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How Much Weight Can A 4x8 Or 6x8 Timber At 16 Feet Long Hold For A Load Being Used As A Cross Member Support Beam?

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russell cardwell Profile
russell cardwell answered
Depends on the psi rating of the lumber.a 1200 psi bending stress rating is a live load of 40 pounds per square ft.
thanked the writer.
Anonymous
Anonymous commented
In order to answer your question, we need the length, width and height of the beam, the location of loads (and if they're evenly distributed or at certain points), the duty cycle of the loads (short term, long term, with snow or some type of temporary high loading situation), and we need to know the type of wood and the wood grade as well.

Different species and lumber grades change how much a beam can handle to be within maximum fiber stress. The stress depends largely on the length of a beam, and it's cross section size (modulus), the species and where the loads are located. A "select structural" douglas fir beam, for example, can handle about one and a half times as much stress as a Grade 2 beam.
Anonymous
Anonymous commented
here's a good discussion of beam sizing:
http://www.hammerzone.com/archives/framecarp/repair/porch/beam13/replace.htm#Bad
vijanti DHANJI Profile
vijanti DHANJI answered
The timber which is 4x6 or 4x8 can approximately hold up to a large arrange and can carry it off for sometime.

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