2308.7.12 Roof planking.
BC § 2308.7.12
Planking shall be designed in accordance with the general provisions of this code. In lieu of such design, 2-inch (51 mm) tongue-and-groove planking is permitted in accordance with Table 2308.7.12. Joints in such planking are permitted to be randomly spaced, provided the system is applied to not less than three continuous spans, planks are center matched and end matched or splined, each plank bears on at least one support, and joints are separated by not less than 24 inches (610 mm) in adjacent pieces. Table 2308.7.12Allowable Spans for 2-Inch Tongue-and-Groove Decking Span a(feet)Live Load(pounds per square foot)Deflection LimitBendingStress (f)(pounds per square inch)Modulus of Elasticity (E)(pounds per square inch)Span a(feet)Live Load(pounds per square foot)Deflection LimitBendingStress (f)(pounds per square inch)Modulus of Elasticity (E)(pounds per square inch)Roofs4201/2401/360160170,000256,000301/2401/360210256,000384,000401/2401/360270340,000512,0004.5201/2401/360200242,000305,000301/2401/360270363,000405,000401/2401/360350484,000725,0005.0201/2401/360250332,000500,000301/2401/360330495,000742,000401/2401/360420660,0001,000,0005.5201/2401/360300442,000660,000301/2401/360400662,000998,000401/2401/360500884,0001,330,0006.0201/2401/360360575,000862,000301/2401/360480862,0001,295,000401/2401/3606001,150,0001,730,0006.5201/2401/360420595,000892,000301/2401/360560892,0001,340,000401/2401/3607001,190,0001,730,0007.0201/2401/360490910,0001,360,000301/2401/3606501,370,0002,000,000401/2401/3608101,820,0002,725,0007.5201/2401/3605601,125,0001,685,000301/2401/3607501,685,0002,530,000401/2401/3609302,250,0003,380,0008.0201/2401/3606401,360,0002,040,000301/2401/3608502,040,0003,060,000Floors44.55.0401/3608409501,0601,000,0001,300,0001,600,000 For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kN/m 2 , 1 pound per square inch = 0.00689 N/mm 2 . a. Spans are based on simple beam action with 10 pounds per square foot dead load and provisions for a 300-pound concentrated load on a 12-inch width of decking. Random layup is permitted in accordance with the provisions of Section 2308.7.12. Lumber thickness is 1 1/2 inches actual. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.
