The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1 (1), or APA E30.
2019 California Residential Code. Chapter 8, Roof-Ceiling Construction. Section R803, Roof sheathing. R803.2.2 Allowable spans. Table R503.2.1.1(1) Allowable spans and loads for wood structural panels for roof and subfloor sheathing and combination subfloor underlayment.