• 253-858-7472

Coopers Hawk Terrace Phase II

Sonora, CA

Participant information

Premier Building Systems
Laurie A. Miller
1420 Washington Avenue
Puyallup, WA 98375
Phone: 253-846-6033
Email Address: laurie.miller@premiersips.com
Website: www.premiersips.com



High Performance: Yes

Project information

Coopers Hawk Terrace Phase II
Sonora, CA 95370

Date Completed: December 2020

Dimensions of building: 32' x 72'

Total sq. ft. of conditioned space: 2,304 sq. ft. per duplex, 1,152 sq. ft. per unit

Built By (if different than applicant)

Delillo Contracting
Dale Delillo
23656 Porcina Way
Columbia, CA 95310

Panels Manufactured By: Premier Building Systems LLC

Designed By (if different than applicant - SIPA will only recognize members)

Zero-Energy Plans LLC
Ted L. Clifton
107 S. Main Street, Suite A201
Coupeville, WA 98239

Total sq. ft. of conditioned space:
2,304 sq. ft. per duplex, 1,152 sq. ft. per unit

Describe the end use of the building:
Multifamily duplex development

How did SIP construction help you get this job?
Speed of construction & high performance requirements, zero-energy mandate, wildlands-urban interface code

SIP wall thickness and core material:
5.5" core graphite-infused SIPs

SIP roof thickness and core material:
6" core graphite-infused SIPS, over R-15 batts in top chord of truss

Describe the benefits of using SIPs on this project. Did SIPs help save time, labor, construction costs, or energy?
SIPs provide superior insulation and air-sealing, while eliminating the need to vent the attic, which is a big deal when it comes to the Wildlands-Urban Interface Code. Construction time was also a factor, as site labor is increasingly in short supply

Describe any innovative design elements or structural engineering involved:
The SIPs -over-Truss construction allows longer spans, while keeping some attic space for duct-work and fire suppression systems. The use of R-15 batts in the top chord of the truss beneath the R-28 SIPS panel gives us a well air-sealed R-43 assembly, with no thermal bridging. Gable end walls go all the way to the bottom of the SIPS panel, which provides all the overhangs, without requiring additional framing.

Please list any certifications the project received, such as ENERGY STAR, LEED, National Green Building Standard, WELL, Passive House, Green Globes or local green building programs. Only list certifications that are completed:
WELL, Passive House, Green Globes or local green building programs. Only list certifications that are completed:
This project was designed to the US DOE Zero-Energy-Ready standard, which includes EPA Indoor Air Plus. I do not know if testing was done or if the project was certified. They have a different (non0HERS) system in CA.

Describe the HVAC system used on the project:
Each unit uses a Mitsubishi Ductless heat pump for heating and cooling, and features a tier-3 heat pump water heater for domestic hot water.

Describe any other energy-saving materials used in the building envelope other than SIPs. List U-values of windows used and the U or R-value of any insulation materials:
Vinyltek triple-pane windows were used, with low SHGC and a U-value of 0.16

Please list any energy-efficient products or design features, such as lighting, hot water heating, appliances, passive solar:
All appliances were the lowest energy-use in their respective categories. 100% of lighting is LED. The homes were designed to receive maximum benefit from their passive design. Water heating, mentioned above, is at a Co-efficient of Performance of 3.35

Were any solar panels installed on the project? If so, indicate the size of the system:
Solar panels were designed in from the beginning, but not yet installed due to issues with PG&E. With solar panels on the garages only, these units will completely power themselves and the owners cars (two cars per unit at 10,00 miles per car per year). With the entire south-facing roofs fitted with solar panels, these 18 residential units would power themselves, AND an addition 54 average existing homes in the neighborhood.

Please list any sustainable materials or design features not listed above, such as recycled materials, low-VOC finishes, landscaping, etc.:
Exteriors are all Hardi-plank, Hardi-panel, and Hardi-trim, for fire-proof exteriors. The roofs are all steel standing-seam roofing, for the same reason. The finished floors are all dyed concrete.

Any additional comments on the project:
The 6" GPS roof panels were set on standard trusses. There is no overhang on the trusses and no bird-blocking...only solid blocking between trusses in accordance to the Wildlands - Urban Interface Code. The bottom chord f the trusses provides a fully enclosed attic completely inside the SIPS building envelope, with only the ends of the trusses needing to be spray-foamed.
The required sprinkler system is free to run along the bottom chord of the trusses. The combination of Hardi-Siding, and Hardi-Soffit along with all the tempered glass in the windows and the steel roofing provide a fireproof exterior shell. This is something to be touted widely.
PG&E, get out of our way!!!

Click on a photo to enlarge.

Builder Information

Delillo Contracting
Dale Delillo23656 Porcina Way
Columbia, CA 95310

Phone: 510-468-8253

Panels manufactured by Premier Building Systems LLC.

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