The Planet Clark Emerald House (PCEH) will be constructed to meet the criteria for five complementary third-party certification programs, the primary being the National Green Building Standard (ICC 700-2008). The NGBS includes five common green building practice arenas and a sixth category requiring owner education about operation and maintenance.

Site / Lot Design and Development

Where and how a house is built always has an impact on the neighborhood, the community, the environment and the occupants. For PCEH, this will mean:

  • Siting with access to public transit and amenities within one-half mile
  • Using an infill lot
  • Protecting existing trees and non-grading areas
  • Building an 1,154 sq. ft. footprint with 1,010 sq. ft. livable space
  • Using a rain garden for stormwater management
  • Capturing 100 percent of rain water on site for irrigation needs
  • Using pervious pavers to allow natural infiltration of storm water
  • Using a designated concrete clean-out pit

Resource Efficiency

An important part of green building is the conservative use and careful choice of materials for their longevity, environmental responsibility, and ease of maintenance. It is also important to reduce construction waste and recycle wherever possible.

For the exterior, PCEH will include these innovative building practices:

  • Rain screen exterior wall system to protect building exterior from wind-driven rain
  • Eaves extended to a minimum of 24 inches to protect siding and windows
  • Cool paint metal roofing to decrease heat gain in the summer
  • Pre-finished fiber cement siding for durability and ease of maintenance

There will be a Construction Waste Management Plan to include:

  • Recycling or salvage of at least 50 percent of all construction waste by weight generated on-site, including wood, cardboard, and drywall
  • Training all workers in waste handling procedures

Energy Efficiency

The goal for PCEH’s air-tight construction is for one (1) air change per hour at 50 pascals (pa). To put this in perspective, the Northwest Energy Star program carries a maximum requirement of five (5) ACH at 50 pa. To accomplish this and ensure healthy indoor air quality at the same time, the home will be constructed with the following components:

  • Building envelope will use structural insulated panels (SIPs)
    • 8.25” Exterior walls (R-29)
    • 12.25” Roof (R-49)
  • Ductless heat pump with zonal controls will eliminate dust and dirt commonly found in ducts
  • Heat recovery ventilator (HRV) to expel stale and introduce fresh air without wasting energy
  • Energy feedback monitor to let the homeowners know where energy can be saved
  • High performance windows with a U-factor less than .16 and selected to optimize the Solar Heat Gain Coefficient depending on location: North windows at .17; South windows at .42; East and West windows at .33

Water Efficiency

With a goal of using only 22 gallons of water per person per day for all domestic needs. compared to the national average of 70 gppd, the following components and plumbing fixtures will be used:

  • Centrally-located plumbing runs
  • Whole-house pressure regulating valve
  • Low-flow fixtures
    • Showerheads: 2.0/1.75 gpm
    • Faucets: 1.5 gpm
    • Toilets: 0.8 gpf ultra-high-efficiency

To keep water needs to a minimum for external use, the landscaping will include:

  • Native, drought-tolerant plants
  • Hydrozoning for efficient irrigation
  • Rain barrels for irrigation

Indoor Environmental Quality

For healthy indoor air quality (IAQ), it is essential to keep pollutants out of the home. The heat recovery ventilator will introduce fresh air on a scheduled basis, saving energy in the process.

Since Volatile Organic Compounds (VOCs) are potentially harmful and can lead to severe health issues, they will be limited as follows:

  • Less than 150 grams per liter for trim / exterior paints / clear finishes
  • Less than 50 gpl for wall and ceiling latex paint
  • Less than 70 gpl for construction/carpet adhesives
  • No added urea-formaldehyde for cabinetry, millwork, etc.

To restrict potentially toxics fumes, the PCEH was designed with:

  • No attached garage
  • No fireplace or wood stove

To keep dirt to a minimum, there will be only hard surface flooring and no carpeting.

Operations, Maintenance, and Owner Education

Building the house is only the first step. To assure that all the elements of a green home are operated and maintained properly, it is essential that the homeowner know how to do so. Therefore a manual will be compiled during the process and presented to the homeowner. The manual includes particulars about the home and information about options for living more sustainably in the community. It will include:

  • Green Building Certificates
  • Design and construction teams
  • Plans and structural documents
  • Photo record of framing with utilities installed
  • EPA Indoor airPLUS documentation
  • Manual for all water-using equipment or controls installed in the house and yard, including all relevant EPA WaterSense materials on indoor and outdoor water use
  • Green features, including sources of reclaimed materials
  • Product manufacturers’ manuals and product data
  • Local recycling programs and locations
  • Renewable Energy program information from utilities
  • Integrated Pest Management program description and resources
  • Benefits of using energy efficient lighting systems
  • Practices to conserve water and energy
  • Local public transportation options
  • Diagram showing the location of safety valves and controls for major systems.
  • Local service providers who offer regularly scheduled service and maintenance contracts to assure proper performance of equipment and the structure (such as, HVAC, water heating equipment, sealants, caulks, gutter and downspout system, shower and/or tub surrounds, irrigation system)
  • Maintenance checklist
  • Common hazardous materials often used around the building and instructions for proper handling and disposal of these materials
  • Information on organic pest control, fertilizers, deicers, and cleaning products.
  • Information on native landscape materials and/or those that have low-water requirements.
  • Methods for maintaining the building’s relative humidity in the range of 30 to 60 percent