Flat Roof Wooden Beam

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Flat roof wooden beam.

Structures that use steel roof beam construction usually have flat roofs but some smaller structures may have a peaked roof. Per square foot for northern areas of the u s. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. This is a completion video of a flat roof framing.

Calculate the weight the beam must support. Steel is cheaper than wood in most cases and it can handle a load much better but steel beams must usually be cut off site and trucked into a location whereas wood beams can readily be cut on site. Also available for the android os. Wooden beams attach atop the posts and rafters install between the beams.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting. After the roof is framed plywood sheathing is installed for the roofing.

In the warm flat roof construction there is insulation packed into every possible space where air can flow. This is a completion video of a flat roof framing. 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. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

For a flat roof with snow loading this is 25 lbs. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof.