Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Bureau of Construction Codes › Construction Code Commission General Rules › Construction Code › Part 5 - RESIDENTIAL CODE › Section R. 408.30547e - Simulated performance alternative

Current through Vol. 24-12, July 15, 2024
Rule 547e.
Table N1105.5.2(1) [R405.5.2(1)] of the code is amended
						to read as follows:
TABLE N1105.5.2(1) [R405.5.2(1)]
SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED
						DESIGNS
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
Remittance = 0.90
As proposed
As proposed
As proposed
As proposed
As proposed
Basement and crawl space walls
Type: same as proposed
Gross area: same as proposed
U-factor: from Table N1102.1.3, with insulation
									 layer on interior side of walls.
As proposed
As proposed
As proposed
Above-grade floors
Type: wood frame
Gross area: same as proposed
U-factor: from Table N1102.1.4
As proposed
As proposed
As proposed
Ceilings
Type: wood frame
Gross area: same as proposed
U-factor: from Table N1102.1.4
As proposed
As proposed
As proposed
Roofs
Type: composition shingle on wood
									 sheathing
Gross area: same as proposed
Solar absorptance = 0.75
Emittance = 0.90
As proposed
As proposed
As proposed
As proposed
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
As proposed
As proposed
Doors
Area: 40 ft2
Orientation: North
U-factor: same as fenestration from Table
									 N1102.1.3.
As proposed
As proposed
As proposed
Glazing
Totalb =
(a) The proposed glazing area: where proposed
									 glazing area is less than 15% of the conditioned floor area.
(b) 15% of the conditioned floor area; where
									 the proposed glazing area is 15% or more of the conditioned floor area.
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
As proposed
As proposed
As proposed
As proposed 0.92-(0.21 x SHGC as
									 proposed)
As proposed
Skylights
None
As proposed
Thermally isolated sunrooms
None
As proposed
Air exchange rate
Air leakage rate of 4 air changes per hour at a
									 pressure of 0.2 inches w.g. (50 Pa). The mechanical ventilation rate shall be
									 in addition to the air leakage rate and the same as in the proposed design, but
									 no greater than 0.01 x CFA + 7.5 x (Nbr + 1) where:
CFA = conditioned floor area
Nbr = number of bedrooms
Energy recovery shall not be assumed for
									 mechanical ventilation.
The measured air exchange
									 ratec. 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.
Internal mass
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
									 elementc 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.
As proposed
As proposed
As proposed
Heating
									 systemsf,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. Capacity: sized in accordance with Section N1103.7.
As proposed
Cooling
									 systemsf,h
As proposed
Capacity: sized in accordance with Section
									 N1103.7.
As proposed
Service water
									 heatingf,g,h,i
As proposed
Use: same as proposed design
As proposed
Thermal distribution systems
Untested distribution systems: DSE =
									 0.88
Tested ducts: Leakage rate to outside
									 conditioned space as specified 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
									 N1105.5.2(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-3)/1.8, 1 degree = 0.79 rad, 1 inch water
						gauge = 1250 Pa.
a. 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.
b. 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
where:
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.
and where:
Thermal boundary wall is any wall that separates
						conditioned space from unconditioned 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.
L and CFA are in the same units.
c. 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.
d. 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 26.19 for intermittent mechanical ventilation.
e. 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.
f.
					 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.
g. 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.
h.
					 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.
i. For a proposed design with a
					 non-storage-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.