Alabama Administrative Code › Title 305 - ALABAMA DEPARTMENT OF ECONOMIC AND COMMUNITY AFFAIRS › ALABAMA ENERGY AND RESIDENTIAL CODES BOARD › Chapter 305-2-4 - ORGANIZATION AND AUTHORITY LAW ENFORCEMENT PLANNING DIVISION › Appendix A - ALABAMA DEPARTMENT OFECONOMIC AND COMMUNITY AFFAIRS ALABAMA ENERGY AND RESIDENTIAL CODES BOARD

Current through Register Vol. 42, No. 9, June 28, 2024
TABLE 402.1.1
INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT 
				  a
CLIMATE ZONE
FENES-TRATION
								U-FACTORb
SKYLIGHT
								U-FACTORb
GLAZED FENESTRATION SHGCb, c
CEILING R- VALUE
WOOD FRAME WALL R-VALUE
MASS WALL R-
VALUE1
FLOOR R-VALUE
BASEMENTC WALL
								R-VALUE
SLABd
								  R-
VALUE &
DEPTH
CRAWL SPACE c
WALL R-VALUE
1
1.2
0.75
0 .30
30
13
3/4
13
0
0
0
2
0.65 
								J
0.75
0 .30
30
13
4/6
13
0
0
0
3
0 .50 
								J
0.65
0 .30
30
13
5/8
19
5/13F
0
5/13
4 except Marine
0 .35
0.60
NR
38
13
5/10
19
10/13
10, 2ft
10/13
5 and Marine
4
0.35
0.60
NR
38
20 or 13 + 5h
13/17
30g
10/13
10, 2ft
10/13
6
0.35
0.60
NR
49
20 or 13 + 5h
15/19
30g
15/19
10, 4ft
10/13
7 and 8
0.35
0.60
NR
49
21
19/21
38g
15/19
10, 4ft
10/13
For SI: 1 foot = 3 04.8 mm.
a.
R
-values are minimums.
				[
U
-factors and SHGC are maximums. R-19 batts compressed into a
				nominal 2x6 framing cavity such that the .
R
-value is reduced
				by R-1 or more shall be marked with the compressed batt
				.
R
-value in addition to the full thickness
				.
R
-value.
b. The
				fenestration
U
-factor column excludes skylights. The SHGC
				column applies to all glazed fenestration.
c. "15/19" means R-15 continuous insulated
				sheathing on the interior or exterior of the home or R-19 cavity insulation at
				the interior of the basement wall. "15/19" shall be permitted to be met with
				R-13 cavity insulation on the interior of the basement wall plus R-5 continuous
				insulated sheathing on the interior or exterior of the home. "10/13" means R-10
				continuous insulated sheathing 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 Revalues for heated slabs. Insulation depth shall be the depth of the
				footing or 2 feet, whichever is less in Zones 1 through 3 for heated
				slabs.
e. There are no SHGC
				requirements in the Marine Zone.
f.
				Basement wall insulation is not required in warm-humid locations as defined by
				Figure 301.1 and Table 301.1.
g. Or
				insulation sufficient to fill the framing cavity, R-19 minimum.
h. "13+5" means R-13 cavity insulation plus
				R-5 insulated sheathing. If structural sheathing covers 25 percent or less of
				the exterior, insulating sheathing is not required where structural sheathing
				is used. If structural sheathing covers more than 25 percent of the exterior,
				structural sheathing shall be supplemented with insulated sheathing of at least
				R-2.
i. The second
				.
R
-value applies when more than half the insulation is on the
				interior of the mass wall.
j. For
				impact rated fenestration complying with Section R301.2.1.2 of the
International Residential Code
or Section 1608.1.2 of the
International Building Code
, the maximum
U
-factor shall be 0.75 in Zone 2 and 0.65 in Zone 3.
Author:
Karen Clifton
Statutory Authority:
Code of Ala.
					 1975
, §§
											41-23-82,
					 as amended.