2015 MICHIGAN UNIFORM ENERGY CODE Effective: February 8, 2016

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1 CHEBOYGAN COUNTY DEPARTMENT OF BUILDING SAFETY 870 South Main Street P.O. Box 70 Cheboygan, Michigan Phone: (231) Fax: (231) MICHIGAN UNIFORM ENERGY CODE Effective: February 8, 2016 N (R101.3) Intent. The energy code regulates the design and construction of buildings for the effective use and conservation of energy over the life of the building. N (R ) Additions, alterations, renovations, or repairs. Additions, alterations, renovations or repairs to an existing building, building system, or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portion of the building to conform to this code. Exceptions: storm windows, glass replacement in existing sashes, unexposed roof, wall and floor cavities, reroofing where the sheathing and insulation are not exposed, etc N (R ) Change in space conditioning. Any non-conditioned space that is altered to be conditioned space is required to become fully compliant with this code. N (R103.2) Construction documents. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed. Details shall include insulation materials and their R values and fenestration U factors. N (R ) Building thermal envelope insulation. An R-value identification mark shall be applied to each piece of the building thermal envelope. Alternately, the installation installer shall provide a certificate listing the type, manufacturer and R-value of the insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness and the R-value shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site. N (R ) Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches on markers that are installed at least one for every 300 square feet throughout the attic space. Each

2 marker shall face the attic opening. Spray polyurethane foam thickness and installed R-value shall be listed on the certification provided by the insulation installer. N (R ) Insulation mark installation. Insulation materials shall be installed such that the manufacturer s R-value mark is readily observable upon inspection. N (R401.3) Mandatory certificate. A permanent certificate shall be posted on or in the electrical distribution panel and shall meet and include the following information: be completed by the builder or registered design professional, list the predominant R-values 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, list the types and efficiencies of heating, cooling and water heating equipment. N (R ) Insulation and fenestration criteria. The building thermal envelope shall meet the requirements of table R Climate Zone Fenestration U- Factor Table N (R )-Insulation And Fenestration Requirements By Component a Wood Slab D Skylight b Ceiling R- Frame Mass Wall Floor R- Basement c R- Value U-Factor Value Wall R- R- Value g Value Wall And Value R-Value Depth Crawl Space c Wall R- Value 5A A or f 13/17 30 e 10/13 10, 2ft 15/19 20 or f 15/20 30 e 15/19 10, 4ft 15/19 20 or f 19/21 38 e 15/19 10, 4ft 15/19 N (R ) Ceilings with attic spaces. R38 shall be deemed to satisfy the requirement for R49 wherever the full height of uncompressed R38 insulation extends over the wall top plate at the eaves. N (R ) Ceilings without attic spaces. Where table R would require insulation levels above R30 and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation for such assemblies shall be R30. This reduction is limited to 500 square feet or 20% of the total insulated ceiling area, whichever is less. N (R ) Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces shall be weather-stripped and insulated to a level equivalent to the insulation on the surrounding surfaces.

3 N (R ) Basement walls. Walls associated with conditioned basements shall be insulated from the top of the wall down 10-0 below grade or to the basement floor whichever is less. Unconditioned basements shall meet this requirement unless the floor is insulated in accordance with table R N (R402.2) Thermally isolated sunroom insulation. The minimum ceiling insulation shall be R24 and the minimum wall insulation shall be R13. N (R ) Replacement fenestration. Where some or all of an existing fenestration unit is replaced with a new fenestration unit, including sash and glazing, the replacement fenestration unit shall meet the requirements for U factors in table R and R N (R402.4) Air leakage. The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections R through R N (R ) Building thermal envelope. The building thermal envelope shall comply with Sections R and R Air barrier and thermal barrier Ceiling/attic Walls Windows, skylights and doors Rim joists Floors TABLE N (R ) AIR BARRIER AND INSULATION INSTALLATION COMPONENT CRITERIA a A continuous air barrier shall be installed in the building envelope. Exterior thermal envelope contains a continuous air barrier. Breaks of joints in the air barrier shall be sealed. Air-permeable insulation shall not be used as a sealing material. 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. Corners 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. The space between window/door jambs and framing and skylights and framing shall be sealed. Rim joists shall be insulated and include the air barrier. Insulation shall be installed to maintain permanent

4 (including above-garage, and cantilevered floors) contact with underside of subfloor decking. The air barrier shall be installed at any exposed edge of insulation. Crawl space walls Where provide 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 walls Exterior walls adjacent to showers and tubs shall be insulated and the air barrier installed separating them from the showers and tubs. Exterior/phone box on exterior walls The air barrier shall be installed behind electrical or communication boxes or air-sealed boxes shall be installed. HVAC register boots HVAC 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. a. In addition, inspection of log walls shall be in accordance with the provisions of ICC-400. N (R ) Testing (prescriptive). The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding 4 air changes per hour. Testing shall be conducted with a blower door at a pressure of 0.2 inches (5.08 mm) w.g. (50 pascals). Where required by the code official, testing shall be conducted by a certified independent third party. Certification programs shall be approved by the state construction code commission. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. All of the following apply during testing: 1. Exterior windows, doors, and fireplace and stove doors shall be closed, but not sealed, beyond the intended weather-stripping or other infiltration control measures.

5 2. Dampers including exhaust, intake, makeup air, backdraft, and flue dampers shall be closed, but not sealed beyond intended infiltration control measures. 3. Interior doors, installed at the time of the test, shall be open. 4. Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed. 5. Heating and cooling systems, if installed at the time of the test, shall be turned off. 6. Supply and return registers, if installed at the time of the test, shall be fully open. N (R ) Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering. N (R ) Sealing (mandatory). Ducts, air handlers, and filter boxes shall be sealed. Duct tightness shall be verified by either of the following: 1. Post construction 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 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. 2. 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 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. Exception: The total leakage test is not required for ducts and air handlers located entirely within the building thermal envelope. N (R403.5) Mechanical ventilation. The building shall be provided with ventilation that meets the requirements of section M1501 or the International Mechanical Code. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating understanding air. N (R405.3) Performance-based compliance. Compliance based on simulated energy performance. Note: Michigan will not be developing a Michigan specific REScheck software for the 2015 MRC. The Cheboygan County Department of Building Safety will accept a passing report from REScheck based upon the 2015 International Energy Conservation Code.

6 (N1106) Energy Rating Index Compliance Alternative. The Cheboygan Department of Building Safety will accept a third-party evaluation and report accurately satisfying all criteria of the codes ERI requirements.