How far can porch beams span?
The smallest beams for patio covers are typically 4-by-6. In general, the maximum span for a 4-by-6 beam is 6 feet between 4-by-4 posts. If you move up to 4-by-8, you’re usually allowed to span up to 10 feet between posts. A 4-by-10 can usually span up to 12 feet between posts.
What size beam will span 10 feet?
A double ply beam can span in feet if there is no overhang beyond it. A double 2×12 beam can span 12 feet, a double 2×10 can span 10 feet, and so on.
How do you size a porch beam?
How to Size a Beam to Hold a Porch Roof
- Determine the load per square foot that the roof must support.
- Multiply the load per square foot by the total area of the roof.
- Divide the total load according to how many supporting beams the roof will have.
- Write down the beam strength formula: Total load in pounds = FBd^2 / 9L.
How far apart should beams be?
The typical range for ceiling beam spacing is anywhere between two feet apart from one another up to eight feet apart. The most common ceiling beam spacing is four feet apart. Shorter spacing will give your ceiling an attractive patterned look, creating a real focal point.
How do I calculate beam size?
Measure the distance in inches that you need the steel beam to fill. Write this figure down on a sheet of paper as your clear span for the beam. Measure the length in inches of the floor joist that the I-beam must support. Divide that number by two.
What size beam do I need for a 12 foot span?
If the span of the beam is 12 feet, then the depth of the beam will be 12 inches, beam depth taken as 12″ and beam width 12/1.5=8, taking as 9″. What size beam do I need for a 10 to 12 foot span? What size beam do I need for a 24 foot span?
What are the different sizes of beam span tables?
There are several beam span tables for all the species of wood. This table is simply a sample and may not be valid for your region. This span table excerpt shows two possible sizes of built-up floor beams (2 X 10 and 2 X 12).
What is the maximum span for a patio roof?
In areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). For heavy roofs or in areas with substantial snowfall or winds, call your local building department for code requirements. The tables below give maximum spans for rafters and beams. The figures are based on quality materials.