For an interior load-bearing wall, my span charts show a max of 8' 1" for 2 Doug fir 2x12's in a house 20' wide, 7' in a house 28' wide, and 6' 3" in a house 36' wide. These all require two jack studs at each end.
As the table shows, no 2×8's meet the span and spacing requirements, but a 2×10 with an E of 1,300,000 psi and Fb of 1093 psi can span 15 feet 3 inches – more than enough. A 2×12 with an E of 800,000 psi and Fb of 790 psi also works, since it can span 15 feet and 10 inches.
Depending on the species and grade, each 2x12 will support about 120 lbs. per linear foot (plf) or both will support 120 plf x 2 = 240 plf. If it's a single load (point load) then it's about 2200 lbs. at the center of the span, or for 2, it's 2200 x 2 = 4400 lbs.
Header span - 10 feet. Total header height needs to be 12 inches. I will use two 2x4 jack studs that the header will rest upon. From what I have read I need to use sandwiched 2x10 for 10 foot span.
The rule of thumb is 4X the length plus one on the ground floor and plus two on higher floors. For example, a 6-wide window would require a 4 x 8 header on the ground floor and a 4 x 10 on upper floors. So a 20-foot span would require a 4 x 22, the nominal sizes of lumber may restrict you to a 4 X 24.
Of course, the plywood does add some strength, but for several reasons engineers almost never count on this strength in their designs. Only the layers of plywood with the grain oriented horizontally (parallel with the direction of the header) are really adding any strength.
A 4 ply 2x12 beam can span 20 feet, but it is important to consider the load that the beam will be supporting. If the load is too heavy, the beam may sag or even fail.
30 Feet is a long span (that's almost 10 meters) — assuming it is for a regular residential building, you will need a set of 4″X16″ logs spaced at 20″ minimum. Also, since 16″ deep logs are not easily available, you may have a wood fabricator do it for you; a messy, lengthy and expensive process.
For a span of 14 to 16 feet under typical residential loads, you might be looking at an LVL beam that's around 11-7/8" to 14" in depth and potentially doubled (two LVLs nailed together). This is a common practice to increase the strength of the beam for longer spans.
Hello, You will need (3)1.75"x16" Microllam LVLs to span the 14'-0" span. Due to the concentrated load in the center of the header, it increases the size of the beam (typically Microllam LVLs are the depth in inches that they span in feet.). You will need (2)2x4 jackstuds and (1)2x4 kingstud at each end.
The amount of laminated veneer lumber (LVL) required to span 25 feet will vary depending on the load it will sustain, the distance between supports, and the kind of wood used in the LVL.As a general rule, a minimum LVL size of 5 1/4" x 16" would be needed for a 25-foot span with an evenly distributed load of 40 pounds ...
In general, a 2″×6″ lumber may span from 10 to 15 feet, while a 2″×8″ lumber may span from 13 to 19 feet. Likewise, a 2″×10″ lumber may span from 16 to 23 feet, while a 2″×12″ lumber may span from 18 to 27 feet. In addition, the 2″×4″ lumber may span from 7 to 9 feet.
For a 2×12 made of Southern Yellow Pine with a span of 10 feet and a uniform load of 40 pounds per square foot (psf), the beam can typically hold about 3,000 pounds without excessive bending or deflection. This is assuming that the beam is installed with proper supports at either end.
Joist Size
For instance, doubling the thickness of the joist can increase the span by about 75 or even 100 percent. This means that while a 2x6 joist with 16-inch on center spacing may have a span of nine feet a 2x12 joist with 16-inch on center spacing will have a span of about 18 feet.
According to this joist span table the absolute maximum span you can get with a 2x12 is 13'10" assuming a 100PSF live load.
According to the LVL User's Guide, a 20-foot span with a 50-pound live load requires an LVL beam with a depth of at least 12 inches. The specific LVL beam that you need will depend on the grade of the LVL, but a common option is a 2x12 grade 300 LVL.
I-Joists are manufactured in a wide range of depths ranging from 9 ½″-24″ and can be special ordered in lengths as long as 60 feet. BCI Joists are available in standard depths up to 20″ and AJS joists are available in depths up to 24″.
While OSB can still be used in hail-prone areas, it may have a higher risk of surface damage and potential compromise compared to plywood. Plywood's superior impact resistance and structural stability make it the preferred choice for roofs in regions prone to hail and severe weather conditions.
In general a double 2x beam can support a span in feet equal to its nominal width in inches. A double 2x10 can thus span 10 feet.
The finish on your headers will determine how they look and how long they last. It will also affect the way they perform. There are several options available. Understanding the benefits and weaknesses of each one will help you make the right decision.