Deck Roof Beam Span

For the initial calculation f can be estimated at 1 000.

Deck roof beam span. Check with your local code official or simply drop back to the shorter value in the table and assume the allowable span is 7 7. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Obviously the larger the beam the greater the distance it can span between posts. When building a deck with 7 ft.

Long the beam can span 7 7. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches. Fill in the parts of the formula that are already known. In the example the beam spans the 10 foot width of the roof.

Beam span calculator for help simply click on the beside the section you need help with watch this tutorial video. When the deck joists are 8 ft. L stands for the span of the beam in feet. F stands for the beam s fiber strength in bending which depends on the species of wood.

A double 2x12 beam can span 12 feet. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. For example a two by twelve douglas fir beam supporting joists that span 8 feet must be supported by posts that are no further than 13 feet 9 inches apart while a southern yellow pine beam of. Lumber species southern pine douglas fir douglas fir larch hemlock fir spruce pine fir redwood western cedar ponderosa pine red pine.

Dimensional lumber deck beam span chart. Maximum allowable spans for wood deck beams as shown in figure r507 6 shall be in accordance with table r507 6 beam plies shall be fastened with two rows of 10d 3 inch 0 128 inch nails minimum at 16 inches 406 mm on center along each edge. 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. A redwood 4x6 beam should span no more than 6 between supporting posts.

Joists you know the beam can span somewhere between 7 7 and 8 0 but you don t know exactly where. A 2 2x10 can span 10 feet and so on. 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. Home building a deck deck beam.