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R802.1.1 [IRC R802.1] Identification
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Load-bearing dimension lumber for rafters, trusses and ceiling joists shall be identified by a grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with DOC PS 20. In lieu of a grade mark, a certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted.
R802.1.1.1 [IRC R802.1.1] Blocking
Blocking shall be a minimum of utility grade lumber.
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