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Re: 3Xs at Abutting Panel Edges

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Strictly speaking the two-2x panel edge member does not strictly meet the code without action by the building official.  However, there is Section CBC 104.2.8 "Alternate materials, alternate design and methods of construction."  which states:
"The provisions of this code are not intended to prevent the use of any material, alternate design or method of construction not specifically prescribed by this code, provided any alternate has been approved and its use authorized by the building official.
The building official may approve any such alternate, provided the building official finds that the proposed design is satisfactory and complies with the provisions of this code and taht the material, method or work offered is, for the purpose intended, at least the equivalent of that prescribed in this code in suitability, strength, effectiveness, fire resistance, durability, safety and sanitation.
The building official shall require that sufficient evidence or proof be submitted to substantiate any claims that may be made regarding its use. The details of any action granting approval of an alternate shall be recorded and entered in the files of the code enforcement agency."
My experience in using details similar to what you are proposing in retrofit construction, where it is difficult to replace studs without damaging finishes, has been that they are easily accepted by building officials by simply providing a copy of the APA report with the design submittal and asking that the detail be accepted.  In several cases, they have already been aware of the report.  In a couple of cases, they expressed appreciation for receiving the report because they are frequently asked to approve this type of construction for retrofits.
Bill Cain, S.E.
Berkeley  CA