APPENDIX A

TABLE R402.1.2 (N1102.1.2)

INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT ^a

CLIMATE ZONEFENES-TRATIONU-FACTOR^bSKY-LIGHTU-FACTOR^bGLAZED FENEST-RATION SHGC^bCEILINGR-VALUE ^fWOOD FRAME WALLR-VALUEMASSWALLR-VALUE^eFLOOR     R-VALUEBASEMENTWALLR-VALUE ^cSLAB R-VALUE & DEPTHCRAWL SPACE WALLR-VALUE ^c20.35^f 0.55 0.27 30 134/61300030.35^f0.55 0.27 30 135/8 195/13^d05/13

For SI:  1 foot = 304.8 mm.

1. a.  R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which 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-value specified in the table.
2. b.  The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. Exception: Skylights may be excluded from glazed fenestration SHGC requirements in climate zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.
3. c.  “5/13” means R-5 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.
4. d.  Basement wall insulation is not required in warm-humid locations as defined by Figure R301.1 and Table R301.1.
5. e.  The second R-value applies when more than half the insulation is on the interior of the mass wall.

6. f.  Reference R402.2.2.1

   TABLE 40202.1.4

   EQUIVALENT U-FACTORS^a

   Climate ZoneFenestration U-FactorSkylight U-FactorCeiling U-Factor ^cFrame Wall U-FactorMass Wall U-Factor^bFloor U-FactorBasement Wall U-FactorCrawl Space Wall U-Factor20.350.550.0350.0840.1650.0640.3600.47730.350.550.0350.0840.1410.0470.3600.136

7. a.  Non-fenestration U-factors shall be obtained from measurement, calculation, or an approved source.
8. b.  When more than half the insulation is on the interior, the mass wall u-factors shall be a maximum of 0.14 in Zone 2 and 0.12 in Zone 3.

9. c.  Reference R402.2.2.1

   TABLE 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.	As proposed
   Gross area: same as proposed	As proposed
   U-factor: as specified in Table R402.1.4	As proposed
   Solar absorptance = 0.75	As proposed
   Emittance = 0.90	As proposed
   Basement and crawl space walls	Type: same as proposed	As proposed
   Gross area: same as proposed	As proposed
   U-factor: from Table R402.1.4 (as amended), with insulation layer on interior side of walls	As proposed
   Above-grade floors	Type: wood frame	As proposed
   Gross area: same as proposed	As proposed
   U-factor: as specified in Table R402.1.4	As proposed
   Ceilings	Type: wood frame	As proposed
   Gross area: same as proposed	As proposed
   U-factor: as specified in Table R402.1.4	As proposed
   Roofs	Type: composition shingle on wood sheathing	As proposed
   Gross area: same as proposed	As proposed
   Solar absorptance = 0.75	As proposed
   Emittance = 0.90	As proposed
   Attics	Type: vented with aperture = 1 ft2 per 300 ft2 ceiling area	As proposed
   Foundations	Type: same as proposed	As proposed
   Foundation wall area above and below grade and soil characteristics: same as proposed	As proposed
   Opaque doors	Area: 40 ft2	As proposed
   Orientation: North	As proposed
   U-factor: same as fenestration from Table R402.1.4	As proposed
   Vertical fenestration other than opaque doors	Total areag = (a)The proposed glazing area, where the proposed glazing area is less than 15 percent of the conditioned floor area (b)15 percent of the conditioned floor area, where the proposed glazing area is 15 percent or more of the conditioned floor area	As proposed
   Orientation: equally distributed to four cardinal compass orientations (N, E, S & W).	As proposed
   U-factor: as specified in Table R402.1.4	As proposed
   SHGC: as specified in Table R402.1.2 except that for climates with no requirement (NR) SHGC = 0.40 shall be used.	As proposed
   Interior shade fraction: 0.92-(0.21 × SHGC for the standard reference design)	0.92-(0.21 × SHGC as proposed)
   External shading: none	As proposed
   Skylights	None	As proposed
   Thermally isolated sunrooms	None	As proposed

   

   

   

Author: Bret Warren, Heather Goggin

Statutory Authority: Code of Ala. 1975, §§41-23-80 thru 41-23-85, as amended.

History: New Rule: Filed April 5, 2012; effective May 10, 2012. Amended: Filed September 21, 2015; effective October 26, 2015. Repealed and New Rule: Filed August 22, 2016; effective October 6, 2016. Amended: Filed October 17, 2016; effective December 1, 2016. Amended: Filed August 21, 2017; effective October 5, 2017.