Ala. Admin. Code 305, ALABAMA ENERGY AND RESIDENTIAL CODES BOARD, ch. 305-2-4, app A
Current through Register Vol. 43, No. 1, October 31, 2024
Appendix A - ALABAMA DEPARTMENT OFECONOMIC AND COMMUNITY AFFAIRS ALABAMA ENERGY AND RESIDENTIAL CODES BOARDTABLE 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.Ala. Admin. Code 305, ALABAMA ENERGY AND RESIDENTIAL CODES BOARD, ch. 305-2-4, app A
New Rule: Filed April 5, 2012; effective May 10, 2012.Author: Karen Clifton
Statutory Authority:Code of Ala. 1975, §§ 41-23-82, as amended.