15.16.220 Table R402.1.2 Amended – Insulation and Fenestration Requirements by Component.
Table R402.1.2 of the International Energy Conservation Code is hereby amended to read as follows:
TABLE R402.1.2 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa
Climate Zone
Fenestration U-Factor b
Skylight U-Factorb
Glazed Fenestration SHGCb
Ceiling R-Valueg
Wood Frame Wall R-Value
Mass Wall R-Valuef
Floor R-Value
Basement Wall R-Valuec
Slab R-Value & Depthd
Crawl Space Wall R-Valuec
4
0.32
0.55
0.4
49
13
8/13*
19
10/13*
NR
10/13*
For SI: 1 foot = 304.8 mm.
NR = Not Required
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 that the R-value specified in the table.
b.The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.
c.“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 walls.
d.For heated slabs, R-5 insulation shall be provided under the full slab area and shall be added to the slab edge.
e.Or insulation sufficient to fill the framing cavity, R-19 minimum.
f.The second R-value applies when more than half the insulation is on the interior of the mass wall.
g.Loose-fill insulation shall be installed at the rate recommended by the manufacturer’s statement “so many bags per 1,000 sq ft.” Where the pitch of the roof restricts the “minimum thickness” at the exterior wall line, the insulation shall be blown into the cavity so as to achieve a greater compacted density to a point where the “minimum thickness” can be achieved. An alternative is to install high-density batts around the perimeter edge per R402.2.
* Editor’s Note: These numbers have been amended at the request of the City.
(Ord. 19-34 § 11, 2019; Ord. 12-47 § 1, 2012.)