For residential living-area floor framing eligible for the conventional provisions of 2021 IBC Section 2308, use Table 2308.4.2.1(2) with 40 psf live load and an L/360 deflection limit. No. 2 Southern Pine joists are spaced 16 inches on center with 10 psf dead load. Which is the smallest listed nominal size that permits a 14-foot span?

ICC B2 exam practice question · Floor Construction

For residential living-area floor framing eligible for the conventional provisions of 2021 IBC Section 2308, use Table 2308.4.2.1(2) with 40 psf live load and an L/360 deflection limit. No. 2 Southern Pine joists are spaced 16 inches on center with 10 psf dead load. Which is the smallest listed nominal size that permits a 14-foot span?

A2x6
B2x8
2x10
D2x12

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 specified row gives 9 feet 4 inches for 2x6, 11 feet 10 inches for 2x8, 14 feet for 2x10 and 16 feet 6 inches for 2x12. The smallest sufficient size is 2x10. This wood-joist selection uses the IBC wood span table, not the ACI structural-concrete code. Source: 2021 IBC 2308.4.2.1 and Table 2308.4.2.1(2), p. 23-38; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

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