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Michigan Administrative Code (Last Updated: November 16, 2016) |
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Department LR. Licensing and Regulatory Affairs |
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Bureau of Construction Codes |
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Chapter Construction Code - Part 10. Michigan Uniform Energy Code |
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Part 10. MICHIGAN ENERGY CODE |
Section 408.31063. Insulation and fenestration criteria.
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Insulation and fenestration criteria. Table R402.1.1 of the code is amended to read as follows:
TABLE R 402.1.1
INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa
CLIMATE ZONE
FENESTRATION U-FACTOR
SKYLIGHTb U-
FACTOR
CEILING
R-Value
WOOD FRAME WALL R- VALUE
MASS WALL R- VALUEg
FLOOR R- VALUE
BASEMENTc WALL R- VALUE
SLAB d
R- VALUE AND DEPTH
CRAWL SPACEc WALL R- VALUE
5A
0.32
0.55
38
20 or
13 + 5f
13/17
30e
10/13
10, 2ft
15/19
6A
0.32
0.55
49
20 or 13 +
5f
15/20
30e
15/19
10, 4ft
15/19
7
0.32
0.55
49
20 or 13 +
5f
19/21
38e
15/19
10, 4ft
15/19
a. R-values are minimums. U-factors are maximums. When insulation is installed in a cavity that 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.
b. The fenestration U-factor column excludes skylights.
c. “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.
d. R-5 shall be added to the required slab edge R-values for heated slabs.
e. Or insulation sufficient to fill the framing cavity, R-19 minimum.
f. 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.
g. The second R-value applies when more than half the insulation is on the interior of the mass wall.
History: 1998-2000 AACS; 2008 AACS; 2010 AACS; 2015 AACS.