• 253-858-7472

Affordable Community SIP Housing SD

Porcupine, SD

Participant information:
Charlie Ewalt, Roberta Bartel
3100 9th Ave SE
Watertown, SD 57201
Phone: 605-882-2222
Email Address: enercept@enercept.com
Website: www.enercept.com

Category: Affordable Housing

Project information:
Thunder Valley CDC (Regenerative Community) House
Porcupine, SD 57772

Date Completed: July 2018

Dimensions of building: First and second floors: 26' x 26' with attic bonus space for storage

Total sq. ft. of conditioned space: 1,448 sq. ft.

Built By:
Thunder Valley CDC and homeowners
290 Empowerment Drive
Porcupine, SD 57772

Panels Manufactured By: Enercept, Inc.


Designed By:

Pyatt Studios
Rob Pyatt
1445 Pearl St #209
Boulder, CO 80302

Describe the end use of the building:
The home is part of the Thunder Valley Regenerative Community located on the Pine Ridge Indian Reservation. Each unit is a single family home for low to moderate income Native American families.

How did SIP construction help you get this job?
The developers are creating climate change resilient homes. SIP construction fit well because of the improved energy efficiency they offer.
Thunder Valley CDC has limited construction crews and wanted a building system that would go up quickly and that the homeowners could participate in.
Rural utilities are generally more expensive, by building energy efficient housing ownership becomes more affordable.

SIP wall thickness and core material: 6" walls with EPS solid insulating core
SIP roof thickness and core material: 12" roof with EPS solid insulating core

Describe the benefits of using SIPs on this project. Did SIPs help save time, labor, construction costs, or energy?
Using SIPs allowed a very inexperienced crew and homeowners the ability to frame up the house and create an air-tight exterior shell.


Describe any innovative design elements or structural engineering involved:
The home was designed to maximize passive and active solar potential. The roof pitch has been adjusted for ideal solar gain and equipped with solar panels. The covered porch proves passive cooling.

Energy use intensity in kBtu/ft2:
14,500 kwh/year x 3.412 = 49,474


Describe the HVAC system used on the project:
High performance integrated space and water heating system with inverter heat pump for cooling/ dehumidification, energy recovery ventilator, and high-efficiency filter - all delivered through a small duct distribution system.


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:
Windows: 0.27 U-Value 0.20 SHGC; Slab and Foundation Insulation = R-12; 6 KW PV System; Covered Porch for Passive Cooling & Sun Protection; High SRI standing-seam metal roof for reduced heat gain

Please list any energy-efficient products or design features, such as lighting, hot water heating, appliances, passive solar:
LED lighting; Hydronic floor heat; Energy Star appliances; Low Flow Water Fixtures

Were any solar panels installed on the project?:
Yes, 6KW PV system


Please list any sustainable materials or design features not listed above, such as recycled materials, low-VOC finishes, landscaping, etc.:
Low or no VOC finishes were used.
The shared space and yards are seeded with native prairie grasses and shrubs.

Any additional comments on the project:
This house is one of seven units supplied. The homes were designed to be built through a sweat- equity and training model that resulted in between 15- 30% cost savings for low income Native American families living in the development.
Each home comes with a 'Homeowner's Guide' that include instructions on keeping the home safe, healthy, and green.

Click on a photo to enlarge.

Builder Information

Thunder Valley CDC and homeowners290 Empowerment Drive
Porcupine, SD 57772

Phone: 605-455-2700

Panels manufactured by Enercept.

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