**Exceptions:** The following alterations need not comply with these requirements, provided such alterations will not increase the energy usage of the building:

- Installation of storm windows or glazing panels over existing glazing, provided the storm window or glazing panel contains a low-emissivity coating. However, a low-emissivity coating is not required where the existing glazing already has a low-emissivity coating. Installation is permitted to be either on the inside or outside of the existing glazing.
- Replacement of glazing in existing sash and frame, provided the U-factor and SHGC will be equal to or lower than before the glass replacement.
- Alterations to roof/ceiling, wall, or floor cavities that are insulated to full depth with insulation having a minimum nominal value of R-3.0/in.
- Alterations to walls and floors, where the existing structure is without framing cavities and no new framing cavities are created.
- Roof recovering.
- Removal and replacement of a roof membrane where there is existing roof insulation integral to or below the roof deck
- Replacement of existing doors that separate a conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided that an existing vestibule that separates a conditioned space from the exterior shall not be removed.
- Replacement of existing fenestration, provided that the area of the replacement fenestration does not exceed 25% of the total fenestration area of an existing building and that the U-factor and SHGC will be equal to or lower than before the fenestration replacement.

**Exception:** If there are recorded historical climatic data available for a construction site, they may be used to determine compliance if approved by the building official.

- Section 5.5, "Prescriptive Building Envelope Option," provided that the fenestration area does not exceed the maximum allowed by Section 5.5.4.2, or
- Section 5.6, "Building Envelope Trade-Off Option."

**Exceptions:**

- Semiheated spaces in Climate Zones 1 through 6.
- Single wythe concrete masonry buildings in Climate Zone 2B.

- All air barrier components of each building envelope assembly shall be clearly identified or otherwise noted on construction documents.
- The joints, interconnections, and penetrations of the air barrier components, including lighting fixtures, shall be detailed or otherwise noted.
- The continuous air barrier shall extend over all surfaces of the building envelope (at the lowest floor, exterior walls, and ceiling or roof).
- The continuous air barrier shall be designed to resist positive and negative pressures from wind, stack effect, and mechanical ventilation.

- Joints around fenestration and door frames (both manufactured and site-built)
- Junctions between walls and floors, between walls at building corners, and between walls and roofs or ceilings
- Penetrations through the air barrier in building envelope roofs, walls, and floors
- Building assemblies used as ducts or plenums
- Joints, seams, connections between planes, and other changes in air barrier materials

- Materials that have an air permeance not exceeding 0.004 cfm/ft
^{2}under a pressure differential of 0.3 in. H_{2}O (1.57 psf) when tested in accordance with ASTM E 2178. The following materials meet these requirements:- Plywoodâ€”minimum 3/8 in.
- Oriented strand boardâ€”minimum 3/8 in.
- Extruded polystyrene insulation boardâ€”minimum 1/ 2 in.
- Foil-faced urethane insulation boardâ€”minimum 1/2 in.
- Exterior gypsum sheathing or interior gypsum boardâ€”minimum 1/2 in.
- Cement boardâ€”minimum 1/2 in.
- Built-up roofing membrane
- Modified bituminous roof membrane
- Fully adhered single-ply roof membrane
- A Portland cement/sand parge, stucco, or gypsum plasterâ€”minimum 1/2 in. thick
- Cast-in-place and precast concrete
- Sheet metal
- Closed-cell 2 lb/ft
^{3}nominal density spray polyurethane foamâ€”minimum 1 in.

- Assemblies of materials and components (sealants, tapes, etc.) that have an average air leakage not to exceed 0.04 cfm/ft
^{2}under a pressure differential of 0.3 in. H_{2}O (1.57 psf) when tested in accordance with ASTM E 2357, ASTM E 1677, ASTM E 1680, or ASTM E283. The following assemblies meet these requirements:- Concrete masonry walls that are
- fully grouted, or
- painted to fill the pores.

- Concrete masonry walls that are

- 1.0 cfm/ft
^{2}for glazed swinging entrance doors and revolving doors, tested at a pressure of at least 1.57 psf in accordance with AAMA/WDMA/CSA 101/I.S.2/ A440, NFRC 400, or ASTM E283; - 0.06 cfm/ft
^{2}for curtainwall and storefront glazing, tested at a pressure of at least 1.57 psf or higher in accordance with NFRC 400 or ASTM E283; - 0.3 cfm/ft
^{2}for unit skylights having condensation weep-age openings, tested at a pressure of at least 1.57 psf in accordance with AAMA/WDMA/CSA 101/I.S.2/A440 or NFRC 400, or 0.5 cfm/ft^{2}tested at a pressure of at least 6.24 psf in accordance with AAMA/WDMA/CSA 101/ I.S.2/A440; - 1.3 cfm/ft
^{2}for nonswinging doors intended for vehicular access and material transportation, with a minimum opening rate of 32 in./s, tested at a pressure of at least 1.57 psf or higher in accordance with ANSI/DASMA 105, NFRC 400, or ASTM E283. - 0.4 cfm/ft
^{2}for other nonswinging opaque doors, glazed sectional garage doors, and upward acting nonswinging glazed doors tested at a pressure of at least 1.57 psf or higher in accordance with ANSI/DASMA 105, NFRC 400, or ASTM E283; and - 0.2 cfm/ft
^{2}for all other products tested at a pressure of at least 1.57 psf in accordance with AAMA/WDMA/CSA 101/I.S.2/A440 or NFRC 400, or 0.3 cfm/ft^{2}tested at a pressure of at least 6.24 psf in accordance with AAMA/ WDMA/CSA 101/I.S/A440.

**Exceptions:**

- Field-fabricated fenestration and doors
- Metal coiling doors in semiheated spaces in Climate Zones 1 through 6
- Products in buildings that comply with a whole building air leakage rate of 0.4 cfm/ft
^{2}under a pressure differential of 0.3 in. H_{2}O, 1.57 psf when tested in accordance with ASTM E 779

^{2}or 2% of the gross conditioned floor area for that level of the building. The exterior envelope of conditioned vestibules shall comply with the requirements for a conditioned space. The interior and exterior envelope of unconditioned vestibules shall comply with the requirements for a semiheated space.

**Exceptions:**

- Building entrances with revolving doors
- Doors not intended to be used as a building entrance
- Doors opening directly from a dwelling unit
- Building entrances in buildings located in Climate Zone 1 or 2
- Building entrances in buildings that are located in Climate Zone 3, less than four stories above grade, and less than 10,000 ft
^{2}in gross conditioned floor area - Building entrances in buildings that are located in Climate Zone 4, 5, 6, 7, or 8 and are less than 1000 ft
^{2}in gross conditioned floor area - Doors that open directly from a space that is less than 3000 ft
^{2}in area and is separate from the building entrance - Semiheated spaces
- Enclosed elevator lobbies for
*building entrances*directly from parking garages

^{2}and greater, and when the doors opening into and out of the vestibule are equipped with automatic, electrically driven, self-closing devices, the interior and exterior doors shall have a minimum distance between them of not less than 16 ft.

**Table 5.5-1 Building Envelope Requirements for Climate Zone 1 (A,B,C)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | U-0.048 | R-20 c.i. | U-0.039 | R-25 c.i. | U-0.218 | R-3.8 c.i. | |||

Metal Building^{a} |
U-0.041 | R-10 + R-19 FC | U-0.041 | R-10 + R-19 FC | U-0.115 | R-10 | |||

Attic and Other | U-0.027 | R-38 | U-0.027 | R-38 | U-0.081 | R-13 | |||

Walls, above Grade |
|||||||||

Mass | U-0.580 | NR | U-0.151^{b} |
R-5.7 c.i.^{b} |
U-0.580 | NR | |||

Metal Building | U-0.094 | R-0 + R-9.8 c.i. | U-0.094 | R-0 + R-9.8 c.i. | U-0.352 | NR | |||

Steel Framed | U-0.124 | R-13 | U-0.124 | R-13 | U-0.352 | NR | |||

Wood Framed and Other | U-0.089 | R-13 | U-0.089 | R-13 | U-0.292 | NR | |||

Wall, below Grade |
|||||||||

Below Grade Wall | C-1.140 | NR | C-1.140 | NR | C-1.140 | NR | |||

Floors |
|||||||||

Mass | U-0.322 | NR | U-0.322 | NR | U-0.322 | NR | |||

Steel Joist | U-0.350 | NR | U-0.350 | NR | U-0.350 | NR | |||

Wood Framed and Other | U-0.282 | NR | U-0.282 | NR | U-0.282 | NR | |||

Slab-on-Grade Floors |
|||||||||

Unheated | F-0.730 | NR | F-0.730 | NR | F-0.730 | NR | |||

Heated | F-1.020 | R-7.5 for 12 in. | F-1.020 | R-7.5 for 12 in. | F-1.020 | R-7.5 for 12 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.700 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-1.450 | U-0.500 | U-1.450 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.50^{c} |
U-0.50^{c} |
U-0.93 | ||||||

Metal framing, fixed | U-0.57^{c} |
U-0.57^{c} |
U-1.20 | ||||||

Metal framing, operable | U-0.65^{c} |
SHGC-0.25 | 1.10 | U-0.65^{c} |
SHGC-0.25 | 1.10 | U-1.20 | NR | NR |

Metal framing, entrance door | U-1.10^{c} |
U-1.10^{c} |
U-1.10^{c} |
||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.75 | SHGC-0.35 | NR | U-0.75 | SHGC-0.35 | NR | U-1.80 | 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).

b. Exception to Section 5.5.3.2 applies for mass walls above grade.

c. For locations in Climate Zone 1 with a cooling design temperature of 95Â°F and greater, see Section 5.5.4.3 for the maximum U-factors for vertical fenestration.

**Table 5.5-2 Building Envelope Requirements for Climate Zone 2 (A,B)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | U-0.039 | R-25 c.i. | U-0.039 | R-25 c.i. | U-0.173 | R-5 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-0.151^{b} |
R-5.7 c.i.^{b} |
U-0.123 | R-7.6 c.i. | U-0.580 | NR | |||

Metal Building | U-0.094 | R-0 + R-9.8 c.i. | U-0.094 | R-0 + R-9.8 c.i. | U-0.162 | R-13 | |||

Steel Framed | U-0.084 | R-13 + R-3.8 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-0.089 | R-13 | 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-0.107 | R-6.3 c.i. | U-0.087 | R-8.3 c.i. | U-0.322 | NR | |||

Steel Joist | U-0.038 | R-30 | U-0.038 | R-30 | U-0.069 | R-13 | |||

Wood Framed and Other | U-0.033 | R-30 | U-0.033 | R-30 | U-0.066 | R-13 | |||

Slab-on-Grade Floors |
|||||||||

Unheated | F-0.730 | NR | F-0.730 | NR | F-0.730 | NR | |||

Heated | F-0.900 | R-10 for 24 in. | F-0.860 | R-15 for 24 in. | F-1.020 | R-7.5 for 12 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.700 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-1.450 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.40 | U-0.40 | U-0.93 | ||||||

Metal framing, fixed | U-0.57 | U-0.57 | U-1.20 | ||||||

Metal framing, operable | U-0.65 | SHGC-0.25 | 1.10 | U-0.65 | SHGC-0.25 | 1.10 | U-1.20 | NR | NR |

Metal framing, entrance door | U-0.83 | U-0.77 | U-0.83 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.65 | SHGC-0.35 | NR | U-0.65 | SHGC-0.35 | NR | U-1.80 | 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).

b. Exception to Section 5.5.3.2 applies for mass walls above grade.

**Table 5.5-3 Building Envelope Requirements for Climate Zone 3 (A,B,C)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | 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-0.700 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-1.450 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.35 | U-0.35 | U-0.87 | ||||||

Metal framing, fixed | U-0.50 | U-0.50 | U-1.20 | ||||||

Metal framing, operable | U-0.60 | SHGC-0.25 | 1.10 | U-0.60 | SHGC-0.25 | 1.10 | U-1.20 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.55 | SHGC-0.35 | NR | U-0.55 | SHGC-0.35 | NR | U-1.70 | 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).

**Table 5.5-4 Building Envelope Requirements for Climate Zone 4 (A,B,C)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | U-0.032 | R-30 c.i. | U-0.032 | R-30 c.i. | U-0.093 | R-10 c.i. | |||

Metal Building^{a} |
U-0.037 | R-19 + R-11 Ls or R-25 + R-8 Ls |
U-0.037 | R-19 + R-11 Ls or R-25 + R-8 Ls |
U-0.082 | R-19 | |||

Attic and Other | U-0.021 | R-49 | U-0.021 | R-49 | U-0.034 | R-30 | |||

Walls, above Grade |
|||||||||

Mass | U-0.104 | R-9.5 c.i. | U-0.090 | R-11.4 c.i. | U-0.580 | NR | |||

Metal Building | U-0.060 | R-0 + R-15.8 c.i. | U-0.050 | R-0 + R-19 c.i. | U-0.162 | R-13 | |||

Steel Framed | U-0.064 | R-13 + R-7.5 c.i. | U-0.064 | R-13 + R-7.5 c.i. | U-0.124 | R-13 | |||

Wood Framed and Other | U-0.064 | R-13 + R-3.8 c.i. or R-20 |
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-0.119 | R-7.5 c.i. | C-0.092 | R-10 c.i. | C-1.140 | NR | |||

Floors |
|||||||||

Mass | U-0.057 | R-14.6 c.i. | U-0.051 | R-16.7 c.i. | U-0.107 | R-6.3 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-0.520 | R-15 for 24 in. | F-0.520 | R-15 for 24 in. | F-0.730 | NR | |||

Heated | F-0.843 | R-20 for 24 in. | F-0.688 | R-20 for 48 in. | F-0.900 | R-10 for 24 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.500 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-1.450 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.35 | U-0.35 | U-0.51 | ||||||

Metal framing, fixed | U-0.42 | U-0.42 | U-0.73 | ||||||

Metal framing, operable | U-0.50 | SHGC-0.40 | 1.10 | U-0.50 | SHGC-0.40 | 1.10 | U-0.81 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.50 | SHGC-0.40 | NR | U-0.50 | SHGC-0.40 | NR | U-1.15 | NR | NR |

**Table 5.5-5 Building Envelope Requirements for Climate Zone 5 (A,B,C)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | U-0.032 | R-30 c.i. | U-0.032 | R-30 c.i. | U-0.063 | R-15 c.i. | |||

Metal Building^{a} |
U-0.037 | R-19 + R-11 Ls or R-25 + R-8 Ls |
U-0.037 | R-19 + R-11 Ls or R-25 + R-8 Ls |
U-0.082 | R-19 | |||

Attic and Other | U-0.021 | R-49 | U-0.021 | R-49 | U-0.034 | R-30 | |||

Walls, above Grade |
|||||||||

Mass | U-0.090 | R-11.4 c.i. | U-0.080 | R-13.3 c.i. | U-0.151^{b} |
R-5.7 c.i.^{b} |
|||

Metal Building | U-0.050 | R-0 + R-19 c.i. | U-0.050 | R-0 + R-19 c.i. | U-0.094 | R-0 + R-9.8 c.i. | |||

Steel Framed | U-0.055 | R-13 + R-10 c.i. | U-0.055 | R-13 + R-10 c.i. | U-0.084 | R-13+R-3.8 c.i. | |||

Wood Framed and Other | U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.089 | R-13 | |||

Wall, below Grade |
|||||||||

Below Grade Wall | C-0.119 | R-7.5 c.i. | C-0.092 | R-10 c.i. | C-1.140 | NR | |||

Floors |
|||||||||

Mass | U-0.057 | R-14.6 c.i. | U-0.051 | R-16.7 c.i. | U-0.107 | R-6.3 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-0.520 | R-15 for 24 in. | F-0.510 | R-20 for 24 in. | F-0.730 | NR | |||

Heated | F-0.688 | R-20 for 48 in. | F-0.688 | R-20 for 48 in. | F-0.900 | R-10 for 24 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.500 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-1.450 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.32 | U-0.32 | U-0.45 | ||||||

Metal framing, fixed | U-0.42 | U-0.42 | U-0.62 | ||||||

Metal framing, operable | U-0.50 | SHGC-0.40 | 1.10 | U-0.50 | SHGC-0.40 | 1.10 | U-0.70 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.50 | SHGC-0.40 | NR | U-0.50 | SHGC-0.40 | NR | U-0.98 | NR | NR |

b. Exception to Section 5.5.3.2 applies for mass walls above grade.

**Table 5.5-6 Building Envelope Requirements for Climate Zone 6 (A,B)***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | U-0.032 | R-30 c.i. | U-0.032 | R-30 c.i. | U-0.063 | R-15 c.i. | |||

Metal Building^{a} |
U-0.031 | R-25 + R-11 Ls | U-0.029 | R-30 + R-11 Ls | U-0.060 | R-19 + R-19 | |||

Attic and Other | U-0.021 | R-49 | U-0.021 | R-49 | U-0.034 | R-30 | |||

Walls, above Grade |
|||||||||

Mass | U-0.080 | R-13.3 c.i. | U-0.071 | R-15.2 c.i. | U-0.151^{b} |
R-5.7 c.i.^{b} |
|||

Metal Building | U-0.050 | R-0 + R-19 c.i. | U-0.050 | R-0 + R-19 c.i. | U-0.094 | R-0 + R-9.8 c.i. | |||

Steel Framed | U-0.049 | R-13 + R-12.5 c.i. | U-0.049 | R-13 + R-12.5 c.i. | U-0.084 | R-13+R-3.8 c.i. | |||

Wood Framed and Other | U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.089 | R-13 | |||

Wall, below Grade |
|||||||||

Below Grade Wall | C-0.092 | R-10 c.i. | C-0.063 | R-15 c.i. | C-0.119 | R-7.5 c.i | |||

Floors |
|||||||||

Mass | U-0.051 | R-16.7 c.i. | U-0.051 | R-16.7 c.i. | U-0.087 | R-8.3 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-0.051 | R-19 | |||

Slab-on-Grade Floors |
|||||||||

Unheated | F-0.510 | R-20 for 24 in. | F-0.434 | R-20 for 48 in. | F-0.730 | NR | |||

Heated | F-0.688 | R-20 for 48 in. | F-0.671 | R-25 for 48 in. | F-0.860 | R-15 for 24 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.500 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-0.500 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.32 | U-0.32 | U-0.45 | ||||||

Metal framing, fixed | U-0.42 | U-0.42 | U-0.51 | ||||||

Metal framing, operable | U-0.50 | SHGC-0.40 | 1.10 | U-0.50 | SHGC-0.40 | 1.10 | U-0.59 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.50 | SHGC-0.40 | NR | U-0.50 | SHGC-0.40 | NR | U-0.85 | NR | NR |

b, Exception to Section 5.5.3.2 applies for mass walls above grade.

**Table 5.5-7 Building Envelope Requirements for Climate Zone 7***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | 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-0.029 | R-30 + R-11 Ls | U-0.029 | R-30 + 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-0.071 | R-15.2 c.i. | U-0.071 | R-15.2 c.i. | U-0.123 | R-7.6 c.i. | |||

Metal Building | U-0.044 | R-0 + R.22.1 c.i. | U-.044 | R-0 + R.22.1 c.i. | U-0.072 | R-0 + R-13 c.i. | |||

Steel Framed | U-0.049 | R-13 + R-12.5 c.i. | U-0.042 | R-13 + R-15.6 c.i. | U-0.064 | R-13 + R-7.5 c.i. | |||

Wood Framed and Other | U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.051 | R-13 + R-7.5 c.i. or R-19 + R-5 c.i. |
U-0.064 | R-13 + R-3.8 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-0.042 | R-20.9 c.i. | U-0.042 | R-20.9 c.i. | U-0.074 | R-10.4 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-0.051 | R-19 | |||

Slab-on-Grade Floors |
|||||||||

Unheated | F-0.510 | R-20 for 24 in. | F-0.434 | R-20 for 48 in. | F-0.730 | NR | |||

Heated | F-0.671 | R-25 for 48 in. | F-0.671 | R-25 for 48 in. | F-0.860 | R-15 for 24 in. | |||

Opaque Doors |
|||||||||

Swinging | U-0.500 | U-0.500 | U-0.700 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-0.500 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.32 | U-0.32 | U-0.32 | ||||||

Metal framing, fixed | U-0.38 | U-0.38 | U-0.38 | ||||||

Metal framing, operable | U-0.40 | SHGC-0.45 | 1.10 | U-0.40 | SHGC-0.45 | 1.10 | U-0.44 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.50 | NR | NR | U-0.50 | NR | NR | U-0.85 | NR | NR |

**Table 5.5-8 Building Envelope Requirements for Climate Zone 8***

Opaque Elements | Nonresidential | Residential | Semiheated | ||||||
---|---|---|---|---|---|---|---|---|---|

Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | Assembly Maximum | Insulation Min. R-Value | ||||

Roofs |
|||||||||

Insulation Entirely above Deck | 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-0.500 | U-0.500 | U-0.500 | ||||||

Nonswinging | U-0.500 | U-0.500 | U-0.500 | ||||||

Fenestration |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |
Assembly Max. U |
Assembly Max. SHGC |
Assembly Min. VT/SHGC |

Vertical Fenestration, 0%â€”40% of Wall |
(for all frame types) | (for all frame types) | (for all frame types) | ||||||

Nonmetal framing, all | U-0.32 | U-0.32 | U-0.32 | ||||||

Metal framing, fixed | U-0.38 | U-0.38 | U-0.38 | ||||||

Metal framing, operable | U-0.40 | SHGC-0.45 | 1.10 | U-0.40 | SHGC-0.45 | 1.10 | U-0.44 | NR | NR |

Metal framing, entrance door | U-0.77 | U-0.68 | U-0.77 | ||||||

Skylight, 0%â€”3% of Roof |
|||||||||

All types | U-0.50 | NR | NR | U-0.50 | NR | NR | U-0.85 | NR | NR |

**Figure 5.5.2. Exterior and semiexterior building envelope.**

- Minimum rated R-values of insulation for the thermal resistance of the added insulation in framing cavities and continuous insulation only. Specifications listed in Normative Appendix A for each class of construction shall be used to determine compliance.
- Maximum U-factor, C-factor, or F-factor for the entire assembly. The values for typical construction assemblies listed in Normative Appendix A shall be used to determine compliance.

**Exceptions:**

- For assemblies significantly different than those in Appendix A, calculations shall be performed in accordance with the procedures required in Appendix A.
- For multiple assemblies within a single class of construction for a single space-conditioning category, compliance shall be shown for either (a) the most restrictive requirement or (b) an area-weighted average U-factor, C-factor, or F-factor.

- A minimum three-year-aged solar reflectance of 0.55 and a minimum three-year-aged thermal emittance of 0.75 when tested in accordance with CRRC-1 Standard
- A minimum Solar Reflectance Index of 64 when determined in accordance with the Solar Reflectance Index method in ASTM E1980 using a convection coefficient of 2.1 Btu/hâ€¢ft
^{2}â€¢Â°F, based on three-year-aged solar reflectance and three-year-aged thermal emittance tested in accordance with CRRC-1 Standard - Increased roof insulation levels found in Table 5.5.3.1.1
**Exceptions:**- Ballasted roofs with a minimum stone ballast of 17 lb/ft
^{2}or 23 lb/ft^{2}pavers - Vegetated roof systems that contain a minimum thickness of 2.5 in. of growing medium and covering a minimum of 75% of the roof area with durable plantings
- Roofs where a minimum of 75% of the roof area
- is shaded during the peak sun angle on June 21 by permanent components or features of the building;
- is covered by offset photovoltaic arrays, building-integrated photovoltaic arrays, or solar air or water collectors; or
- is permitted to be interpolated using a combination of 1 and 2 above

- Steep-sloped roofs
- Low-sloped metal building roofs in Climate Zones 2 and 3
- Roofs over ventilated attics, roofs over semiheated spaces, or roofs over conditioned spaces that are not cooled spaces
- Asphaltic membranes in Climate Zones 2 and 3

- Ballasted roofs with a minimum stone ballast of 17 lb/ft

The values for three-year-aged solar reflectance and three-year-aged thermal emittance shall be determined by a laboratory accredited by a nationally recognized accreditation organization and shall be labeled and certified by the manufacturer.

**Table 5.5.3.1.1 Increased Roof Insulation Levels**

Roofs |
Nonresidential |
Residential |
||
---|---|---|---|---|

Opaque Elements |
Assembly Maximum |
Insulation Min. R-Value |
Assembly Maximum |
Insulation Min. R-Value |

Insulation entirely above deck | U-0.030 | R-33 | U-0.029 | R-34 |

Metal buildings | U-0.028 | R-35 |

**Exception:** Alternatively, for mass walls, where the requirement in Tables 5.5-1 through 5.5-8 is for a maximum assembly U-0.151 followed by footnote "b," ASTM C90 concrete block walls, ungrouted or partially grouted at 32 in. or less on center vertically and 48 in.or less on center horizontally, shall have ungrouted cores filled with material having a maximum thermal conductivity of 0.44 Btuâ€¢in./hâ€¢ft^{2}â€¢Â°F. Other mass walls with integral insulation shall meet the criteria when their U-factors are equal to or less than those for the appropriate thickness and density in the "Partly Grouted, Cells Insulated" column of Table A3.1-3.

When a wall consists of both above-grade and below-grade portions, the entire wall for that story shall be insulated on either the exterior or the interior or be integral.

- If insulated on the interior, the wall shall be insulated to the above-grade wall requirements.
- If insulated on the exterior or integral, the below-grade wall portion shall be insulated to the below-grade wall requirements, and the above-grade wall portion shall be insulated to the above-grade wall requirements.

**Exception:** Where framing, including metal and wood studs, is used, compliance shall be based on the maximum assembly C-factor.

**Exception:** If there are multiple assemblies within a single class of construction for a single space-conditioning category, compliance shall be based on an area-weighted average U-factor, SHGC, VT/SHGC, or LSG. It is not acceptable to do an area-weighted average across multiple classes of construction or multiple space-conditioning categories.

**Exception:** Vertical fenestration complying with Exception (3) to Section 5.5.4.4.1.

**Exception:** The total skylight area is permitted to be increased to no greater than 6% of the gross roof area, provided the skylights meet all of the criteria in Exception (1) to Section 5.5.4.4.2 and the total daylight area under skylights is a minimum of half the floor area of the space.

- 2500 ft
^{2}and greater; - directly under a roof with ceiling heights greater than 15 ft; and
- one of the following space types: office, lobby, atrium, concourse, corridor, storage (including nonrefrigerated warehouse), gymnasium, fitness/exercise area, playing area, gymnasium seating area, convention exhibit/event space, courtroom, automotive service, fire station engine room, manufacturing corridor/transition and bay areas, retail, library reading and stack areas, distribution/sorting area, transportation baggage and seating areas, or workshop,
the total daylight area under skylights shall be a minimum of half the floor area and either

- provide a minimum skylight area to daylight area under skylights of 3% with a skylight VT of at least 0.40 or
- provide a minimum skylight effective aperture of at least 1%.

These skylights shall have a glazing material or diffuser with a measured haze value greater than 90% when tested according to ASTM D1003. General lighting in the daylight area shall be controlled as described in Section 9.4.1.1(f).

**Exceptions:**

- Enclosed spaces in Climate Zones 6 through 8
- Enclosed spaces where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed space for more than 1500 daytime hours per year between 8 a.m. and 4 p.m.
- Enclosed spaces where the daylight area under roof monitors is greater than 50% of the enclosed space floor area
- Enclosed spaces where it is documented that 90% of the skylight area is shaded on June 21 in the Northern Hemisphere (December 21 in the Southern Hemisphere) at noon by permanent architectural features of the building
- Enclosed spaces where the total area minus the primary and secondary sidelighted area(s) is less than 2500 ft
^{2}and where the lighting is controlled according to sidelighting requirements described in Section 9.4.1.1(e)

However, for locations in Climate Zone 1 with a cooling design temperature of 95Â°F and greater, the maximum allowed U-factors for vertical fenestration for all conditioned spaces, nonresidential and residential, are U-0.32 for nonmetal framing, U-0.50 for fixed metal framing, U-0.65 for operable metal framing, and U-0.83 for entrance door metal framing.

**Exception:** The U-factor for skylights is permitted to be increased to no greater than 0.90 Btu/hâ€¢ft^{2}â€¢Â°F in Climate Zones 1 through 3 and 0.75 Btu/hâ€¢ft^{2}â€¢Â°F in Climate Zones 4 through 8, provided the skylights meet all of the criteria in Exception (1) to Section 5.5.4.4.2.

**Exceptions:**

- For demonstrating compliance for vertical fenestration shaded by opaque permanent projections that will last as long as the building itself, the SHGC in the proposed building shall be reduced by using the multipliers in Table 5.5.4.4.1. Permanent projections consisting of open louvers shall be considered to provide shading, provided that no sun penetrates the louvers during the peak sun angle on June 21.
Table 5.5.4.4.1 SHGC Multipliers for Permanent Projections

**Projection Factor****SHGC Multiplier (all Other Orientations)****SHGC Multiplier (North-Oriented)**0â€”0.10 1.00 1.00 >0.10â€”0.20 0.91 0.95 >0.20â€”0.30 0.82 0.91 >0.30â€”0.40 0.74 0.87 >0.40â€”0.50 0.67 0.84 >0.50â€”0.60 0.61 0.81 >0.60â€”0.70 0.56 0.78 >0.70â€”0.80 0.51 0.76 >0.80â€”0.90 0.47 0.75 >0.90â€”1.00 0.44 0.73 - For demonstrating compliance for vertical fenestration shaded by partially opaque permanent projections (e.g., framing with glass or perforated metal) that will last as long as the building itself, the projection factor (PF) shall be reduced by multiplying it by a factor of
*O*which is derived as follows:_{s},*O*_{s}= (A_{i}Ã— O_{i}) + (A_{f}Ã— O_{f})where

*O*_{s}= percent opacity of the shading device *A*_{i}= percent of the area of the shading device that is a partially opaque infill *O*_{i}= percent opacity of the infill for glass *O*= (100% â€”_{i}*T*)_{s}*,*where*T*is the solar transmittance as determined in accordance with NFRC 300; for perforated or decorative metal panels,_{s}*O*= percentage of solid material_{i}*A*_{f}= percent of the area of the shading device that represents the framing members *O*_{f}= percent opacity of the framing members; if solid, then 100% The SHGC in the proposed building then shall be reduced by using the multipliers in Table 5.5.4.4.1 for each fenestration product.

- Vertical fenestration that is located on the street side of the street-level story only, provided that
- the street side of the street-level story does not exceed 20 ft in height,
- the fenestration has a continuous overhang with a weighted average PF greater than 0.5, and
- the fenestration area for the street side of the street-level story is less than 75% of the gross wall area for the street side of the street-level story.

When this exception is utilized, separate calculations shall be performed for these sections of the building envelope, and these values shall not be averaged with any others for compliance purposes. No credit shall be given here or elsewhere in the building for not fully utilizing the fenestration area allowed.

- For dynamic glazing, the minimum SHGC shall be used to demonstrate compliance with this section. Dynamic glazing shall be considered separately from other vertical fenestration, and area-weighted averaging with other vertical fenestration that is not dynamic glazing shall not be permitted.
- Vertical fenestration that is north-oriented shall be allowed to have a maximum solar heat gain coefficient SHGC-0.05 greater than that specified in Tables 5.5-1 through 5.5-8. When this exception is utilized, separate calculations shall be performed for these sections of the building envelope, and these values shall not be averaged with any others for compliance purposes.

**Exceptions:**

- Skylights are exempt from SHGC requirements provided the following:
- They have a glazing material or diffuser with a measured haze value greater than 90% when tested according to ASTM D1003.
- They have a skylight VT greater than 0.40.
- They have all general lighting in the daylight area under skylights controlled by multilevel photocontrols in accordance with Section 9.4.1.1(f).

- For dynamic glazing, the minimum SHGC shall be used to demonstrate compliance with this section. Dynamic glazing shall be considered separately from other skylights, and area-weighted averaging with other skylights that is not dynamic glazing shall not be permitted.

*A*â‰¤ (_{W}*A*)/4 and_{T}*A*â‰¤ (_{E}*A*)/4_{T}*A*Ã— SHGC_{W}Ã— SHGC_{W}â‰¤ (A_{T}_{C})/4 and*A*Ã— SHGC_{E}_{E}â‰¤*(A*Ã— SHGC_{T}_{C})/4

where

A_{w} | = | west-oriented vertical fenestration area (oriented within 45 degrees of true west to the south and within 22.5 degrees of true west to the north in the northern hemisphere; oriented within 45 degrees of true west to the north and within 22.5 degrees of true west to the south in the southern hemisphere) |

A_{e} | = | east-oriented vertical fenestration area (oriented within 45 degrees of true east to the south and within 22.5 degrees of true east to the north in the northern hemisphere; oriented within 45 degrees of true east to the north and within 22.5 degrees of true east to the south in the southern hemisphere) |

A_{T} | = | total vertical fenestration area |

SHGC_{C} | = | SHGC criteria in Tables 5.5-1 through 5.5-8 for each climate zone |

SHGC_{E} | = | SHGC for east-oriented fenestration that complies with Section 5.5.4.4.1 |

SHGC_{W} | = | SHGC for west-oriented fenestration that complies with Section 5.5.4.4.1 |

**Exceptions:**

- Vertical fenestration that complies with Exception (3) Section 5.5.4.4.1.
- Buildings that have an existing building or existing permanent infrastructure within 20 ft to the south (north in the southern hemisphere) that is at least half as tall as the proposed building
- Buildings with shade on 75% of the west- and east-oriented vertical fenestration areas from permanent projections, existing buildings, existing permanent infrastructure, or topography at 9 a.m. and 3 p.m. on the summer solstice (June 21 in the northern hemisphere)
- Alterations and additions with no increase in vertical fenestration area
- Buildings where the west-oriented and east-oriented vertical fenestration area (as defined in Section 5.5.4.5) does not exceed 20% of the gross wall area for each of those faÃ§ades, and SHGC on those facades is no greater than 90% of the criteria in Tables 5.5-1 through 5.5-8
- Buildings in Climate Zone 8

**Exceptions:**

- A light-to-solar-gain ratio (LSG) of not less than 1.25 is allowed to be used as an alternative to VT/SHGC. When using this option, the center-of-glass VT and the center-of-glass SHGC shall be determined in accordance with NFRC 300 and NFRC 301, determined by an independent laboratory or included in a database published by a government agency, and certified by the manufacturer.
- Fenestration not covered in the scope of the NFRC 200
- Enclosed spaces where the daylight area under rooftop monitors is greater than 50% of the enclosed space floor area
- Enclosed spaces with skylight(s) that comply with Section 5.5.4.2.3
- Enclosed spaces where the sidelighting effective aperture is greater than or equal to 0.15
- For dynamic glazing, the VT/SHGC ratio and the LSG shall be determined using the maximum VT and maximum SHGC. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.

- the proposed building satisfies the provisions of Sections 5.1, 5.4, 5.7, and 5.8 and
- the envelope performance factor of the proposed building is less than or equal to the envelope performance factor of the budget building.

**Exception:** When insulation does not have such an identification mark, the installer of such insulation shall provide a signed and dated certification for the installed insulation listing the type of insulation, the manufacturer, the rated R-value, and, where appropriate, the initial installed thickness, the settled thickness, and the coverage area.

**Exception:** Where metal-building roof and metal-building wall insulation is compressed between the roof or wall skin and the structure

**Exception:** Insulation materials that rely on air spaces adjacent to reflective surfaces for their rated performance.

- the total combined area affected (including necessary clearances) is less than 1% of the opaque area of the assembly,
- the entire roof, wall, or floor is covered with insulation to the full depth required, or
- the effects of reduced insulation are included in calculations using an area-weighted-average method and compressed insulation values obtained from Table A9.4-2.

In all cases, air leakage through or around the recessed equipment to the conditioned space shall be limited in accordance with Section 5.4.3.

**Exception:** Doors with less than 25% glazing are not required to list SHGC and VT.

**Exceptions:**

- U-factors from Section A8.1 shall be an acceptable alternative for determining compliance with the U-factor criteria for skylights. Where credit is being taken for a low-emissivity coating, the emissivity of the coating shall be determined in accordance with NFRC 300. Emissivity shall be verified and certified by the manufacturer.
- U-factors from Section A8.2 shall be an acceptable alternative for determining compliance with the U-factor criteria for vertical fenestration.
- U-factors from Section A7 shall be an acceptable alternative for determining compliance with the U-factor criteria for opaque doors.
- For garage doors, ANSI/DASMA105 shall be an acceptable alternative for determining U-factors.

**Exceptions:**

- Shading coefficient (SC) of the center-of-glass multiplied by 0.86 shall be an acceptable alternative for determining compliance with the SHGC requirements for the overall fenestration area. SC shall be determined using a spectral data file determined in accordance with NFRC 300. SC shall be verified and certified by the manufacturer.
- SHGC of the center-of-glass shall be an acceptable alternative for determining compliance with the SHGC requirements for the overall fenestration area. SHGC shall be determined using a spectral data file determined in accordance with NFRC 300. SHGC shall be verified and certified by the manufacturer.
- SHGC from Section A8.1 shall be an acceptable alternative for determining compliance with the SHGC criteria for skylights. Where credit is being taken for a low-emissivity coating, the emissivity of the coating shall be determined in accordance with NFRC 300. Emissivity shall be verified and certified by the manufacturer.
- SHGC from Section A8.2 shall be an acceptable alternative for determining compliance with the SHGC criteria for vertical fenestration.

**Exceptions:** For skylights whose transmittances are not within the scope of NFRC 200, their transmittance shall be the solar photometric transmittance of the skylight glazing material(s) determined in accordance with ASTM E972.