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Old 04-13-2013, 02:05 PM   #1
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Framing of opening in ceiling


I have a question about interpreting building code.
I have to cut a ceiling joist for a range hood duct vent to pass. The joists are 2x6 with a 12 foot span and spaced at 16 inches. The plan is to cut about 2 feet of one joist, and put on a header to support, as shown in the photos. I need help interpreting 2 aspects of one line of code to be sure i'm ok: "Single trimmer joists may be used to carry a single header joist that is located within 3 feet (914 mm) of the trimmer joist bearing."

1) Does single trimmer joist mean the existing joists on either side can be used to support the header (rather than adding a new full-span joists on either side to support the header)

2) What is the "trimmer joist bearing"? Is that where the end of the trimmer joists rest (load bearing wall)?



Referenced code:
R802.9 Framing of openings.*Openings in roof and ceiling framing shall be framed with header and trimmer joists. When the header joist span does not exceed 4 feet (1219 mm), the header joist may be a single member the same size as the ceiling joist or rafter. Single trimmer joists may be used to carry a single header joist that is located within 3 feet (914 mm) of the trimmer joist bearing. When the header joist span exceeds 4 feet (1219 mm), the trimmer joists and the header joist shall be doubled and of sufficient cross section to support the ceiling joists or rafter framing into the header.*Approved*hangers shall be used for the header joist to trimmer joist connections when the header joist span exceeds 6 feet (1829 mm). Tail joists over 12 feet (3658 mm) long 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).
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Old 04-13-2013, 03:51 PM   #2
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Framing of opening in ceiling


trimmer joist bearing is that point where the trimmer sits on top of a wall. if your header is within 3 feet of the trimmer bearing point and not wider than 4' then a single trimmer (joist that the header connects to) will be fine for the header to connect to.

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