15 CORRECTION OF OBVIOUS ERRORS IN PUBLICATION

 

ORR # 2003-015

 

Department of Labor and Economic Growth Construction Code

January 24, 2005

 

Mr. Brian Devlin, Director

DMB, Office of Regulatory Reform 2nd Floor; Mason Building Lansing, MI  48933

 

Dear Brian:

 

Staff has detected errors in the following rules, as indicated in bold print below.  This rule set becomes effective on February 28, 2005.

 

MICHIGAN UNIFORM ENERGY CODE

 

R 408.31070  Heating energy analysis comparison report.

Rule 1070.  Sections N1107.1, N1107.1.1, N1107.2, abbreviated report form N1107.1, and table N1107.1 are added to the code to read as follows:

N1107.1  Heating energy analysis comparison report.  A heating energy comparison report shall be submitted to the code official to include both of the following information:

1.    A basic description of the proposed alternate building design and any exceptions to the standard design criteria.

2.    Abbreviated report form N1107.1, comparing the alternative house design with a standard design house complying with the provisions of this chapter through the systems analysis method.

Abbreviated Report Form N1107.1 Heating Energy Analysis Comparison Report

 

 

PROPOSED ALTERNATIVE HOUSE                                                                           STANDARD DESIGN HOUSE

ROOF/CEILING (INC. SKYLIGHTS)                       SUBTOTALS                        ROOF/CEILING (INC. SKYLIGHTS)                                                                                 SUBTOTALS

A1                

/R1                   

=  A1 /R1                  

 

A2                

/R2                   

=  A2 /R2                  

 

A3                

/R3                   

=  A3 /R3                  

 

 

Total Roof/Ceiling Area

A1 /R1 + A2 /R2 + A3 /R =                         

Line 1

x      0.0204 =

Total Roof/Ceiling Area                             (all zones)

Line A

 

GROSS WALL                                                                                                       GROSS WALL

 

 

Opaque Wall (Does not include band joist, windows, doors, etc.)

 

A1                

/R1                   

=  A 1 /R1                  

 

A2                

/R2                   

=  A 2 /R2                  

A1 /R1 + A 2 /R2 =

 

Line 2

 

Band Joist

 

A           /R               

=  A /R             =

 

Line 3

 

Fenestration and Doors, Windows

 

A1                

/R1                   

=  A1 /R1                  

 

A2                

/R2                   

=  A2 /R2                  

 

A3                

/R3                   

=  A3 /R3                  

A1 /R1 + A2 /R2 + A3 /R3 =                        

Line 4

 

Doors

 

A1                

/R1                   

=  A1 /R1                  

 

A2                

/R2                   

=  A2 /R2                  

A1 /R1 + A2 /R2 =

 

 

Line 5

 

Other

 

A           /R               

=  A/R                 =

 

Total Gross Wall Area

Line 6

 

GROSS WALL SUBTOTAL A/R (Lines: 2+3+4+5+6)

x      0.093 =                                

Line 7

Total Gross Wall Area                           (all zones)

Line B

Abbreviated Report Form N1107.1

 

 

Heating Energy Analysis Comparison Report

Continued

 

FOUNDATION/FLOOR                             SUBTOTAL S

FOUNDATION/FLOOR                       SUBTOTALS

 

Floors Over Unconditioned Spaces

Floors Over Unconditioned Spaces

 

 

A                     /R                

=   A/R                  =                                      

                                                        x       0.0204  =                              

Line 8

Total Floor Area                                            (all

zones)

Line C

 

Slab on Grade Floors (Area = Perimeter x 2')

Slab on Grade (Unheated)

 

Z10.0909                                 

=   A/R                 =                        

Line 9

                                                        x       Z20.0769 =

Total Slab Edge Area

Line D

 

 

				Z30.050   Slab on Grade (Heated) Z10.0769                                                         x                                                      Z20.0667 = Total Slab Edge Area Z30.050		Line E
	Crawl Space Walls (Area:  Top foundation wall to average finished grade)     A                 /R                    =   A/R                      =	Line 10		Crawl Space                                                             x       0.050 = Total Crawl Space Wall Area                                                                       (all zones)		Line F
	Basement Walls (Area:  Top foundation wall to average finished grade)   A1                         /R1                              =   A1 /R1                                  A2                         /R2                              =   A2 /R2                                A1 /R1 + A2 /R2 =   Basement Windows   A                 /R                    =   A/R                     =	Line 11                          Line 12		Basement Walls	Z10.090 x	Line G
				Z20.090 = Total Gross Basement Wall Area Z30.055
	Total Gross Basement Wall Area
	FOUNDATION/FLOOR SUBTOTAL A/R (Lines:  8+9+10+11+12)	Line 13		FOUNDATION/FLOOR SUBTOTAL A/R (Lines:  C+D+E+F+G)		Line H
	PROPOSED ALTERNATIVE HOUSE SUB-TOTAL A/R (Lines:  1+7+13)	Line 14		STANDARD DESIGN HOUSE SUB-TOTAL A/R (Lines:  A+B+H)		Line I
	HEATING EQUIPMENT EFFICIENCY (If the same as Standard House, go to line 16 or 17) (Oil or Gas Fired) AFUE:      % Line 14:              =   Adjusted A/R = AFUE: 0.	Line 15		HEATING EQUIPMENT EFFICIENCY     (Oil or Gas Fired)              AFUE: 78%   Line I:                 =   Adjusted A/R = AFUE: 0.78		Line J
	AIR LEAKAGE RATE (If the same as Standard House, go to line 17)                                         ACH x                                      ft3 x 0.018 = Air Changes per Hour                          Volume of House	Line 16		AIR LEAKAGE RATE     0.55 ACH x ft3 x 0.018 = Volume of House		Line K
	PROPOSED ALTERNATIVE HOUSE TOTAL (Lines: 15+16)			STANDARD DESIGN LIMIT TOTAL (Lines:  J+K)

 

 

 

Equal to or less than line L to pass

Line 17

(Lines:  J+K)

Line L

 

Action and rationale:  Under Foundation Floors; Floors Over Unconditioned Spaces multiplier 0.0204 should be 0.0476.  Using the multiplier as printed will create an incorrect result when calculating for the proper R-value of insulation to be used for the construction to comply with the intent of the code. The version of the energy code that went to public hearing had the correct multiplier.

 

 

 

Table N1107.1

Alternative Standard Design Constants (1/r) for Systems Analysis Approach

Heating Degree Days	6000 –	6500 –	7000 –	7500 –	8000 –	8500 –	9000 +
	6499	6999	7499	7999	8499	8999
Roof/Ceiling	0.0204	0.0204	0.0204	0.0204	0.0204	0.0204	0.0204
Gross Wall	0.093	0.093	0.093	0.093	0.093	0.093	0.093
Foundation/floor Floor over unconditioned space	0.0204	0.0204	0.0204	0.0204	0.0204	0.0204	0.0204
Slab on grade Unheated slab	0.0909	0.0909	0.0769	0.0769	0.0769	0.050	0.050
Heated Slab	0.0769	0.0769	0.0667	0.0677	0.0667	0.050	0.050
Crawl space	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Basement wall	0.0909	0.0909	0.0909	0.0909	0.0909	0.0555	0.0555

 

Action and rationale:  Under Foundation Floors; Floors Over Unconditioned Spaces multiplier 0.0204 should be 0.0476.  This needs to match the multiplier found in the Abbreviated Report Form N1107.1 to achieve proper calculation of R values for insulation. As printed, the multiplier calls for a higher R value than necessary resulting in the use of more insulation and a higher building cost.  Correcting the figure in both the Abbreviated Report form and table will result in a more realistic use of insulating materials and reduce the up front building costs.

 

(Michigan Residential Code)

TABLE N1102.1

SIMPLIFIED PRESCRIPTIVE BUILDING ENVELOPE THERMAL COMPONENT CRITERIA MINIMUM REQUIRED THERMAL PERFORMANCE (U-FACTOR AND R-VALUE)

Exterior Enclosure

Zones

1                              2                           3

Wall Assemblies                                                                                                   R-21                       R-21                     R-21

Fenestration/Openings (area weighted average of the total area of fenestration units)1,

U =0.35 (R= 2.85)

Roof/Ceiling Assemblies2                                                                                                                             R-49                       R-49                     R-49

Floors over unconditioned spaces                                                                    R-21                       R-21                     R-21

Slab on grade construction3

 

 

 

R-11, 4 ft.               R-13, 4ft              R-18, 4ft

 

Crawl space walls4                                                                                                                                               R-20                       R-20                     R-20 Continuous Insulation                              R-10                       R-10

 

 

Basement walls

R-15

BUILDING LOCATION		MAXIMUM GLAZINGGLA ZING U- FACTOR [Btu / . ° (hr .ft2   F)]	. ° MINIMUM INSULATION R-VALUE [(hr .ft2   F) / Btu]
Climate Zone	HDD		Ceilings	Walls	Floors	Basement walls	Slab perimeter R- value and depth /	Crawl space walls
1	0-499	Any	R-13	R-11	R-11	R-0	R-0	R-0
2	500-999	0.90	R-19	R-11	R-11	R-0	R-0	R-4
3	1,000- 1,499	0.75	R-19	R-11	R-11	R-0	R-0	R-5
4	1,500- 1,999	0.75	R-26	R-13	R-11	R-5	R-0	R-5
5	2,000- 2,499	0.65	R-30	R-13	R-11	R-5	R-0	R-6
6	2,500- 2,999	0.60	R-30	R-13	R-19	R-6	R-4, 2 ft.	R-7
7	3,000- 3,499	0.55	R-30	R-13	R-19	R-7	R-4, 2 ft.	R-8
8	3,500- 3,999	0.50	R-30	R-13	R-19	R-8	R-5, 2 ft.	R-10
9	4,000- 4,499	0.45	R-38	R-13	R-19	R-8	R-5, 2 ft.	R-11
10	4,500- 4,999	0.45	R-38	R-16	R-19	R-9	R-6, 2 ft.	R-17
11	5,000- 5,499	0.45	R-38	R-18	R-19	R-9	R-6, 2 ft.	R-17
12	5,500- 5,999	0.40	R-38	R-18	R-21	R-10	R-9, 4 ft.	R-19
13	6,000- 6,499	0.35	R-38	R-18	R-21	R-10	R-9, 4 ft.	R-20
14	6,500- 6,999	0.35	R-49	R-21	R-21	R-11	R-11, 4 ft.	R-20
15	7,000- 8,499	0.35	R-49	R-21	R-21	R-11	R-13, 4 ft.	R-20
16	8,500- 8,999	0.35	R-49	R-21	R-21	R-18	R-14, 4 ft.	R-20
17	9,000- 12,999	0.35	R-49	R-21	R-21	R-19	R-18, 4 ft.	R-20

 

 

 

 

		Cavity Insulation	R-11	R-11	R-19
1 Fenestration units are required to meet this standard for the entire unit. 2 Skylight U (1/R) factors are required to meet the fenestration requirements set forth in this table for fenestration/openings. Skylights are limited to 10% of the gross roof/ceiling area. 3 See section N1102.1.6 for additional installation criteria. 4 See section N1102.1.7 for additional installation criteria.   Action & Rationale: Upon adoption of the International Residential Code, this table was amended for use in Michigan.  The original version of Table N1102.1 found in the International Residential Code includes the distance designation.  When the table was amended for the Michigan code the distance designation of 4 ft was inadvertently left out of the table. The distance of 4 ft needs to be added to the “zone” information for ‘slab on grade construction’ to correspond to the installation criteria in the related section N1102.1.6. Without this distance information it will be difficult for contractors and builders to comply with the intent of the code. (International Residential Code Table)   TABLE N1102.1 SIMPLIFIED PRESCRIPTIVE BUILDING ENVELOPE THERMAL COMPONENT CRITERIA MINIMUM REQUIRED THERMAL PERFORMANCE (U-FACTOR AND R-VALUE)

 

 

Michigan Administrative Code.

 

If you have any questions about this transmittal, please contact me at 241-4580. Sincerely,

 

Norene Lind, Regulatory Affairs Officer MDLEG, Office of Policy and Legislative Affairs