Standard 1: Energy-Efficiency Requirement The home to be certified must be at least 10 percent more energy efficient than the same home if it were built to current Wisconsin Uniform Dwelling Code. Efficiency is based on total MMBtu consumption as calculated by REM/Rate™ software. Standard 2: Air Tightness Requirement Building air tightness must be equal to or less than 0.20 CFM (cubic feet per minute) per square foot of building shell area when the home is depressurized to minus 50 pascals. Standard 3: Sealed Sump Basin All sump basins must have an air-tight cover with all piping and electrical penetrations sealed. Approved methods of air sealing a sump basin cover are: • A manufactured sump basin cover designed to be air tight. • A custom-fit cover caulked in place. Standard 4: Sealed Plumbing Rough-in Any plumbing rough-in in the slab must be completely air sealed. Code approved material such as foil faced Thermax foam sheathing or pressure treated wood cut to fit and caulked in place are acceptable methods of air sealing. Standard 5: Full Coverage Foundation Insulation The entire foundation wall must be insulated. A minimum of R-5 insulation is required. The insulation can be located on the interior, exterior, or a combination of both. Exclusions: Brick ledges or exposed foundation walls located inside an attached garage, and exposed foundation walls along stairways from the basement into an attached garage. Standard 6: Slab-on-Grade Thermal Isolation In slab-on-grade construction, the concrete slab between the conditioned space and unconditioned space shall be thermally isolated with a minimum R-5 thermal break. Slab-on-grade construction can be defined as a home without a basement or crawl space and excludes concrete steps and porches. The thermal values for complete slab-on-grade construction must meet or exceed current Wisconsin Uniform Dwelling Code requirements (comm. 22.31-1). Standard 7: Whole-House Ventilation A mechanical ventilation system must be installed to provide whole-house ventilation compliant with ASHRAE 62.2-2007 and program requirements. Standard 8: Spot Ventilation for Bathrooms with a Tub or Shower An exhaust ventilation system ducted to the outdoors must be installed. • Exhaust fan: Minimum tested flow of 50 CFM. —OR— • Central exhaust systems: Minimum tested flow of 20 CFM continuous flow with 50 CFM boost capacity. Note: A bathroom exhaust fan can be used to satisfy the Whole-House Ventilation standard. If this is the chosen method of whole-house ventilation, a control device operating the fan must also be installed outside the bathroom and wired in parallel with the fan switch. This control should be labeled as “Whole-House Ventilation.” Ventilation fans with a sone rating of 1 or less are highly recommended. Standard 9: Spot Ventilation for Gas and Electric Ranges An exhaust ventilation system ducted to the outdoors must be installed. Gas Cook Tops: • A range hood or a microwave ventilation system with a minimum rated capacity of 100 CFM. Electric Cook Tops: • A range hood or microwave ventilation system with a minimum rated capacity of 100 CFM. —OR— • A central system with a minimum tested flow of 20 CFM with a pick-up and control switch located in the kitchen. Standard 10: Space Heating and Water Heating System Design Any forced air space heating system must be closed-combustion design with the piping for combustion and exhaust air connected directly to the outdoors. Any boiler space heating system must be of closed combustion or power-vent design. Any gas or liquid propane water heating system must be: • Power-vent design with the piping for the exhaust air connected directly to the outdoors. • Direct-vent design with the piping (pipe within a pipe) for exhaust and combustion air connected directly to the outdoors. • Closed-combustion design with one pipe for the exhaust and one pipe for combustion air connected directly to the outdoors. Electric water heating systems are acceptable, but not recommended, and will have a negative impact on the home’s energy efficiency. Standard 11: Fireplace Design Any gas fireplace must be a direct-vent fully sealed design with the piping for combustion and exhaust air connected directly to the outdoors. Any solid fuel burning fireplace or stove must be a closedcombustion design with the piping for combustion air connected directly to the outdoors. Power-vented pellet stoves must also have a depressurization safety shut off switch. A home’s depressurization shall not exceed negative 50 pascals with the largest ventilation device running. Atmospherically-vented (B-vent) fireplaces or stoves are prohibited. Standard 12: Carbon Monoxide Detectors Carbon monoxide detectors must be installed in any home with combustion equipment or an attached garage. One battery operated, plug-in, or hard-wired carbon monoxide detector is required for each floor with a bedroom. Combination carbon monoxide/smoke detectors are highly recommended. Standard 13: Insulated and Gasketed Attic Access Hatch Any attic access hatch in the conditioned space must be insulated to a minimum R-20 with a perimeter edge gasket. The insulation must be permanently attached to the access hatch. Standard 14: Duct Testing Duct testing per ASHRAE Standard 152 is required when an air-handler, or any ductwork, are located outside the conditioned space. The limit for duct leakage to the outdoors shall not exceed 5 CFM per 100 square feet of conditioned floor area.