Use 2021 IBC Table 2304.8(3) for wood structural floor panels at least 24 inches wide, continuous over at least two spans, with the strength axis perpendicular to supports and panel edges blocked. The uniform floor load is 50 psf, and no finish-floor span-increase exception is used. For single-floor-grade panels bearing a 16 o.c. span rating on supports spaced 16 inches on center, what is the smallest thickness listed for that rating?
- A3/8 inch
- B7/16 inch
- 1/2 inch
- D1 1/4 inches
Where to look it up
https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf
Why C is correct
The single-floor 16 o.c. row lists 1/2, 19/32 and 5/8 inch thicknesses. The smallest listed is 1/2 inch. The panel grade, rating, loading and support conditions govern this lookup; the depth of the supporting joist does not establish a universal 1 1/4-inch panel requirement. Source: 2021 IBC 2304.8.1 and Table 2304.8(3), including footnotes a, c and g, p. 23-12; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf