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http://www.the-house-plans-guide.com/beam-span-tables.html
Designing with Floor Beam Span Tables ... You will see that a 4-ply, 2 X 12 can span a maximum of 13' while supporting 12' joists on either side of it. Where to Find Tables. ... Therefore a post to support this built-up floor beam will need to be 6" by 6". Framers generally nail together several pieces of dimensional lumber to create such posts.
https://www.decks.com/how-to/40/beam-span-chart-table
When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Dimensional Lumber Deck Beam Span Chart . The numbers in gray indicate the distance between the support posts.
https://www.homedepot.com/p/4-in-x-12-in-x-20-ft-Prime-1-Douglas-Fir-Lumber-139854/202083023
No. Overtime the 4 x 12 x 20 DF will warp. a 4 x 4 support is needed at the mid point. I am not an engineer, but my upstairs outer deck beam has a noticeable dip in it. Some how I failed to install the 4 x 4 at mid point even though it is called out in the plans.
https://www.answers.com/Q/What_is_the_maximum_span_on_a_double_2x12_beam_supporting_a_2nd_floor_load_with_no_roof_load
Dec 13, 2008 · The actual size of a 2 x 12 floor joist is? It will vary a bit depending on age of the building. Old rough sawn are 2x12, new ones are 1 1/2 by 11 1/2 with 1/8 inch variation either way on the width.
https://www.hunker.com/12484662/how-to-calculate-load-bearing-beams
Calculate the maximum bending moment for the wooden beams. The bending moment is the length of the span times the weight to be supported divided by 8. For a beam spanning a 12-foot room and supporting a weight of 600 lbs., the maximum bending moment would be 12 x 600/8 = 900 foot-pounds.
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