The loading condition is 40 psf live and 10 psf dead
| Minimum Solid Beam Sizes - 40 psf Live, 10 psf Dead Pressure Treated H/fir #2 or better (group x Douglas Fir & S. Pine) | ||
|---|---|---|
| Joist Span | Space between Posts in Feet | |
| 7 ft | 4x6 | 4x8 |
| 8 ft | 4x6 | 4x10 |
| 9 ft | 4x6 | 4x10 |
.
Consequently, how much weight can a 2x12 header support?
One 2x12 can support about 180 lbs. per foot or about 2,100 lbs.
Subsequently, question is, what size header is needed for a 12 foot span? Figure B: Example of Calculating Header Size
| Header Size | Maximum Span | Number of Trimmers |
|---|---|---|
| Double 2×6 | 4 ft., 0 in. | One |
| Double 2×8 | 5 ft., 0 in. | Two |
| Double 2×10 | 6 ft., 2 in. | Two |
| Double 2×12 | 7 ft., 1 in. | Two |
In this regard, how far can you span a header?
Take the example of a first-floor 3-foot 2-inch header in a two-story 26-foot-wide house with a center bearing wall. A single-ply 9-inch-tall box header is good for up to a 4-foot span, and a 15-inch-tall box header works for spans up to 5 feet.
What size lumber can span 20 feet?
Re: 20 foot clearspan beam size In that case, you need something like a 12-16" GLULAM or LVL to span the 20' and can use simple 2x8-10 dimensional lumber 16"OC as floor joists.
Related Question Answers
How far can a 2x12 span without support?
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.
How do you size a load bearing beam?
The formula for the section modulus is beam width times beam depth squared divided by 6. A two 2-by-6 standard beam has actual dimensions of 1.5-by-5.5 inches which would give a section modulus of 1.5 x 5.5 x 5.5 / 6 = 7.6 which is not enough for this example. A 2-by-8 beam would be sufficient.
