BE Boston 19 RegistrantsBE Boston 20 RegistrantsBE Boston 21 RegistrantsBottom Lines - FacilitatorBottom Lines - Plan ByggBottom Lines - Steering CommitteeBusiness MemberGreen Company ManagerMember
After a wide range of carpentry jobs and a bachelor's degree in History and Literature of Medieval Europe, Paul Eldrenkamp founded Byggmeister (Scandinavian for "master builder") in 1983. "I've always put a high priority on two things: fostering easy, friendly relations with our clients and building a team of people who are as interesting and diverse as they are talented and dedicated." Paul is a widely-recognized expert in high-performance homes and frequently speaks to industry groups and the public about energy efficient construction. He is also a founding partner of The DEAP Energy Group, a consulting partnership focusing on Passive House, zero-net energy, other high-efficiency building standards.
Other Team Members
Dave Legg, Oliver Klein, Marie McMahon
Deep Energy Retrofit Program Sponsor
Gary Bergeron, David Joyce, Alex Cheimets, Brad King
Mark Durrenberger, Jonathan Williams
New England Clean Energy
European Architectural Supply
High Performance Windows
Barry Stephenson, Aubrey Gewehr
HRV & Ventilation
Building Science Corporation
VP / Branch Manager
Home Equity Loan, Heat Loan
After shivering for 20 winters inside their drafty 1576 sq ft 1945 Garrison Colonial in Melrose, MA, owners David Fink and Barbara Simko requested a MassSave energy audit. The auditor stated that the house would be an excellent candidate for the National Grid DER program. Thus began their journey towards zero net energy.
The owners initially planned to remodel the house by replacing the kitchen and building an addition. Working with architect Steve Baczek and energy efficiency specialist Mike Duclos, the design gradually evolved via the National Grid DER program to one that did not add square footage. Instead, the project focused on energy efficiency, making super-insulation improvements per DER guidelines, lowering window heat loss, increasing window solar gain, and recovering living space occupied by obsolete mechanical systems.
The super-insulated all-electric DER renovation home includes full envelope insulation and air sealing, high solar gain triple pane windows, new doors, and new heating and ventilation equipment. The chimney and existing oil fired steam heating system were removed and replaced by two mini-split air source heat pumps. The existing gas hot water heater was replaced by an electric heat pump water heater. An HRV was added to recover exhaust air heat and provide adequate ventilation. A drain water heat recovery heat exchanger was installed in the basement to recover heat energy normally lost down the shower drains. Because the southern facing main roof was ideal for PV, a high efficiency PV array was added to solar power the house to reach the zero net energy goal. The project was completed in October 2013.
The DER project was one of six NESEA ZNEBA finalists in March 2015. For a 1 year time period starting on Jan 7th of 2014, actual performance exceeded zero net energy. Measured performance was:
9103 kWh - PV Energy Production (=100%)
8395 kWh - House Energy Usage (=92.2% of PV Production)
0708 kWh - Net Energy Surplus to Grid (=7.8% of PV Production)
Basis of Performance Claim
Conditioned Floor Area
2,706 sq ft
Total Cost of Project
Energy Data Type
Renewable Energy System Type(s)
Annual renewable energy generated
Envelope and Mechanicals
2 in XPS rigid foam (R-5/in) over existing concrete slab with drain mat below + 3/4 in plywood (R-1.25/in) flooring above.
Foundation wall assembly
2 in of XPS rigid foam (R-5/in) + 2 in of polyiso rigid foam (R-6.5/in), 3 in closed cell spray foam on rim joists, 0.4 in Spaceloft (R-10.3/in) used instead of polyiso near stairway to reduce thickness and maintain reasonable stair width
Above grade wall assembly
4 in of polyiso rigid foam (R-6.5/in) on exterior + 3.5 in of blown cellulose (R-3.4/in) in original wall cavities + 3/4 in plywood (R-1.25 /in) sheathing + 0.75 inch dead air space (R-1.0/in) + 0.5 inch gypsum board (R-0.9/in) + 5/16 in cement board siding (R-0.48/in)
2 First Floor Entry Doors - Fiberglass, Therma-Tru, R-4, R-5.3
2 Basement Entry Fire Doors - Fiberglass, Therma Tru, R-7.1 base door
On basement doors, added 0.4 in Spaceloft (R-10.3/in) + 2.0 in XPS (R-5/in) to achieve R-21.2
Door average Rval = 7.4
Door average U = 1/7.4 = 0.14