A structural ridge beam is a horizontal beam placed at the peak or ridge of a roof and is designed to carry much of the live and dead loads or weight of the roof structure by itself.
Steel ridge beam roof construction.
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The loads on the ridge beam are carried by vertical posts at the beam ends down through the building structural walls to the building foundation.
A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to.
Construction beams are horizontal weight bearing supports that bridge an area.
The tables below give maximum spans for rafters and beams.
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The figures are based on quality materials.
For most residential construction today lvl laminated veneer lumber type beams are used for a structural ridge beam.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
However a beam built up assembled from sawn lumber can also be designed.
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In homes you ll find beams in walls floors ceilings roofs decks and garages.
Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12.
Timber steel framing manual single span ridge beam.
Along with posts and columns which are the beams vertical counterparts they support the structural integrity of all sorts of buildings.
For the example above uniform gravity load to be resisted by ridge beam is 160 plf dead load plus 320 plf snow load.
Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.
Structures that use steel roof beam construction usually have flat roofs but some smaller structures may have a peaked roof.
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.
Built up roof beams you will need a roof beam as a nailing surface to support the rafters.
Once again you will need to look at your local charts and use your local snow load factor to determine the maximum span for a given wood rafter size.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
