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// CODE SNIPPET

718.2.6 Exterior Wall Coverings

Building Code 2015 of Utah > 7 Fire and Smoke Protection Features > 718 Concealed Spaces > 718.2 Fireblocking > 718.2.6 Exterior Wall Coverings
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Fireblocking shall be installed within concealed spaces of exterior wall coverings and other exterior architectural elements where permitted to be of combustible construction as specified in Section 1406 or where erected with combustible frames. Fireblocking shall be installed at maximum intervals of 20 feet (6096 mm) in either dimension so that there will be no concealed space exceeding 100 square feet (9.3 m2) between fireblocking. Where wood furring strips are used, they shall be of approved wood of natural decay resistance or preservative-treated wood. If noncontinuous, such elements shall have closed ends, with not less than 4 inches (102 mm) of separation between sections.

Exceptions:
  1. Fireblocking of cornices is not required in single-family dwellings. Fireblocking of cornices of a two-family dwelling is required only at the line of dwelling unit separation.
  2. Fireblocking shall not be required where the exterior wall covering is installed on noncombustible framing and the face of the exterior wall covering exposed to the concealed space is covered by one of the following materials:
    1. Aluminum having a minimum thickness of 0.019 inch (0.5 mm).
    2. Corrosion-resistant steel having a base metal thickness not less than 0.016 inch (0.4 mm) at any point.
    3. Other approved noncombustible materials.
  3. Fireblocking shall not be required where the exterior wall covering has been tested in accordance with, and complies with the acceptance criteria of, NFPA 285. The exterior wall covering shall be installed as tested in accordance with NFPA 285.
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