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A closer look: Overall winner of SIPA’s 2017 Building Excellence Awards

via SIPA

Project information:
Parfitt Residence
Anacortes, WA 98221

Date Completed: 7/01/2016
Total cost of project: $630,000.00
Dimensions of building:
Main Floor = 40’x40′ +/- (1,656 sf),
2nd floor = 38’x32′ (1,216 sf),
3rd floor = 419 sf, total conditioned = 3,291 sf

Total sq. ft. of conditioned space: 3,291 sf

Built By:
CVH Inc. dba Clifton View Homes
Ted L. Clifton
107 S. Main St. Ste. G201
Coupeville, WA 98239
Phone: 360-678-7000
Panels Manufactured By: Premier Building Systems

Designed By:
Zero-Energy Plans LLC
Ted L. Clifton
107 S. Main St. Ste. G201
Coupeville, WA 98239
Phone: 360-969-2363

Single-family home, with mother-in-law suite on the main accessible level.  SIPS construction is one of the primary keys to our company’s success in designing and building Zero-Energy Homes. We are sought after for our skill and experience in using SIPS to achieve outstanding energy efficiency.

SIP wall thickness and core material: 6.5″, 5.5″ EPS core
SIP roof thickness and core material: 10.25″. 9.25″ EPS core

SIPS are the key to tight, energy efficient construction, without the thermal bridging, and on-site labor issues required by conventional stick-framed construction. SIPS also allow our entire roof to be installed and dried in within a single day of work. This allows sub-contractors to be working inside the home much sooner, advancing the schedule by weeks.  The large open rooms on both the main floor and second floor required lots of large beams. The tall ceilings and craftsman style allowed some of those beams to be partially exposed, while still leaving the house with a very open and airy feel. This SIPS roof was engineered using i-joist splines to increase the spans, keeping the attic area open and usable as a hobby room. The view from the attic over the town and yacht basin is spectacular.

DOE Zero-Energy Ready program, which includes Energy Star, and EPA Indoor Air Plus. SICBA Built Green 5-star

HERS Index:  -19
Blower door test results:  0.82 ACH50

HVAC system used on the project: The main floor is heated with a Daikin Altherma air-to-water heat pump, and in-floor radiant heat. The Daikin Altherma also provides the domestic hot water, at about 450% efficient. The second floor and attic are mostly passively heated with the warm air rising from the lower level, but a small Daikin ductless heat pump was installed with a head in the master suite and another in the 2nd floor office in case cooling was ever needed in the summer. These two ductless heads can also provide auxiliary heating if it is ever required

Under-slab insulation is 4″ of XPS foam (R-20); Windows are Vinyltek triple-glazed, triple-low-e with U-values between U.17 and u.21 depending on the opening size and configuration; the Energy-Star appliance package included the dishwasher, and a front-loading washing machine.  All lighting is LED, and ceiling fans are Energy-Star listed.  Domestic water heating is done by the Daikin Altherma heat pump, COP 450.  Glazing is 270-180-i89 (triple low-e) for moderate solar heat gain, but minimal heat loss.

Approximately 8KW of solar panels were installed on the south-facing roof, with room for more when the owners purchase an electric car. Charging facilities were planned for in the electrical panel.

All paints and finishes were low VOC or zero VOC, except for the acid-stained concrete floor in the kitchen and utility areas. A more durable and impervious finish was desired there.  The landscaping included a rain garden for infiltration of storm water, and over 2,000 gallons of additional rainwater catchment and storage for irrigation of other landscaped areas.

This project is a great example of how a very traditional craftsman-style home can be constructed using the latest materials and methods, at the same time achieving futuristic energy efficiencies. The HERS rating of -19 is the lowest we have achieved to date.

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