Roof Design Load Tables

Chapter 3 design loads for residential buildings it should also be noted that the wind load factor of 1 5 in table 3 1 used for load and resistant factor design is consistent with traditional wind design.

Roof design load tables.

Ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave condition where soil under footing freezes and exerts upward movement on the foundation bottom of footings must be below frost depth to avoid this issue commonly 12 inches in the charlotte and. Results are output in a convenient downloadable pdf. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load. Framing table for maximum roof rafter spans.

The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. The load increases with the use of heavier roofing material. Depending on your region you may need to design for a maximum snow load of anything between zero to 65 pounds per square foot or roughly 0 3 kpa. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Used but they typically defined the load cases or combination stress or strength limits and deflection limits. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Simply input your project data and our tool will customize your load tables or diaphragm designs from among more than 73 000 permutations.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Our new interactive deck tools provide the fastest way to generate your load tables and diaphragm designs for roof composite and form deck. Roof live loads largest roof loads typically caused by repair and maintenance pitch rise span lr 20 r1r2 12 lr 20 lr horizontal projection roof live load 16 r 1 r 2 live load reduction factors r 1 accounts for size of tributary area of roof column a t r 2 effect of the roof rise. Your feedback is welcome leading the way in steel deck innovation is dependent upon your feedback.

We invite architects engineers building owners and all members of the building design and construction industry to reach out to asc steel deck.