How far can a 2×12 pressure treated span? 
The answer to this question depends on how you define “far”. Anywhere from just a few feet, many miles or even hundreds of miles is possible.
The “can a 2×12 span 16 feet” is a question that I am unable to answer. However, this is not the only question about spans in my blog. Please check out the other questions and answers on my blog as well.
In general, 16inchoncenter joists may reach 1.5 times their depth in inches in feet. A 2×8 may be up to 12 feet long, a 2×10 can be up to 15 feet long, and a 2×12 can be up to 18 feet long.
How long can a 2×12 span without support in this case?
A double ply beam may span in feet a value equal to its depth in inches when supporting joists that span 12 feet with no overhang beyond the beam. A double 2×12 beam can span 12 feet, whereas a (2) 2×10 beam can span 10 feet, and so on.
As a result, the question is: how far can a 2×10 pergola span? When 6×6 posts are utilized, a 4×4 makes a fantastic knee brace. Also, a 2×10 can span 13’9″ when used as a deck joist, so I’m not sure why it couldn’t easily support 14 feet on a pergola, which would reduce the load by 75%.
As a result, how far can a triple 2×12 beam be span?
14 feet
What kind of wood can span a 20foot span?
60 lbs/ft2 (2873 N/m2) maximum live load
Maximum Length (ft – in)  

Nominal Dimensions (inches)  Center to Center Joist Spacing (inches)  Grade of Lumber 
2 x 12  24  13′ – 2″ 
2 x 14  12  20′ – 10″ 
16  18′ – 0″ 
Answers to Related Questions
What is the maximum span that a 2×8 beam can span without support?
In general, 16inchoncenter joists may reach 1.5 times their depth in inches in feet. A 2×8 may be up to 12 feet long, a 2×10 can be up to 15 feet long, and a 2×12 can be up to 18 feet long. The larger the deck, the larger the joists.
What is the maximum weight that a 2×12 can support?
For a 12′ span, one 2×12 can sustain around 180 lbs. each foot, or about 2,100 lbs. altogether.
Without support, how far can a 2×10 rafter span?
2 X 6 rafters spaced 16 inches on center (o.c.) may span a maximum distance of 13 feet 5 inches, according to the table. 2 X 8 rafters spaced 24 inches o.c. are another possibility.
How far may trusses span before they need to be supported?
Internal supports are not required for trusses that span 1015 meters or more.
What is the maximum weight that a 2×10 floor can support?
In fact, each 2×10 can hold up to 1,200 pounds. To be explicit, “clear spans” are used to quantify spans. To put it another way, from one face of support to the next. Also, if your BBQ is in the center of the span such that people can stand around it, the joists will be subjected to an extra “Live Load.”
What is the maximum weight that a 2×8 can support?
Some of it is rather technical, and it largely concerns pounds per square foot of loading. 2x6s are often utilized for ceiling joists, especially because you said 24 inches “only oc and very short spans (5 or 6 feet ). Most floor loads would be at least 2×8 @ 16 inches “oc and, if possible, 2×10.
What is the maximum span of a triple 2×6 beam?
For standard deck loads, a triple 2×6 beam over a 10′ width should be more than enough.
What is the best way to size a beam for a loadbearing wall?
The section modulus is calculated by dividing the beam width by the beam depth squared by 6. The actual dimensions of two 2by6 standard beams are 1.5by5.5 inches, giving a section modulus of 1.5 x 5.5 x 5.5 / 6 = 7.6, which is insufficient for this example. It would be sufficient to use a 2by8 beam.
Is it possible for me to span a double 2×8?
No, even doubled, standard timber cannot reach 23 feet. If you can locate such lengths, it’ll be as bouncy as a trampoline and won’t meet code. To cover that distance, you’ll need at least a 12″ (nominal) Ijoist or an engineered floor truss, or an LVL or steel beam in the middle.
What is the maximum span of a 6×12 beam?
The loading condition is 40 pounds per square foot live and 10 pounds per square foot dead.
Minimum Solid Beam Sizes – 40 psf Live, 10 psf Dead Pressure Treated H/fir #2 or better (group x Douglas Fir & S. Pine)  

Span of Joists  In feet, there is a space between the posts.  
11 ft  4×6  4×10 
12 ft  4×8  4×10 
13 ft  6×10  6×12 
How do you calculate the length of a beam?
Design a beam depth by dividing the span by 20 as a rule of thumb for calculating the depth of manufactured beams. 5 1/2 inches, 7 1/4 inches, 9 1/4 inches, 11 1/4 inches, 11 7/8 inches, 14 inches, 16 inches, 18 inches, and 20 inches are common beam depths.
How do you determine the size of a header beam?
How to Size Headers & Beams
 Choose a sort of wood depending on the amount of weight you’ll be carrying.
 To calculate the total load per foot per beam, use a span table.
 Choose the correct span from the options in the table.
 To view the capacity listing, scroll down the column of the lumber you’ve chosen.
 Double your beams for more planning and construction help.
Without support, how far can a 4×6 span?
The longer the beam’s spread between posts, the greater the distance it can traverse. Between supporting posts, a Redwood 4×6 beam should not span more than 6′.
What is the length of a pergola’s longest span?
“A span of 22 feet will not enough (for 2″ x 6″ beams). You’ll need at least three support posts, but four is preferable.” Whether you absolutely want a longer, unbroken pergola beam span, look into strengthened beams and vinyl pergolas to determine if either of these options is feasible.
What is the length of the longest wood beam?
The Forest Products Laboratory is investigating the world’s biggest wood beams (FPL). The glued laminated (glulam) beams were made of Douglasfir and each measured 72 feet long and weighted 6,000 pounds.
Why is my pergola swaying?
The wobbling seems to be coming from inside the anchor, mostly from the two open sides where the anchor does not wrap around the post. Things should be stable after securing the beams and rafters, as well as a pair of knee/ybraces to each corner, I reasoned.
What is the maximum weight capacity of a 2x12x20?
To work up the details, you’d need to do some math, but those 2×12’s would hold roughly 150 pounds per foot x length x spans, but then you’d be in mode of rupture or elastics, dead weight living weight.

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