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ASHRAE-90.1-2022- - Page 048

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CHARGING LANGUAGE FOR PRESCRIPTIVE

Figure 5.5.2 Exterior and semiexterior building envelope.

  1. Doors that open directly from a space that is less than 3000 ft [2 ] in area and is separate from the building entrance.
  2. Self-closing doors in buildings in Climate Zones 0, 3, and 4 that have an air curtain unit complying with Sections 6.4.3.9 and 10.4.5.
  3. Self-closing doors in buildings 15 stories or less in Climate Zones 5 through 8 that have an air curtain unit complying with Sections 6.4.3.9 and 10.4.5.

climate.

The exterior surfaces of conditioned vestibules shall comply with the building envelope requirements for a conditioned space .

5.5.2 Semiexterior Building Envelope. If a building contains any semiheated space or unconditioned space then the semiexterior building envelope shall comply with the requirements for semiheated space in Tables 5.5-0 through 5.5-8 for the appropriate climate. (See Figure 5.5.2.)

The interior surfaces and exterior surfaces of unconditioned vestibules shall comply with the building envelope requirements for a semiheated space .

5.5.3 Opaque Elements. For all opaque elements, compliance with Tables 5.5-0 through 5.5-8 for each class of construction as described in Normative Appendix A, Sections A2 through A8 shall be demonstrated by one of the following two methods:

a. Providing a minimum rated R-value of insulation added to the assembly equal to or greater than the insu lation minimum R-value required of each insulation component. b. Providing insulation such that the maximum U-factor, C-factor, or F-factor for the entire assembly is not

exceeded as determined by one of the following:

  1. Precalculated values in accordance with Normative Appendix A, Section A1.1.

  2. Applicant-determined values in accordance with Normative Appendix A, Section A1.2 where such values are approved by the code official . Exceptions to 5.5.3:

  3. For opaque assemblies not complying with the classes of construction as described in Normative Appendix A, Sections A2 through A8, compliance with the maximum U-factors for the “attic and other” or “wood frame and other” opaque element conditions in Tables 5.5-0 through 5.5-8 shall be

46 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)

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