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// CODE SNIPPET

2308.4.4 Framing Around Openings

Building Code 2015 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.4 Floor Framing > 2308.4.4 Framing Around Openings
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Trimmer and header joists shall be doubled, or of lumber of equivalent cross section, where the span of the header exceeds 4 feet (1219 mm). The ends of header joists more than 6 feet (1829 mm) in length shall be supported by framing anchors or joist hangers unless bearing on a beam, partition or wall. Tail joists over 12 feet (3658 mm) in length shall be supported at the header by framing anchors or on ledger strips not less than 2 inches by 2 inches (51 mm by 51 mm).

2308.4.4.1 Openings in Floor Diaphragms in Seismic Design Categories B, C, D and E

Openings in horizontal diaphragms in Seismic Design Categories B, C, D and E with a dimension that is greater than 4 feet (1219 mm) shall be constructed with metal ties and blocking in accordance with this section and Figure 2308.4.4.1(1). Metal ties shall be not less than 0.058 inch [1.47 mm (16 galvanized gage)] in thickness by 11/2 inches (38 mm) in width and shall have a yield stress not less than 33,000 psi (227 Mpa). Blocking shall extend not less than the dimension of the opening in the direction of the tie and blocking. Ties shall be attached to blocking in accordance with the manufacturer's instructions but with not less than eight 16d common nails on each side of the header-joist intersection.

Openings in floor diaphragms in Seismic Design Categories D and E shall not have any dimension exceeding 50 percent of the distance between braced wall lines or an area greater than 25 percent of the area between orthogonal pairs of braced wall lines [see Figure 2308.4.4.1(2)]; or the portion of the structure containing the opening shall be designed in accordance with accepted engineering practice to resist the forces specified in Chapter 16, to the extent such irregular opening affects the performance of the conventional framing system.



FIGURE 2308.4.4.1(1) OPENINGS IN FLOOR AND ROOF DIAPHRAGMS



FIGURE 2308.4.4.1(2) OPENING LIMITATIONS FOR FLOOR AND ROOF DIAPHRAGMS

2308.4.4.2 Vertical Offsets in Floor Diaphragms in Seismic Design Categories D and E

In Seismic Design Categories D and E, portions of a floor level shall not be vertically offset such that the framing members on either side of the offset cannot be lapped or tied together in an approved manner in accordance with Figure 2308.4.4.2 unless the portion of the structure containing the irregular offset is designed in accordance with accepted engineering practice.

Exception: Framing supported directly by foundations need not be lapped or tied directly together.



FIGURE 2308.4.4.2 PORTIONS OF FLOOR LEVEL OFFSET VERTICALLY
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Related Code Sections


2308.4.4 Wood, Framing around openings
the performance of the conventional framing system. FIGURE 2308.4.4.1(1) OPENINGS IN FLOOR AND ROOF DIAPHRAGMS FIGURE 2308.4.4.1(2) OPENING ...
Building Code 2018 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.4 Floor framing > 2308.4.4 Framing around openings
2308.4.4 Wood, Framing Around Openings
the performance of the conventional framing system. FIGURE 2308.4.4.1(1) OPENINGS IN FLOOR AND ROOF DIAPHRAGMS FIGURE 2308.4.4.1(2 ...
Building Code 2015 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.4 Floor Framing > 2308.4.4 Framing Around Openings
2308.4.4.2 Wood, Vertical Offsets in Floor Diaphragms in Seismic Design Categories D and E
In Seismic Design Categories D and E, portions of a floor level shall not be vertically offset such that the framing members on either side ...
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2308.7.6.1 Wood, Openings in roof diaphragms in Seismic Design Categories B, C, D and E
In buildings classified as Seismic Design Category B, C, D or E. openings in horizontal diaphragms with a dimension that is greater than 4 feet ...
Building Code 2018 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.7 Roof and ceiling framing > 2308.7.6 Framing around openings > 2308.7.6.1 Openings in roof diaphragms in Seismic Design Categories B, C, D and E
2308.7.6.1 Wood, Openings in Roof Diaphragms in Seismic Design Categories B, C, D and E
In buildings classified as Seismic Design Category B, C, D or E. openings in horizontal diaphragms with a dimension that is greater than 4 feet ...
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