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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.
However a beam built up assembled from sawn lumber can also be designed.
For most residential construction today lvl laminated veneer lumber type beams are used for a structural ridge beam.
February 1 2020.
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.
Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.
In homes you ll find beams in walls floors ceilings roofs decks and garages.
The tables below give maximum spans for rafters and beams.
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A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to.
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.
Along with posts and columns which are the beams vertical counterparts they support the structural integrity of all sorts of buildings.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
For the example above uniform gravity load to be resisted by ridge beam is 160 plf dead load plus 320 plf snow load.
Built up roof beams you will need a roof beam as a nailing surface to support the rafters.
Typically the roof beam is made by nailing together a few pieces of dimensional lumber.
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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.
Structures that use steel roof beam construction usually have flat roofs but some smaller structures may have a peaked roof.
Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12.
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