ASHRAE-90.1-2022- - Page 053
Extracted Content
Table 5.5-3 Building Envelope Requirements for Climate Zone 3 (A,B,C)*
Nonresidential Residential Semiheated
Insulation Min. R-Value
Assembly Maximum
Roofs
Insulation Min. R-Value
Assembly Maximum
Insulation Min. R-Value
Opaque Elements
Insulation entirely
above deck
Assembly Maximum
U-0.039 R-25 c.i. U-0.039 R-25 c.i. U-0.119 R-7.6 c.i.
Metal building [ a] U-0.041 R-10 + R-19 FC U-0.041 R-10 + R-19 FC U-0.096 R-16
Attic and other U-0.027 R-38 U-0.027 R-38 U-0.053 R-19
Walls, above Grade
Mass U-0.123 R-7.6 c.i. U-0.104 R-9.5 c.i. U-0.580 NR
Metal building U-0.094 R-0 + R-9.8 c.i. U-0.072 R-0 + R-13 c.i. U-0.162 R-13
Steel-framed U-0.077 R-13 + R-5 c.i. U-0.064 R-13 + R-7.5 c.i. U-0.124 R-13
Wood-framed and other U-0.089 R-13 U-0.064 R-13 + R-3.8 c.i. or R-20 U-0.089 R-13
Wall, below Grade
Below-grade wall C-1.140 NR C-1.140 NR C-1.140 NR
Floors
Mass U-0.074 R-10 c.i. U-0.074 R-10 c.i. U-0.137 R-4.2 c.i.
Steel joist U-0.038 R-30 U-0.038 R-30 U-0.052 R-19
Wood-framed and other U-0.033 R-30 U-0.033 R-30 U-0.051 R-19
Slab-on-Grade Floors
Unheated F-0.730 NR F-0.540 R-10 for 24 in. F-0.730 NR
Heated F-0.860 R-15 for 24 in. F-0.860 R-15 for 24 in. F-1.020 R-7.5 for 12 in.
Opaque Doors
Swinging U-0.370 U-0.370 U-0.370
Nonswinging U-0.310 U-0.310 U-0.360
Assembly
Max. U
Assembly
Max. U
Assembly
Min. VT/SHGC
Assembly Max. SHGC
Assembly
Min. VT/SHGC
Assembly Max. SHGC
Assembly
Min. VT/SHGC
Assembly
Max. SHGC
Fenestration
Assembly
Max. U
Vertical Fenestration, 0% to 40% of Wall
Fixed 0.42 0.25 1.10 (for all
0.42 0.25 1.10 (for all
types)
0.50 NR (for all
types)
NR (for all
Operable 0.54 0.23 types) 0.54 0.23 types) 0.65 types) types)
types)
Entrance door 0.68 0.23 0.68 0.23 0.77
Skylight, 0% to 3% of Roof
All types 0.55 0.30 NR 0.55 0.30 NR 0.90 NR NR
- The following definitions apply: c.i. = continuous insulation (see Section 3.2), FC = filled cavity (see Section A2.3.2.5), NR = no (insulation) requirement. a. When using the R-value compliance method for metal building roofs, a thermal spacer block is required (see Section A2.3.2).
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 51