Articles With "residential" Tag

Petworth Rowhouse Received a Net-Zero Rating

composite

Washington-based builder Tanya Topolewski recently completed the rehab of a 90-year-old rowhouse in the Petworth neighborhood of Washington DC at 411 Varnum Street. The four bedroom and 3.5 bathroom rowhouse was rebuilt from the ground up with the aim of achieving net zero status. The builders are also seeking the LEED Platinum certification for the house.

batroom

 

The final design went through 15 alterations before the right mix of energy efficiency was settled upon. The east-west position of the house was a hindrance, but the roof was fitted with the maximum number of solar panels that it can hold, which are designed to provide the energy for the entire house. The solar panels were all installed at the maximum 25-degree tilt, since a greater angle would have been a wind hazard. On the final audit, the house received a 0 score on the HERS index. However, the auditor warned that whether the solar panels will produce sufficient energy to keep the house at net-zero will depend on the energy usage habits of the new owner.

All exterior walls of the house were insulated to between R25 to R35, which was achieved through the use of dense pack cellulose or dense pack cellulose and polyiso board. Since the HVAC systems design has a considerable impact on energy efficiency, the air handler was placed inside the building envelope. All except one duct are also placed inside the envelope. All of these ducts are in inside spaces, except for the lines in the attic and those lines are buried under a minimum of 10 inches of insulation.

To ensure maximum sealing, low expansion spray foam was used around the doors and windows, while regular expansion spray foam was used to seal the penetrations to the exterior, floor to floor penetrations, and behind band joists. In addition to that, caulk was used to further seal all the framing seams, cracks, joints, corners and sill plates. The drywall was glued to the studs and joists, while the exterior rigid board was overlapped and tape sealed.

The house was fitted with a 15 SEER/8.7 HSPF high efficiency heat pump system, making in 20% more efficient than the minimum required 13 SEER. Furthermore, the house’s HSPF is 8.7, which falls into most the efficient heat pumps range of between 8 to 10. The attic of the rowhouse if also insulated to minimum R60 with blow in cellulose at a depth of 16-20 inches.

The house was also fitted with Energy Star appliances and low-flow fixtures to maximize water efficiency. The windows and doors installed have ratings of SHGC .3 or better and U-factor .3 or better.

During the reconstruction, many items, such as door, window and base trim, interior doors and interior door hardware (handles, mortise locks, decorative plates, hinges and keys), vintage lighting, bath fixtures, framing lumber including studs, 2×6, 2×8, 2×10 and larger and hardwood flooring were removed, cleaned, stored and reused in the final construction.

The costs of the green elements of the house came to $50,000, which includes $25,000 for the solar panels, $10,000 for the energy recovery ventilator, heat pump, hot water heater, windows and insulation, and $15,000 to meet the requirements of the LEED Platinum certification. The house recently sold for $725,000 to Florence Petizon.

kitchen

 

window insul

insulation

 

Merritt Crossing Senior Apartments Named One of 2013 AIA COTE Top Ten Green Projects

Green-Building

The Oakland, CA Merritt Crossing Senior Apartments consist of 70 units, which are reserved for senior citizens with incomes between 30 and 50 percent of the area’s median income. Over half of the apartments in the complex are reserved for the homeless, those at risk of homelessness, or those living with HIV/AIDS. The project was named one of the top ten green projects by AIA COTE in 2013. The building has received the LEED Platinum certification, as well as the Build It Green and Energy Star certifications.

Read more »

Virginia Homeowners Build a Passivhaus on a Budget

Dan Ernst - exterior south elevation.case study preview

When it came time to make a home together, Jason and Stephanie Specht wanted to build a sustainable house in Thaxton, VA which is classified as a Climate Zone 4A. Upon consultation with the representatives of Structures Design/Build company they opted for a Passivhaus design. The custom optimized Passivhaus design created by Structures Design/Build allowed the Spechts to achieve cost parity with traditional construction.

Read more »

Homeowners in Elizabethtown Opt for Sustainable Seam Metal Roof Panels

Roof

The Keith family from Elizabethtown, KY was disappointed with the short lifespan of classic asphalt shingles covering their roof. Only six years after the last replacement, they were once again forced to reroof. Looking for a longer lasting and more sustainable solution, they opted for seam metal panels made by Metal Sales. These metal panels are durable, elegant, energy efficient and sustainable.

The Keith residence is a modern Mediterranean style home with a taupe-colored stone exterior and dark bronze accents on windows and doors. Aesthetically, the metal roofing panels blend in with the other design elements of the house perfectly. The Keith’s roof was covered by 110 squares of Metal Sales’ 24 gauge, 16” wide Vertical Seam panels with a PVDF (Kynar 500®) finish in the Dark Bronze color. Since the metal panels come in a variety of colors, the homeowners where able to choose the color that best complements the exterior color scheme of their home.

Read more »

Florida Contractor Builds the First Luxury Net Zero Energy Home

exteriorlux

Marc Rutenberg, the CEO of the Florida company Marc Rutenberg Homes, has recently successfully designed and built a luxury home that complies with and even surpasses all Energy Star standards and is LEED Platinum certified. The Castaway III, as the house is called, measures 4,552-square feet, which is about 3,100 square feet larger than the average zero-energy home. This house proves that there is no need to sacrifice comfort and luxury to reduce one’s carbon footprint.

Read more »

Modular Homes Are a Great Solution For Hurricane Sandy Victims

finished

The Philadelphia home builders John Westrum Homes have recently built a model modular home in Seaside Heights, NJ, the area where last year’s hurricane Sandy destroyed or damaged 2,200 of 2,400 bungalows and homes. The prototype was constructed to exceed post-hurricane Sandy construction standards of modular components.

Read more »



Popular Topics on Jetson Green