![]() ![]() For more information about glued laminated timber, contact APA – The Engineered Wood Associationor the Pacific Coast Lumber Inspection Bureau.When you choose Trus Joist, you're choosing the brand that: The majority of stock glulam timber is manufactured with camber, but some stock members – especially balanced layup combinations – are manufactured without camber. An appropriate balanced beam combination, such as 24FV5, may be used for either simple-span or continuous span applications. A strength reduction occurs if an unbalanced glued laminated timber is installed upside down, or in a continuous span across supports. This means there is a distinct top and bottom to the glued laminated header or beam.Īll unbalanced glued laminated timber stock beams are required to have a “TOP” mark and must only be used with the “TOP” mark facing up. Glulam timber is available in a variety of standard widths and depths, strength combinations, unbalanced or balanced beam layups, cambered or non-cambered beams, four different appearance grades, and stock or custom members.Ĭommon glulam timber combinations use an unbalanced layup of laminating lumber grades. In general, glued laminated timber headers and beams are stock items that can be purchased from a local building material supplier. This reduction results in an equivalent balanced Design Roof Snow Load of 0.70 times the ground snow load, with a required minimum of 20 psf (pounds per square foot), when using the following factors: The design roof snow load has been derived by reducing the ground snow load listed in each table heading in accordance with the provisions of Section 7.3 in ASCE 7-10, Minimum Design Loads for Buildings and Other Structures. The headers and beams in the snow load size selection tables (Tables 1-4, 7-10 and 15-18) have been sized using the design roof snow load shown in the subheading for each table. Roof live load reductions have not been taken in developing these tables. Wind and seismic analysis are outside the scope of this publication. The range of loads provided accommodates the most common design loads used in the United States, but only gravity loads (i.e., live loads, ground snow loads and dead loads) were considered. ![]() The 38 tables below provide size selections for various beam spans and loading combinations for Southern Pine dimension lumber and Southern Pine glued laminated timber and are available for the following applications:Īssumed loading conditions are clearly stated in the heading for each size selection table. Values tabulated represent the most limiting of four design parameters – bending (flexure), deflection, compression perpendicular-to-grain, and shear parallel-to-grain (horizontal shear). For the allowable load tables, users must determine the load in pounds per lineal foot (plf) the header or beam is required to carry.īeam sizes or allowable load capacities have been determined using standard engineering formulas for beams supporting uniformly distributed loads. ![]() For the size selection tables, users must determine the required load conditions, clear opening, and span of the trusses or other members framing into the header or beam. These tables are ideal for professionals who have – and will apply – the required technical knowledge. The Southern Forest Products Association’s span tables for Southern Pine headers and beams provides an easy method for selecting the proper Southern Pine header or beam for its intended application, including size selection and allowable load tables for southern pine lumber and glued laminated timber (glulam) headers and beams.
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