CHAPTER 5 BUILDING ENVELOPE REQUIREMENTS

TABLE 5.1 Building Envelope Requirements for Climate Zone 1 SI

Nonresidential Residential Semiconditioned
Assembly Insulation Assembly Insulation Assembly Insulation
Opaque Elements Max U-Value Min R-Value Max U-Value Min R-Value Max U-Value Min R-Value
W/m2·°C m2·°C/W W/m2·°C m2·°C/W W/m2·°C m2·°C/W
Roofs
Insulation Entirely above Deck U-0.357 R-2.66 c.i U-0.272 R-3.54 c.i U-1.250 R-0.67 c.i
Metal Buildings U-0.369 R-2.57 c.i. U-0.369 R-2.57 c.i. U-0.950 R-0.92 c.i
Attic with Steel Joists U-0.193 R-6.91 U-0.153 R-9.70 U-0.460 R-2.27
Walls, Above-Grade
Mass U-1.191 R-0.60 c.i. U-0.312 R-2.96 c.i. U-1.191 R-0.60 c.i.
Metal Building U-0.193 R-5.04 c.i. U-0.193 R-5.04 c.i. U-0.233 R-4.14 c.i.
Steel-Framed U-0.255 R-3.42 c.i. U-0.255 R-3.42 c.i. U-0.738 R-0.86 c.i.
Walls, Below-Grade
Below-Grade Wall C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i.
Floors
Mass U-0.397 R-1.97 c.i. U-0.397 R-1.97 c.i. U-0.397 R-1.97 c.i.
Steel-Joist U-0.408 R-1.94 c.i. U-0.408 R-1.94 c.i. U-0.408 R-1.94 c.i.
Slab-On-Grade Floors
Unconditioned F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i.
Opaque Doors
Swinging U-2.84 U-2.84 U-2.84
Nonswinging U-5.9 U-5.90 U-5.90
Assembly Assembly Max. Assembly Assembly Max. Assembly Assembly Max.
Fenestration Max U-Value SHGC Max U-Value SHGC Max U-Value SHGC
W/m2·°C W/m2·°C W/m2·°C
Vertical Glazing, 0% to 40% of Wall
Nonmetal framing (all) U-2.89 U-2.89 U-2.89
Metal framing U-2.89 U-2.89 U-2.89
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing U-2.89 U-2.89 U-2.89
Metal framing (all other) U-2.89 U-2.89 U-2.89
Vertical Glazing, >40% to 50% of Wall
Nonmetal framing (all) U-2.38 U-2.38 U-2.38
Metal framing U-2.38 U-2.38 U-2.38
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing U-2.38 U-2.38 U-2.38
Metal framing (all other) U-2.38 U-2.38 U-2.38
Vertical Glazing, >50% to 100% of Wall
Nonmetal framing U-1.87 U-1.87 U-1.87
Metal framing U-1.87 U-1.87 U-1.87
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-1.87 U-1.87 U-1.87
Metal framing (all other) U-1.87 U-1.87 U-1.87
Skylight with Curb, Glass, % of Roof
0%–2.0% U-11.23 0.36 U-11.23 0.19 U-11.23
NR
2.1%–5.0% U-11.23 0.19 U-11.23 0.16 U-11.23
Skylight with Curb, Plastic, % of Roof
0%–2.0% U-10.78 0.34 U-10.78 0.27 U-10.78
NR
2.1%–5.0% U-10.78 0.27 U-10.78 0.27 U-10.78
Skylight without Curb, All, % of Roof
0%–2.0% U-7.72 0.36 U-7.72 0.19 U-7.72
NR
2.1%–5.0% U-7.72 0.19 U-7.72 0.19 U-7.72
c.i. = continuous insulation
f.i. = fully insulated

SBC 601-CR-18 18
CHAPTER 5 BUILDING ENVELOPE REQUIREMENTS

TABLE 5.1 Building Envelope Requirements for Climate Zone 2 SI

Nonresidential Residential Semiconditioned
Assembly Insulation Assembly Insulation Assembly Insulation
Opaque Elements Max U-Value Min R-Value Max U-Value Min R-Value Max U-Value Min R-Value
W/m2·°C m2·°C/W W/m2·°C m2·°C/W W/m2·°C m2·°C/W
Roofs
Insulation Entirely above Deck U-0.454 R-2.06 c.i. U-0.34 R-2.80 c.i. U-1.590 R-0.49 c.i.
Metal Buildings U-0.471 R-1.99 c.i. U-0.47 R-1.99 c.i. U-1.135 R-0.74 c.i.
Attic with Steel Joists U-0.244 R-5.00 U-0.19 R-6.91 U-0.579 R-1.73
Walls, Above-Grade
Mass U-1.362 R-0.49 c.i. U-0.352 R-2.61 c.i. U-1.362 R-0.49 c.i.
Metal Building U-0.216 R-4.49 c.i. U-0.216 R-4.49 c.i. U-0.267 R-3.59 c.i.
Steel-Framed U-0.284 R-3.03 c.i. U-0.284 R-3.03 c.i. U-0.851 R-0.67 c.i.
Walls, Below-Grade
Below-Grade Wall C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i.
Floors
Mass U-0.567 R-1.22 c.i. U-0.567 R-1.22 c.i. U-0.567 R-1.22 c.i.
Steel-Joist U-0.624 R-1.09 c.i. U-0.624 R-1.09 c.i. U-0.624 R-1.09 c.i.
Slab-On-Grade Floors
Unconditioned F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i.
Opaque Doors
Swinging U-2.84 U-2.84 U-2.84
Nonswinging U-5.90 U-5.90 U-5.90

Assembly Assembly Max. Assembly Assembly Max. Assembly Assembly Max.

Fenestration Max U-Value SHGC Max U-Value SHGC Max U-Value SHGC
W/m2·°C W/m2·°C W/m2·°C
Vertical Glazing, 0% to 40% of Wall
Nonmetal framing (all) U-2.89 U-2.89 U-2.89
Metal framing U-2.89 U-2.89 U-2.89
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-2.89 U-2.89 U-2.89
Metal framing (all other) U-2.89 U-2.89 U-2.89
Vertical Glazing, >40% to 50% of Wall
Nonmetal framing (all) U-2.38 U-2.38 U-2.38
Metal framing U-2.38 U-2.38 U-2.38
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-2.38 U-2.38 U-2.38
Metal framing (all other) U-2.38 U-2.38 U-2.38
Vertical Glazing, >50% to 100% of Wall
Nonmetal framing (all) U-1.87 U-1.87 U-1.87
Metal framing U-1.87 U-1.87 U-1.87
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-1.87 U-1.87 U-1.87
Metal framing (all other) U-1.87 U-1.87 U-1.87
Skylight with Curb, Glass, % of Roof
0%–2.0% U-11.23 0.36 U-11.23 0.19 U-11.23
NR
2.1%–5.0% U-11.23 0.19 U-11.23 0.16 U-11.23
Skylight with Curb, Plastic, % of Roof
0%–2.0% U-10.78 0.34 U-10.78 0.27 U-10.78
NR
2.1%–5.0% U-10.78 0.27 U-10.78 0.27 U-10.78
Skylight without Curb, All, % of Roof
0%–2.0% U-7.72 0.36 U-7.72 0.19 U-7.72
NR
2.1%–5.0% U-7.72 0.19 U-7.72 0.19 U-7.72
c.i. = continuous insulation
f.i. = fully insulated

SBC 601-CR-18 19
CHAPTER 5 BUILDING ENVELOPE REQUIREMENTS

TABLE 5.1 Building Envelope Requirements for Climate Zone 3 SI

Nonresidential Residential Semiconditioned
Assembly Insulation Assembly Insulation Assembly Insulation
Opaque Elements Max U-Value Min R-Value Max U-Value Min R-Value Max U-Value Min R-Value
W/m2·°C m2·°C/W W/m2·°C m2·°C/W W/m 2·°C m2·°C/W
Roofs
Insulation Entirely above Deck U-0.511 R-1.81 c.i. U-0.397 R-2.38 c.i. U-1.759 R-0.42 c.i.
Metal Buildings U-0.528 R-1.76 c.i. U-0.528 R-1.76 c.i. U-1.362 R-0.60 c.i.
Attic with Steel Joists U-0.272 R-4.40 U-0.216 R-5.96 U-0.647 R-1.50
Walls, Above-Grade
Mass U-1.588 R-0.39 c.i. U-0.414 R-2.17 c.i U-1.588 R-0.39 c.i.
Metal Building U-0.255 R-3.77 c.i. U-0.255 R-3.77 c.i. U-0.312 R-3.05 c.i.
Steel-Framed U-0.340 R-2.43 c.i. U-0.340 R-2.43 c.i. U-0.964 R-0.53 c.i.
Walls, Below-Grade
Below-Grade Wall C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i. C-1.305 R-0.62 c.i.
Floors
Mass U-0.567 R-1.22 c.i. U-0.567 R-1.22 c.i. U-0.567 R-1.22 c.i.
Steel-Joist U-0.624 R-1.09 c.i. U-0.624 R-1.09 c.i. U-0.624 R-1.09 c.i.
Slab-On-Grade Floors
Unconditioned F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i. F-0.727 R-1.18 f.i.
Opaque Doors
Swinging U-2.84 U-2.84 U-2.84
Nonswinging U-5.90 U-5.90 U-5.90

Assembly Assembly Max. Assembly Assembly Max. Assembly Assembly Max.

Fenestration Max U-Value SHGC Max U-Value SHGC Max U-Value SHGC
W/m2·°C W/m2·°C W/m 2·°C
Vertical Glazing, 0% to 40% of Wall
Nonmetal framing (all) U-2.89 U-2.89 U-2.89
Metal framing U-2.89 U-2.89 U-2.89
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-2.89 U-2.89 U-2.89
Metal framing (all other) U-2.89 U-2.89 U-2.89
Vertical Glazing, >40% to 50% of Wall
Nonmetal framing (all) U-2.38 U-2.38 U-2.38
Metal framing U-2.38 U-2.38 U-2.38
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-2.38 U-2.38 U-2.38
Metal framing (all other) U-2.38 U-2.38 U-2.38
Vertical Glazing, >50% to 100% of Wall
Nonmetal framing (all) U-1.87 U-1.87 U-1.87
Metal framing U-1.87 U-1.87 U-1.87
(curtainwall/storefront)d 0.25 0.25 NR
Metal framing (entrance door) U-1.87 U-1.87 U-1.87
Metal framing (all other) U-1.87 U-1.87 U-1.87
Skylight with Curb, Glass, % of Roof
0%–2.0% U-11.23 0.36 U-11.23 0.19 U-11.23
NR
2.1%–5.0% U-11.23 0.19 U-11.23 0.16 U-11.23
Skylight with Curb, Plastic, % of Roof
0%–2.0% U-10.78 0.34 U-10.78 0.27 U-10.78
NR
2.1%–5.0% U-10.78 0.27 U-10.78 0.27 U-10.78
Skylight without Curb, All, % of Roof
0%–2.0% U-7.72 0.36 U-7.72 0.19 U-7.72
NR
2.1%–5.0% U-7.72 0.19 U-7.72 0.19 U-7.72
c.i. = continuous insulation
f.i. = fully insulated

SBC 601-CR-18 20