- Storm windows installed over existing fenestration.
- Glass only replacements in an existing sash and frame.
- Existing ceiling, wall, or floor cavities exposed during construction provided that these cavities are filled with insulation.
- Construction where the existing roof, wall, or floor cavity is not exposed.
- Reroofing where the roof is part of the thermal envelope, and where neither the roof sheathing nor the roof insulation is exposed.
- Reroofing where the roof is not part of the thermal envelope.
- Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided, however, that an existing vestibule that separates a conditioned space from the exterior shall not be removed.
- Alterations that replace less than 50% of the luminaries in a space, provided that such alterations do not increase the installed interior lighting power.
- Alterations that replace only the bulb and ballast within the existing luminaries in a space provided that the alteration does not increase the installed interior lighting power.
ABOVE-GRADE WALL. A wall more than 50 percent above grade and enclosing conditioned space. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.
ACCESSIBLE. Admitting close approach as a result of not being guarded by locked doors, elevation or other effective means (see "Readily accessible").
ADDITION. An extension or increase in the conditioned space floor area or height of a building or structure.
AIR BARRIER. Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials.
AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").
BASEMENT WALL. A wall 50 percent or more below grade and enclosing conditioned space.
BUILDING. A combination of materials, whether portable or fixed, forming a structure affording a facility or shelter for use or occupancy by persons, animals, or property. The term does not include a building incidental to the use for agricultural purpo ses of the land on which the building is located if it is not used in the business of retail trade. The term shall be construed as though followed by the words "or part or parts of the building and all equipment in the building" unless the context clearly requires a different meaning.
BUILDING OFFICIAL. The person who is appointed and employed by a governmen tal subdivision, who is charged with the administration and enforcement of the state codes specified in R 408.30499 of the Michigan Building Code, and who is registered in accordance with the requirement s of 1986 PA 54, MCL 338.2301 to 338.2313.
BUILDING SITE. A continguous area of land that is under the ownership or control of one entity.
BUILDING THERMAL ENVELOPE. The basement walls, exterior walls, floor, roof, and any other building elements that enclose conditioned space or provides a boundary between conditioned space and exempt or unconditioned space.
C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h . ft2 . °F) [W/(m2 • K)].
CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.
CONDITIONED SPACE. An area or room within a building being heated or cooled, containing uninsulated ducts, or with a fixed opening directly into an adjacent conditioned space.
CONTINUOUS AIR BARRIER. A combination of materials and assemblies that restrict or prevent the passage of air through the building thermal envelope.
CRAWL SPACE WALL. The opaque portion of a wall that encloses a crawl space and is partially or totally below grade.
CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.
DEMAND RECIRCULATION WATER SYSTEM. A water distribution system where pump(s) prime the service hot water piping with heated water upon demand for hot water.
DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.
DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.
ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.
ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.
ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.
ENTRANCE DOOR. Fenestration products used for ingress, egress and access in nonresidential buildings, including, but not limited to, exterior entrances that utilize latching hardware and automatic closers and contain over 50-percent glass specifically designed to withstand heavy use and possibly abuse.
EXTERIOR WALL. Walls including both above -grade walls and basement walls.
FENESTRATION. Skylights, roof windows, vertical windows (fixed or moveable), opaque doors, glazed doors, glazed block and combination opaque/glazed doors. Fenestration includes products with glass and nonglass glazing materials.
FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factoryformed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.
HEATED SLAB. Slab-on-grade construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.
HIGH-EFFICACY LAMPS. Compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of:
- 60 lumens per watt for lamps over 40 watts;
- 50 lumens per watt for lamps over 15 watts to 40 watts; and
- 40 lumens per watt for lamps 15 watts or less.
INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.
INSULATING SHEATHING. An insulating board with a core material having a minimum R-value of R-2.
LOW-VOLTAGE LIGHTING. Lighting equipment powered through a transformer such as a cable conductor, a rail conductor and track lighting.
MANUAL. Capable of being operated by personal intervention (see "Automatic").
PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use for determining compliance based on total building performance.
READILY ACCESSIBLE. Capable of being reached quickly for operation, renewal or inspection without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders or access equipment (see "Accessible").
REPAIR. The reconstruction or renewal of any part of an existing building.
RESIDENTIAL BUILDING. For this code, includes detached one- and two-family dwellings and multiple singlefamily dwellings (townhouses) as well as Group R-2, R-3 and R-4 buildings three stories or less in height above grade plane.
R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 . °F/Btu) [(m2 . K)/W].
SERVICE WATER HEATING. Supply of hot water for purposes other than comfort heating.
SKYLIGHT. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (1.05 rad) from horizontal. Glazing material in skylights, including unit skylights, solariums, sunrooms, roofs and sloped walls is included in this definition.
SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation which is then reradiated, conducted or convected into the space.
STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement for compliance based on total building performance.
SUNROOM. A one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure's exterior walls and roof.
THERMAL ISOLATION. Physical and space conditioning separation from conditioned space(s). The conditioned space(s) shall be controlled as separate zones for heating and cooling or conditioned by separate equipment.
THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.
U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 . K)].
VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.
VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, visible transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1.
WHOLE HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air with outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole house ventilation rates.
ZONE. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.
|MAJOR CLIMATE TYPE DEFINITIONS|
|Marine (C) Definition-Locations meeting all four criteria:
|Dry (B) Definition-Locations meeting the following criteria:
Not marine and Pin < 0.44 x (TF- 19.5) [Pcm < 2.0 x (TC + 7) in SI units]where:
Pin = Annual precipitation in inches (cm)
T = Annual mean temperature in °F (°C)
|Moist (A) Definition-Locations that are not marine and not dry.|
|Warm-humid Definition-Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest six consecutive months of the year:
|IP Units||SI Units|
|5A||5400 < HDD65°F ≤ 7200||3000 < HDD18°C ≤ 4000|
|6A||7200 < HDD65°F ≤ 9000||4000 < HDDl 8°C ≤ 5000|
|7||9000 < HDD65°F ≤ 12600||5000 < HDD18°C ≤ 7000|
|Metal with Thermal Break||1.10||0.65||1.90||1.10|
|Nonmetal or Metal Clad||0.95||0.55||1.75||1.05|
|Insulated, nonmetal edge, max 45% glazing, any glazing double pane||0.35|
- Be affixed or attached so it does not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels.
- Be completed by the builder or registered design professional.
- List the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawlspace wall and/or floor) and ducts outside conditioned spaces and U-factors for fenestration. If there is more than 1 value for each component, then the certificate shall list the value covering the largest area.
- List the types and efficiencies of heating, cooling and service water heating equipment.
- If a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, then the certificate shall list "gas-fired unvented room heater," as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces, or electric baseboard heaters.
|5A||0.32||0.55||38||20 or 13 + 5f||13/17||30e||10/13||10, 2 ft||15/19|
|6A||0.32||0.55||49||20 or 13 + 5f||15/20||30e||15/19||10, 4 ft||15/19|
|7||0.32||0.55||49||20 or 13 + 5f||19/21||38e||15/19||10, 4 ft||15/19|
- R-values are minimums. U-factors are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-values specified in the table.
- The fenestration U-factor column excludes skylights.
- "15/19" means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. "15/19" may be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home. "10/13" means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.
- R-5 shall be added to the required slab edge R-values for heated slabs.
- Or insulation sufficient to fill the framing cavity, R-19 minimum.
- First value is cavity insulation, second is continuous insulation or insulated siding, so"13 + 5" means R-13 cavity insulation plus R-5 continuous insulation or insulated siding. If structural sheathing covers 40% or less of the exterior, continuous insulation R-value may be reduced by no more than R-3 in the locations where structural sheathing is used - to maintain a consistent total sheathing thickness.
- The second R-value applies when more than half the insulation is on the interior of the mass wall.
- Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.
- When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.065 in zone 5 and marine 4, and 0.057 in zones 6 and 7.
|Steel Truss Ceilings b|
|R-30||R-38 or R-30 + 3 or R-26 + 5|
|R-38||R-49 or R-38 + 3|
|R-49||R-38 + 5|
|Steel Joist Ceilings b|
|R-30||R-38 in 2 x 4 or 2 x 6 or 2 x 8 R-49 in any framing|
|R-38||R-49 in 2 x 4 or 2 x 6 or 2 x 8 or 2 x 10|
|Steel-Framed Wall, 16" o.c.|
|R-13||R-13 + 4.2 or R-19 + 2.1 or R-21 + 2.8 or
R-0 + 9.3 or R-15 + 3.8 or R-21 + 3.1
|R-13 + 3||R-0 + 11.2 or R-13 + 6.1 or R-15 + 5.7 or
R-19 + 5.0 or R-21 + 4.7
|R-20||R-0 + 14.0 or R-13 + 8.9 or R-15 + 8.5 or
R-19 + 7.8 or R-19 + 6.2 or R-21 + 7.5
|R-20 + 5||R-13 + 12.7 or R-15 + 12.3 or R-19 + 11.6 or
R-21 + 11.3 or R-25 + 10.9
|R-21||R-0 + 14.6 or R-13 + 9.5 or R-15 + 9.1 or
R-19 + 8.4 or R-21 + 8.1 or R-25 + 7.7
|Steel-Framed Wall, 24" o.c.|
|R-13||R-0 + 9.3 or R-13 + 3.0 or R-15 + 2.4|
|R-13 + 3||R-0 + 11.2 or R-13 + 4.9 or R-15 + 4.3 or
R-19 + 3.5 or R-21 + 3.1
|R-20||R-0 + 14.0 or R-13 + 7.7 or R-15 + 7.1 or
R-19 + 6.3 or R-21 + 5.9
|R-20 + 5||R-13 + 11.5 or R-15 + 10.9 or R-19 + 10.1 or
R-21 + 9.7 or R-25 + 9.1
|R-21||R-0 + 14.6 or R-13 + 8.3 or R-15 + 7.7 or
R-19 + 6.9 or R-21 + 6.5 or R-25 + 5.9
|Steel Joist Floor|
|R-13||R-19 in 2 x 6, or R-19 + 6 in 2 x 8 or 2 x 10|
|R-19||R-19 + 6 in 2 x 6, or R-19 + 12 in 2 x 8 or 2 x 10|
- Cavity insulation R-value is listed first, followed by continuous insulation R-value.
- Insulation exceeding the height of the framing shall cover the framing.
|Air barrier and
|A continuous air barrier shall be installed in the building envelope.
Exterior thermal envelope contains a continuous air barrier.
Breaks or joints in the air barrier shall be sealed.
Air-permeable insulation shall not be used as a sealing material.
|Ceiling/attic||The air barrier in any dropped ceiling/soffit shall be aligned with the insulation and any gaps in the air barrier sealed.
Access openings, drop down stair, or knee wall doors to unconditioned attic spaces shall be sealed.
|Walls||Comers and headers shall be insulated and the junction of the foundation and sill plate shall be sealed.
The junction of the top plate and top of exterior walls shall be sealed.
Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier.
Knee walls shall be sealed.
|Windows, skylights and doors||The space between window/door jambs and framing, and skylights and framing shall be sealed.|
|Rim joists||Rim joists shall be insulated and include the air barrier.|
(including above-garage andcantilevered floors)
|Insulation shall be installed to maintain permanent contact with underside of subfloor decking.
The air barrier shall be installed at any exposed edge of insulation.
|Crawl space walls||Where provided in lieu of floor insulation, insulation shall be permanently attached to the crawlspace walls.
Exposed earth in unvented crawl spaces shall be covered with a Class I vapor retarder with overlapping joints taped.
|Shafts, penetrations||Duct shafts, utility penetrations, and flue shafts opening to exterior or unconditioned space shall be sealed.|
|Narrow cavities||Batts in narrow cavities shall be cut to fit, or narrow cavities shall be filled by insulation that on installation readily conforms to the available cavity space.|
|Garage separation||Air sealing shall be provided between the garage and conditioned spaces.|
|Recessed lighting||Recessed light fixtures installed in the building thermal envelope shall be air tight, IC rated, and sealed to the drywall.|
|Plumbing and wiring||Batt insulation shall be cut neatly to fit around wiring and plumbing in exterior walls, or insulation that on installation readily conforms to available space shall extend behind piping and wiring.|
|Shower/tub on exterior wall||Exterior walls adjacent to showers and tubs shall be insulated and the air barrier installed separating them from the showers and tubs.|
|Electrical/phone box on exterior walls||The air barrier shall be installed behind electrical or communication boxes or air-sealed boxes shall be installed.|
|HV AC register boots||HV AC register boots that penetrate building thermal envelope shall be sealed to the subfloor or drywall.|
|Fireplace||An air barrier shall be installed on fireplace walls.|
- In addition, inspection of log walls shall be in accordance with the provisions of ICC-400.
- Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping or other infiltration control measures;
- Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures;
- Interior doors, if installed at the time of the test, shall be open;
- Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed;
- Heating and cooling systems, if installed at the time of the test, shall be turned off; and
- Supply and return registers, if installed at the time of the test, shall be fully open.
- Air-impermeable spray foam products may be applied without additional joint seals.
- Where a duct connection is made that is partially inaccessible, 3 screws or rivets shall be equally spaced on the exposed portion of the joint so as to prevent a hinge effect.
- Continuously welded and locking-type longitudinal joints and seams in ducts operating at static pressures less than 2 inches (51 mm) of water column (500 Pa) pressure classification shall not require additional closure systems.
Duct tightness shall be verified by either of the following:
- Postconstruction test: Total leakage to the outside of a conditioned space or total leakage shall be less than or equal to 4 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inches (2.54 mm) w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test.
- Rough-in test: Total leakage shall be less than or equal to 4 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inches (2.54 mm) w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure. All registers shall be taped or otherwise sealed during the test. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to 3 cfm (85 L/ min) per 100 square feet (9.29 m2) of conditioned floor area.
- Piping larger than 3/4 inch nominal diameter.
- Piping serving more than 1 dwelling unit.
- Piping located outside the conditioned space.
- Piping from the water heater to a distribution manifold.
- Piping located under a floor slab.
- Buried piping.
- Supply and return piping in recirculation systems other than demand recirculation systems.
|Nominal pipe diameter of largest
diameter pipe in the run (inch)
|Maximum run length||30||30||10||5|
- Total length of all piping from the distribution manifold or the recirculation loop to a point of use.
|FAN LOCATION||AIR FLOW RATE MINIMUM
|AIR FLOW RATE MAXIMUM
|Range hoods||Any||2.8 cfm/watt||Any|
|In-line fan||Any||2.8 cfm/watt||Any|
|Bathroom, utility room||10||1.4 cfm/watt||< 90|
|Bathroom, utility room||90||2.8 cfm/watt||Any|
- Where public health standards require 24-hour pump operation.
- Where pumps are required to operate solar-and waste-heat-recovery pool heating systems.
- Address or other identification of the residence;
- An inspection checklist documenting the building component characteristics of the proposed design as listed in Table N1105.5.2(1). The inspection checklist shall show results for both the standard reference design and the proposed design, and shall document all inputs entered by the user necessary to reproduce the results;
- Name of individual completing the compliance report; and
- Name and version of the compliance software tool.
- Documentation of the building component characteristics of the standard reference design.
- A certification signed by the builder providing the building component characteristics of the proposed design as given in Table N1105.5.2(1).
- Documentation of the actual values used in the software calculations for the proposed design.
|BUILDING COMPONENT||STANDARD REFERENCE DESIGN||PROPOSED DESIGN|
|Above-grade walls||Type: mass wall if proposed wall is mass; otherwise wood frame.
Gross area: same as proposed
U-factor : from Table N1102.1.3
Solar absorptance = 0.75
|Basement and crawl
|Type: same as proposed
Gross area: same as proposed
U-factor: from Table N1102.1.3, with insulation layer on interior side of walls.
|Above-grade floors||Type: wood frame
Gross area: same as proposed
U-factor: from Table N1102.1.4
|Ceilings||Type: wood frame
Gross area: same as proposed
U-factor: from Table N1102.1.4
|Roofs||Type: composition shingle on wood sheathing
Gross area: same as proposed
Solar absorptance = 0.75
|Attics||Type: vented with aperture = 1 ft2 per 300 ft2 ceiling area||As proposed|
|Foundations||Type: same as proposed foundation wall area above and below grade and soil.
Characteristics: same as proposed.
|Doors||Area : 40 ft2
U-factor : same as fenestration from Table N1102.1.3.
|Total areab =
Orientation : equally distributed to four cardinal compass orientations(
N, E, S & W).
U-factor: from Table N1102.1.4
SHGC: From Table N1102.1.2 except that for climates with no requirement (NR)
SHGC = 0.40 shall be used.
Interior shade fraction: 0.92-(0.21 x SHGC for the standard reference design)
External shading: none
0.92-(0.21 x SHGC as proposed)
|Air exchange rate||Air leakage rate 4 of air changes per hour at a pressure of 0.2 inchesw.g (50 Pa). The mechanical ventilation rate shall be in addition to theair leakage rate and the same as in the proposed design, but no greaterthan 0.01 x CFA + 7.5 x (Nbr, + 1)
CFA = conditioned floor area
Nbr = number of bedrooms
Energy recovery shall not be assumed for mechanical ventilation.
|The measured air exchange ratee
The mechanical ventilation rated shall be in addition to the air leakage rate and shall be as proposed.
|Internal gains||IGain = 17,900 + 23.8 x CFA + 4104 x Nbr, (Btu/day per dwelling unit)||Same as standard reference design.|
An internal mass for furniture and contents of 8 pounds per square foot of floor area.
|Same as standard reference design, plus any additional mass specifically designed as a thermal storage element' but not integral to the building envelope or structure.|
|Structural mass||For masonry floor slabs, 80% of floor area covered by R-2 carpet and pad, and 20% of floor directly exposed to room air.
For masonry basement walls, as proposed, but with insulation required by Table R402.1.4 located on the interior side of the walls.
For other walls, for ceilings, floors, and interior walls, wood frame construction.
|Heating systems f, g||As proposed for other than electric heating without a heat pump.
Where the proposed design utilizes electric heating without a heat pump the standard reference design shall be an air source heat pump meeting the requirements of the Michigan energy code-commercial provisions.pump the standard reference design shall be an air source heat pump meeting the requirements of the Michigan energy code-commercial provisions.
Capacity: sized in accordance with Section N1103.7.
|Cooling systemsf, h||As proposed
Capacity: sized in accordance with Section N1103.7.
Heatingf• g, h,
Use: same as proposed design
|Thermal distribution systems||Untested distribution systems: DSE = 0.88
Tested Ducts : Leakage rate to outside conditioned space as specified in Section N1103.3.2
Tested duct location: Unconditioned attic
Tested duct insulation: in accordance with Section N1103.3.1.
|Untested distribution systems:
DSE from Table R1105.5.2(2)
Tested ducts: Tested leakage rate to outside conditioned space
Duct location: As proposed
Duct insulation: As proposed
|Thermostat||Type: Manual, cooling temperature setpoint = 75°F;
Heating temperature setpoint = 72°F
|Same as standard reference|
For SI: 1 square foot = 0.93 m2, 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m2, 1 gallon (U.S.) = 3.785 L,
°C = (°F - 32/1.8), 1 degree = 0.79 rad, 1 inch water gauge = 1250 Pa.
- Glazing shall be defined as sunlight-transmitting fenestration, including the area of sash, curbing or other framing elements, that enclose conditioned space. Glazing includes the area of sunlight-transmitting fenestration assemblies in walls bounding conditioned basements. For doors where the sunlight-transmitting opening is less than 50% of the door area, the glazing area is the sunlight transmitting opening area. For all other doors, the glazing area is the rough frame opening area for the door including the door and the frame.
- For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine glazing area:
AF = As x FA x F
AF = Total glazing area.
As = Standard reference design total glazing area.
FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area+ 0.5 x below-grade boundary wall area).
F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater.
Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions.
Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil.
Below-grade boundary wall is any thermal boundary wall in soil contact.
Common wall area is the area of walls shared with an adjoining dwelling unit.
Land CFA are in the same units.
- Where required by the code official, testing shall be conducted by a certified independent third party. Hourly calculations as specified in the ASHRAE Handbook of Fundamentals, or the equivalent shall be used to determine the energy loads resulting from infiltration.
- The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with equation 43 of 2001 ASHRAE Handbook of Fundamentals, page 26.24 and the "whole-house ventilation" provisions of 2001 ASHRAE Handbook of Fundamentals, page 26. I 9 for intermittent mechanical ventilation.
- Thermal storage element shall mean a component not part of the floors, walls, or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as fenestration that faces within 15 degrees (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged.
- For a proposed design with multiple heating, cooling or water heating systems using different fuel types, the applicable standard reference design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for each equipment and fuel type present.
- For a proposed design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for both the standard reference and proposed design.
- For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and the proposed design.
- For a proposed design with a nonstorage-type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed for both the proposed design and standard reference design.
|DISTRIBUTION SYSTEM CONFIGURATION AND CONDITION||FORCED AIR SYSTEMS||HYDRONIC SYSTEMSb|
|Distribution system components located in unconditioned space||-||0.95|
|Untested distribution systems entirely located in conditioned spacec||0.88||1|
For SI: 1 cubic foot per minute = 0.47 L/s, 1 square foot = 0.093 m2, 1 pound per square inch = 6895 Pa, 1 inch water gauge = 1250 Pa.
- Default values given by this table are for untested distribution systems, which must still meet minimum requirements for duct system insulation.
- Hydronic systems shall mean those systems that distribute heating and cooling energy directly to individual spaces using liquids pumped through closed-loop piping and that do not depend on ducted, forced airflow to maintain space temperatures.
- Entire system in conditioned space shall mean that no component of the distribution system, including the air handler unit, is located outside of the conditioned space.
- Ductless systems shall be allowed to have forced airflow across a coil but shall not have any ducted airflow external to the manufacturer's air handler enclosure.
- Computer generation of the standard reference design using only the input for the proposed design. The calculation procedure shall not allow the user to directly modify the building component characteristics of the standard reference design.
- Calculation of whole-building (as a single zone) sizing for the heating and cooling equipment in the standard reference design residence in accordance with Section N1103.6.
- Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.
- Printed building official inspection checklist listing each of the proposed design component characteri stics from Table N1105.5.2(1) determined by the analysis to provide compliance, along with their respective performance ratings (e.g., R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF, etc.).
The proposed residential building shall be shown to have an annual total normalized modified load less than or equal to the annual total loads of the ERI reference design.
|CLIMATE ZONE||ENERGY RATING INDEX|
- Address or other identification of the residential building.
- An inspection checklist documenting the building component characteristics of the rated design. The inspection checklist shall show results for both the ERI reference design and the rated design, and shall document all inputs entered by the user necessary to reproduce the results.
- Name of individual completing the compliance report.
- Name and version of the compliance software tool.
- Documentation of the building component characteristics of the ERI reference design.
- A certification signed by the builder providing the building component characteristics of the rated design.
- Documentation of the actual values used in the software calculations for the rated design.
- Computer generation of the ERI reference design
using only the input for the rated design.
The calculation procedure shall not allow the user to directly modify the building component characteristics of the ERI reference design.
- Calculation of whole-building, as single zone, sizing for the heating and cooling equipment in the ERI reference design residence in accordance with Section N1103.7.
- Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating, and air-conditioning equipment based on climate and equipment sizing.
- Printed code official inspection checklist listing each of the rated design component characteristics determined by the analysis to provide compliance, along with their respective performance ratings.