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3-13. Roof Openings

Major roof openings are those that interrupt the normal run of rafters or other roof framing. Such openings may be for ventilation, chimneys, trap-door passage, skylight, or dormer windows. Roof openings are framed by headers and trimmers. Double headers are used at right angles to the rafters, which are set into the headers in the same way as joists in floor-opening construction. Trimmers are actually double rafter construction in roof openings. Nailing steps may be added if needed. Figure 3-32 shows roof-opening construction.

Figure 3-32. Roof opening

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