Roof Load Beam Span

Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.

Roof load beam span.

50 psf x 14ft 700 pounds per lineal foot. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For the initial calculation f can be estimated at 1 000.

F stands for the beam s fiber strength in bending which depends on the species of wood. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Window door garage door headers supporting roof loads only. In the example the beam spans the 10 foot width of the roof.

It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. Standard 2 by 12 beams on 16 inch centers are used to span 15 feet. The total load is 4 000 pounds. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Window door garage door headers supporting roof wall floor loads. Fill in the parts of the formula that are already known. 15 psf x 14ft 210 pounds per lineal foot.