# How far can 3 2x12 span?

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civil engineering industry

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**feet**for a triple 2x12.

Also, 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.

**2x12 can support**about 180 lbs. per foot or about 2,100 lbs.

In this manner, 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.

25 feet