Bedrooms and habitable attic floors L/360 & 30 psf, Attic floors with limited storage L/240 & 10 psf. There are a number of different types of load than can act upon a structure, the nature of which will vary according to design, location, and so on. 0000000016 00000 n After determining what size lumber to use, turn to the tables in Design Values For Joists and Rafters to select a species and grade that meets the required Fb and E values. ASCE Revision Calendar. Typical Design Dead Loads 2 Table 1. C24 . I find the AWC documents easy to follow. Dead Loads, cont’d Typical Weights of Horizontal Systems •Roof Construction –Asphalt Shingles ~ 15 psf (pounds per sq. •Dead Load •Live Load •Cold Weather Load •Soil Load •Wind Load •Earthquake Load –Not required in NC for typical residential home. There are other span tables and publications available too. 2 2x12 works. this translates into a uniform load of 640 plf across 2.5 ft of the EC1-1-3 Figure 5.2 Figure S. 4.1: Snow load shape coefficients for monopitch roofs . 0000012242 00000 n EC1-1-3 Figure NA.1 Figure S. 3.1: Characteristic ground snow load map for the UK and Ireland . When the imposed load is considered as an accompanying action, in accordance with EN 1990, only one of the two factors Ψ (EN 1990, Table … ASCE 7 | 2021 Revision. The house acts as a structural system resisting dead loads (weight of materials), live loads (weights imposed by use and occupancy), like snow loads and wind loads. Many factors influence how a system responds to loading. x�b```f``Qb`e`�-eb@ !��.f�u�XU#���V���ms��.�̾s2B9#7�e���N���'��6ie�~Q����%�bɭ^Χ3���:��0/�EG9���Zs�o�}+t��MQ�� 1N��A04�� OPи�$̤�cR� QJ`RPХ�Ӂ@7v� -Ė`sU��� 9��4@�.f�I��n�-̟Y쓟0X�`���������X5v2��L Dead loads - Designing Buildings Wiki - Share your construction industry knowledge. 43. If your code book says your snow load is 40 psf, then you use the 40 psf live load rafter table. For this, use the tables in Design Values for Joists and Rafters. 2 2x10 or 2x12 would do the job. The loads carried by floor joists, ceiling joists, and rafters are transferred through their end points to supporting walls and beams. Snow loading. Well every building load has an equal "reaction load". When sizing joists, use the clear span - the length from support to support - not the full length of the joist. per sq. Loads should be further adjusted for application conditions using Table 5. In other words, the weight is distributed or shared uniformly by the members in the floor or roof system. In the example, the joists have a spacing of 16 inches and a span of 11 feet, 2 inches. They are expressed as a fraction; clear span in inches (L) over a given number. Roof Truss Span Tables Alpine Engineered Products 15 Top Chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 Bottom Chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2/12 24 24 33 27 27 37 31 31 43 33 33 46 2.5/12 29 29 39 33 33 45 37 38 52 39 40 55 3/12 34 34 46 37 39 53 40 44 60 43 46 64 3.5/12 39 39 53 41 44 61 44 50 65 47 52 70 4/12 41 43 59 43 49 64 46 56 69 49 57 74 5/12 44 52 … Step 4 Bearing Check: The final step is to make sure the lumber you've chosen meets the required design value for compression perpendicular to the grain. A higher grade of a given species has a higher strength rating (Fb) and often has a higher stiffness value (E) too. Floor Dead Load Calculation : Carpet & Pad : 3.00: psf: Conc o/ stl deck : 35.00: psf: Joists : wt/ft : 16.00: plf : spacing: 5.83: ft : Jst Wt : 2.74: psf: Ceiling : 1.80: psf: Misc : 1.46: psf: Total Unit Weight : 44: psf: Note that this calculation does not include the weight of any girders or other structure that is in the floor system. In other words, how much a joist or rafter bends under the maximum expected load. 0000026480 00000 n Dead load of partitions = 20 lbs. Example, the weight is distributed or shared uniformly by the members in the floor or roof.. Tables give details of the same grade and species of lumber for the most current load,! Where possible, the code provides span tables for joists for flat roofs ceiling... The top and bottom surfaces are stressed more than 0.50 kN/m2 = 3.27m rafters to bend bottom edge wind should... That snow loads from the inside surface of the table of contents indicates that table F-2 these! 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