumps – Renewable Resource Heating

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Air source heat pumps and ground source heat pumps are gaining a foothold in the construction industry for their energy efficiency and cost effectiveness. For decades, Sisler Builders installed propane (and sometimes oil) heating equipment as a matter of course. The advent of heat-pump technology and, to a lesser extent, rising fuel prices, has changed all of that.

For the last few years, Sisler Builders installed air source or ground source heat pumps in almost all of their buildings. The technology for heat pumps, which are essentially air conditioners that run in reverse, has improved drastically in the last 20 years. On average, the systems are now four times more efficient than traditional electric resistance heat, operate well (even in Vermont winters) and cost less to operate than propane or oil.

In 2013 Sisler Builders installed air source heat pumps in one of their apartment buildings in Waterbury, Vermont. It replaced an old and outdated oil boiler. The annual heating and hot water costs of the building have gone from about $8,000 to $2,500 annually! And, since almost all of the electricity comes from a rooftop solar array, the system is much better for the environment, too.

To learn more about air source and ground source heat pumps, go to GreenBuildingAdvisor.com and search for Nick Sisler. Nick is co-founder and lead engineer at Ekotrope, a building energy software and consulting company. This essay is adapted from an article in Green Building Advisor.

Two Energy Efficient Vermont Homes

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Here is an up-close look at two energy efficient Vermont homes built by Sisler Builders in Stowe, Vermont.

Ernie Ruskey and Laurie Wood had three primary objectives when they built their house in Morrisville: simplicity, energy efficiency, and harmony with the site. They achieved their goals with a minimalist modern design, a home that is super tight, has excellent air exchange rate results, and heats easily with propane and supplemental wood. The house is nestled on a gentle, wooded hillside, with mountains views to the west, and blends unobtrusively with its surroundings.

energy efficient vermont homes  energy efficient vermont homes

energy efficient vermont homes“One goal in all of our work is to have a house that fits into the site and landscape. It’s always about the view and topography,” says Ernie, architect and owner of Tektonika Studio Architects in Stowe. He designed their house, which has a wedge shape that is, shall we say, wedged into the site’s natural topography. The garage is a half-story down, connected by an open, covered walkway leading to the staircase and main entry. Passing through the mudroom and kitchen to the light-filled great room you notice the subtle widening of the space. In consort with the nine-foot ceilings, expansive west-facing windows, well detailed maple stairwell, and natural stone hearth, this is a truly inviting space. A deck and screened porch off the wide end enable outdoor living close to nature.

energy efficient vermont homes  energy efficient vermont homes

As a Stowe architect, Ernie knows many local builders, and choosing one to build a house he designed for his family was a difficult decision. “I gave several builders a shot,” he says. “Sisler Builders was on the short list of three companies. Their bid was the middle number and it felt realistic. I also felt good about the company’s project-management skills and their deep energy-efficiency knowledge.

energy efficient vermont homesSisler Builders’ core tenet is building the tightest envelope possible at a cost that doesn’t break the budget. Their seven years of focused home energy analysis and retrofits has shown them where typical problems are, especially for air and heat leakage. Whether building a new house or an addition, their crews know what to do to make sure there are no egregious air leaks in places that are difficult, costly, or impossible to fix later.

energy efficient vermont homesAesthetics were also important for Ernie and Laurie. “Sisler Builders made the right matches with their subcontractors. The craftsmanship is superior and from a design standpoint it really worked for me,” Ernie explains. “The costing piece, team, scheduling, and experience are all important, but most important in any building process is a good rapport. Steve communicates well and our personalities clicked. Laurie and I both had, and have, a good feeling about him.”

 

Jo and Jonathan (JP) Poole of Concord, Mass., had similar goals when building their house in Stowe. Simplicity was their primary objective. They wanted a modern design, small enough to feel cozy, yet large enough to accommodate guests. They also wanted a house that was ecologically friendly and sustainable, which led them to a solar-powered geothermal heating and cooling system which uses only renewable resources.

energy efficient vermont homes  energy efficient vermont homes

When the Pooles moved from the United Kingdom to the United States, they first came to Stowe. They ended up in Concord, Mass., where JP works in biotech and Jo owns Concord Fitsquad. They continued visiting Stowe, and when it was time to build their house they reached out to Sisler Builders, whom they had heard about around town, particularly in the context of highly energy-efficient, ecologically friendly construction.

“We set up a meeting with Steve Sisler and liked his practical approach,” JP says. When it was time to find an architect, Steve recommended Ernie Ruskey of Tektonika Studio Architects. “Steve thought Ernie would be a good match for us. His tastes, design perspective, and core interests were aligned with ours.”

energy efficient vermont homes  energy efficient vermont homes

At both the Poole and Ruskey-Wood residences, Sisler Builders implemented a combination of recently introduced energy efficiency building products and practices. When building the envelopes they used Huber’s superior Zip-R wall-sheathing panel and proprietary tape. With careful application of the tape at all seams you can cost-effectively ensure a tight building envelope even before insulation is applied. Sisler Builders did that at both homes, achieving air exchange level’s really close to the rigorous Passive House Institute US best practice standards, and they did it cost effectively.

energy efficient vermont homesThe Poole house begins with the main-floor mudroom, which includes a huge, open-riser, three-story, steel-supported staircase. Beyond that is the heart of the home, a spacious and airy great room/kitchen/dining room. “The mud room and open-plan living area were primary for us. We focused our resources there and on the staircase,” JP notes.

The house is entirely electrically driven, with LED lighting throughout. Radiant heat is powered by a closed loop geothermal system supplemented with a modern Hearthstone soapstone wood stove. Their 4.9 kW solar array provides about 70 percent of all the electricity the home uses.

It’s the only modern style house in their neigh-borhood, yet it’s inconspicuous and unassuming. JP and Jo concur that at the end of the day they were really happy with the final product. “Steve quickly found solutions to challenges and was sensible and direct. Our house is simple and clean and that means the quality of work is extra important. Sisler Builders, their crew, and subcontractors provided excellent craftsmanship. It was a good team.”

Vermont Home Energy Audits

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One of the best ways for homeowners to reduce their carbon footprint starts with home energy audits. Within hours they learn how efficient their home is and what they can do to improve it. Another way is to build a home that meets or exceeds state energy efficiency standards.

Research has shown that housing accounts for approximately 40 percent of energy usage. If everyone took steps for making old and new homes more efficient, that number could be cut in half.

In 2010, when the country was reeling from the Great Recession, Sisler Builders created a division within their company that focuses on energy efficiency in current and future homes. “I’ve always been interested in making our building envelopes as tight as possible,” says president Steve Sisler. “I saw the energy efficiency training for my staff as a symbiotic benefit. We would learn methods to make our new home projects better, while learning how to enhance older homes. We were in a recession and this seemed to me an excellent alternative to layoffs.”

home energy auditsSisler Builder’s energy division has grown to include six employees. Mike D’Muhala is the technical and “science guy,” while Brian Irwin is the business manager and marketing director. A crew of four does home energy audits, installations, and retrofits. Since 2010 they have performed several hundred home energy audits, resulting in over 160 home and commercial energy retrofits. To date D’Muhala estimates that these customers have saved 16 billion BTUs and 109 thousand kilowatt hours of electricity. This equates to about a quarter million dollars in savings and a 2,000-ton reduction in CO2 emissions, roughly the same as removing 500 cars from the road for one year.

home energy audits“The most common problem we see when we do home energy audits is air leakage,” says D’Muhala. “We partner with Efficiency Vermont, and they will give a $1,000 rebate if a client reduces air leakage by 35 percent. This can be done primarily through blower door-assisted air sealing of the attic deck, basement, and living spaces.” Additional incentives are available for upgrading insulation and heating systems.

home energy auditsSisler Builders charges $450 for home energy audits and Efficiency Vermont gives an instant $100 rebate, so the cost to the customer is $350 for a typical house. D’Muhala conducts the audit, spending an average of three to four hours on site, inspecting and conducting tests. He uses a blower door, a machine that measures the air tightness of buildings, and a thermal camera to locate air leakage sites.

D’Muhala then puts together an energy model of the home which he uses to generate a list of recommendations including their costs, energy savings, and estimates of Efficiency Vermont rebates. This model can be tweaked to meet budget, lifestyle, and aesthetic preferences.

“If a house is already tight, we can still find ways to make it even tighter,” D’Muhala says. “Once a house is pretty tight it requires a heat recovery ventilator, which brings fresh air into the house through a heat exchanger. It’s all about ventilation. Send the stale, moist air out and bring the fresh air in.”

D’Muhala has been imparting the lessons he’s learned to the site supervisors and carpenters involved in Sisler Builders’ new home and significant remodel projects. The symbiotic relationship Steve Sisler was hoping for in 2010 has borne fruit! Of the six new homes they completed since 2012, all have exceeded the rigorous state-mandated testing amounts by at least 300 percent. One earned kudos from Efficiency Vermont Senior Energy Consultant TJ Holloway when he noted, “The air density (temperature) corrected blower door number is 509 CFM. This is really, really tight! Passive house tight.” This attention to detail results in reduced energy consumption, pollution, and maintenance coupled with increased interior comfort.

Sisler Builders is a member of Efficiency Vermont’s Home Performance with ENERGY STAR program and their Efficiency Excellence Network. To schedule an energy audit or for information about reducing your carbon footprint call Brian Irwin at Sisler Builders, 802-253-5672.