A table of roof material weights including sheathing, insulation, and other decking materials. The shapes and spans shown here represent only a fraction of the millions of designs produced by Alpine engineers. (Usually 30 lbs. ft.) Dead load of roof of wood shingle construction = 10 lbs. View Allowable Load Tables. The weight of the landscaping materials shall be considered as dead load and shall be computed on the basis of saturation of the soil. Toggle navigation. Typical Unit Area Dead Load Calculations. Use this table to determine the maximum lengths of floor joists based on species of lumber, joist spacing, and joist size. Joist span Bridging Girder load width Half joist span Live load on roof = local requirements for wind and snow. CONTACT (210) 650-2276; Pole Barns » Roof Trusses » Roof Material Weight Roof Material Dead Load Table. Disclaimer: These easy-to-use tables were compiled by the Southern Forest Products Association (SFPA) as a service to design/build professionals and other Southern Pine users. Reference design values are for normal load duration under the moisture service conditions specified. span, configuration and load conditions. per sq. Dead Loads, cont’d Typical Weights of Horizontal Systems •Roof Construction –Asphalt Shingles ~ 15 psf (pounds per sq. Dead Load Weight of Roof Trusses Top Chord Bottom Chord Webs Weight per Lineal Foot (plf) 2x4 2x4 2x4 4.3 2x4 2x8 2x4 5.6 2x6 2x4 2x4 4.8 2x6 2x6 2x4 5.5 (TABLE 2308.8(2)) RAFTER SLOPE 2X6 2X8 2X10 Dead Load (up to 10 psf) Live Load: 40 psf ALLOWABLE SPANS FOR DF#1 FLOOR GIRDERS (DF-LARCH) 2X8 2X10 2X12 2X6 4:12 7'-3" HEADER SPANS FOR DF EXTERIOR BEARING WALLS BASED ON 28' BUILDING WIDTH (TABLE 2308.9.5) 4'-8" 5'-11" 3:12 20 16 5:12 16 4x6 4x8 4x10 4x12 Max. Roof Rafter Span Use this table to determine the maximum lengths of roof rafters based on species and grade of lumber, spacing, dimensions, load, and slope. Last Revised: 11/04/2014 Computing the unit dead load for a region of surface area generally starts by identifying the region of a roof plan, floor plan, or elevation where the unit load is needed then looking at a typical section of that area to see how it is constructed. per sq. ft. Section 3.2. Since it is possible to use the attic for storage, the live load of the attic floor is set at 20 psf according to code. Where roofs utilize a green roof system and are used for human occupancy, the minimum live load shall be as specified in Table 1607.1 or Section 1607.11.2.2, whichever is greater. Load Charts Load Charts With A Built-In Safety Factor We believe that engineered wood products such as structural insulated panels (SIPs) cannot be understood unless full-scale, destructive testing is performed to obtain absolute values. 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