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Tables 2, 3, 8 and 9 provide allowable loads for glulam beams used as simple span roof members for non‑snow loads (DOL factor = 1.25) and in snow load areas (DOL factor = 1.15).
Use these simple calculators to size Trus Joist TimberStrand LSL, Parallam PSL and Microllam LVL beams and headers. Select the application below you are looking to calculate. Calculators are for use in U.S. applications only.
Calculate the allowable span distance for your LVL beam based on the load requirements. Input the beam dimensions and load specifications to find out how far apart you can space your beams for optimal support.
Beam sizes are based on residential floor loading of 40 PSF live load and 10 PSF dead load. The roof framing must be trusses supported at the exterior walls only. Deflection is limited to L/360 at live load and L/240 at total load.
Select a Metwood beam to carry 400 PLF live load + 400 PLF dead load floor loading, spanning 20’, with a Live Load Deflection of L/360. Adding 400 PLF Live Load and 400 PLF Dead Load gives a total load of 800 PLF. Determine if width or depth is a factor.
n apply to bot. sides of a3-member beam.16d box nails = 0.135” diameter x 3.5” length, 16d sinker nails = 0.148”. iameter x 3.25” length.Beams wider than 7" must be designed. the engineer of record. All values in these tables may be increased by 15% for snow-load roofs and by 25% for non-snow load roofs wher.
Beam Span: B1 (ft) Table F, Girder Sizes Live Load, psf Beam Span, B1 (ft) Table G to G45 Design Criteria - Dead Load includes system self weight (slab + steel) - Superimposed dead load = 20 psf (roofing systems + MEP) - Loads are uniformly distributed over bay area - 3 in. metal roof decking
