ASHRAE-90.1-2022- - Page 058
Extracted Content
Table 5.5-8 Building Envelope Requirements for Climate Zone 8*
Nonresidential Residential Semiheated
Insulation Min. R-Value
Assembly Maximum
Insulation Min. R-Value
Assembly Maximum
Insulation Min. R-Value
Opaque Elements
Roofs
Insulation entirely
above deck
Assembly Maximum
U-0.028 R-35 c.i. U-0.028 R-35 c.i. U-0.039 R-25 c.i.
Metal building [ a] U-0.026 R-25 + R-11+R-11 Ls U-0.026 R-25 + R-11+R-11 Ls U-0.037 R-19+R-11 Ls or
R-25 + R-8 Ls
Attic and other U-0.017 R-60 U-0.017 R-60 U-0.027 R-38
Walls, above Grade
Mass U-0.048 R-19 c.i. U-0.048 R-19 c.i. U-0.104 R-9.5 c.i.
Metal building U-0.039 R-0 + R-25 c.i. U-0.039 R-0 + R-25 c.i. U-0.060 R-0 + R-15.8 c.i.
Steel-framed U-0.037 R-13 + R-18.8 c.i. U-0.037 R-13 + R-18.8 c.i. U-0.064 R-13 + R-7.5 c.i.
Wood-framed and other U-0.032 R-13 + R-18.8 c.i. U-0.032 R-13 + R-18.8 c.i. U-0.051 R-13 + R-7.5 c.i.
Wall, below Grade
Below-grade wall C-0.063 R-15 c.i. C-0.063 R-15 c.i. C-0.119 R-7.5 c.i.
Floors
Mass U-0.038 R-23 c.i. U-0.038 R-23 c.i. U-0.064 R-12.5 c.i.
Steel joist U-0.032 R-38 U-0.032 R-38 U-0.052 R-19
Wood-framed and other U-0.027 R-38 U-0.027 R-38 U-0.033 R-30
Slab-on-Grade Floors
Unheated F-0.434 R-20 for 48 in. F-0.424 R-25 for 48 in. F-0.540 R-10 for 24 in.
Heated F-0.671 R-25 for 48 in. F-0.373 R-20 full slab F-0.860 R-15 for 24 in.
Opaque Doors
Swinging U-0.370 U-0.370 U-0.370
Nonswinging U-0.310 U-0.310 U-0.310
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 0.26 0.40 1.10 (for all
0.26 0.40 1.10 (for all
types)
0.36 NR (for all
types)
NR (for all
Operable 0.32 0.36 types) 0.32 0.36 types) 0.44 types) types)
types)
Entrance door 0.63 0.36 0.63 0.36 0.63
Skylight, 0% to 3% of Roof
All types 0.41 NR NR 0.41 NR NR 0.75 NR NR
- The following definitions apply: c.i. = continuous insulation (see Section 3.2), FC = filled cavity (see Section A2.3.2.5), Ls = liner system (see Section A2.3.2.4); 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).
56 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)