ASHRAE-90.1-2022- - Page 047

Extracted Content

An additional report identifying the corrective actions taken to seal leaks shall be submitted to the code official and the building owner and shall be deemed to satisfy the requirements of this section. d. Where the measured air leakage rate exceeds 0.45 cfm/ft [2], corrective actions must be made to the enve-

lope and an additional test completed where results are 0.45 cfm/ft [2] or less in order to demonstrate compliance. e. Reporting shall be in compliance with Section 4.2.5.1.2.

5.4.3.2 Continuous Air Barrier Design and Installation. The continuous air barrier shall be designed and installed in the following manner:

c. The continuous air barrier shall extend over all surfaces of the building envelope and be identified in the

construction documents to be continuous across the components of the below- grade areas, walls, fenes- tration, doors, and roofs . d. The continuous air barrier shall be designed to resist positive and negative pressures from wind, stack

effect, and mechanical ventilation and allow for anticipated movements. e. The following areas of the continuous air barrier in the building envelope shall be wrapped, sealed,

caulked, gasketed, or taped in an approved manner to minimize air leakage :

1. Joints around fenestration and door frames
2. Junctions between walls and floors ; between walls at building corners; between walls and roofs, including parapets and copings; and walls at foundations
3. Penetrations through the continuous air barrier in building envelope roofs, walls, and floors
4. Building assemblies used as ducts or plenums
5. Joints, seams, connections between planes, and other changes in continuous air barrier materials
6. Building and service components projecting through or attached through the continuous air barrier
7. Junctions of the continuous air barrier that separate conditioned spaces from unconditioned spaces, semiheated spaces, and areas that are not enclosed spaces 5.4.3.3 Loading Dock Weatherseals. In Climate Zones 0 and 4 through 8, cargo doors and loading dock doors shall be equipped with weatherseals to restrict air leakage when vehicles are parked in the doorway.

5.4.3.4 Vestibules and Revolving Doors. Vestibules and revolving doors shall be installed in accordance with this section.

5.4.3.4.1 Location. Building entrances that separate conditioned space from the exterior shall have one of the following:

a. An enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing

devices b. A revolving door or doors opening into a vestibule or directly into the conditioned space c. A combination of (a) and (b)

5.4.3.4.2 Vestibule Size. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. Interior and exterior doors shall have a minimum distance between them of not less than 7 ft when in the closed position. The floor area of each vestibule shall not exceed the greater of 50 ft [2] or 2% of the gross conditioned floor area for that level of the building .

5.4.3.4.3 Vestibule Envelope. The exterior surfaces of both conditioned vestibules and unconditioned vestibules shall comply with the continuous air barrier requirements.

VESTIBULE EXCEPTIONS

2. Doors opening directly from a dwelling unit.
3. Building entrances in buildings located in Climate Zone 1 or 2.
4. Doors opening into semiheated spaces .
5. Enclosed elevator lobbies for building entrances directly from parking garages.
6. Building entrances in buildings that are located in Climate Zone 3, where the building is less than four stories above grade and less than 10,000 ft [2] in gross conditioned floor area.
7. Building entrances in buildings that are located in Climate Zone 0, 4, 5, 6, 7, or 8, where the building is less than 1000 ft [2] in gross conditioned floor area.

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 45