: The International Residential Code (IRC) 502.8 covers regulations for cutting, drilling, and notching structural wood floor framing.
A Washington State Agricultural Survey Establishment Estimation report. (502.8 MB)
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R502.1.11 [IRC 502.8] Cutting, Drilling and Notching - UpCodes Drilling and Notching - UpCodes
, the number appears as a depth measurement for several base units.