how would go about useing 3 2x6s instead of 1 6x6 for building a pole barn?

Question

i want to put treated in the ground and use non treated the rest of the way up it will be a 12ft high ploe barn

Answer 1

First you need to establish the level of treatment in the 2x6's. If they are not treated to a .25 or .40 level they will rot in the ground. The 6x6 will be treated to a .40 level as this is the most common application. Do not use anything less than .25 for ground contact. This can be determined by the tag that is attached to the end of the lumber. If you are satisfied that the lumber is sufficently treated, then just take the boards and lay them one at a time on top of each other and screw them together with exterior deck screws. You can make them stronger by applying exterior construction adhesive between each of the boards and drilling through all three of them and bolting them together with galvanized carraige bolts. If the building walls are to be 12 foot in height, you will need at least 16' post to give you enough height to put them 3' in the ground and still have some adjustment room for any differiences in grade. Cement the post with quikrete concrete mix or you can use pea gravel and tamp it tightly in the holes tightly

Answer 2

If this built-up post will be used in a non-living structure such as an agricultural barn or warehouse, you can probably get away with the concept. But if this will be used in a residential structure, you should work with an architect or structural engineer to properly design a built-up post to meet your structure's design requirements.

A few basics: a 2x6 is actually 1.5 x 5.5 inches while a 6x6 is 5.5 x 5.5 inches. Therefore, a built-up post made using 2x6s will actually be 4.5x5.5 inches - a full 1 inch narrower than a 6x6 post.

A 6x6 post, 12 feet long, in Douglas Fir, has a vertical load capacity of 17,586 lbs. A 4x6 (3.5x5.5) has a capacity of 6,222 lbs. I cannot find the vertical load capacity for a single 2x6, but it's probably less than half of 6222 - perhaps 2,500 lbs. So a built-up post of 3 pcs of 2x6 might have only a 7,500 lb capacity.

I do not think that bolting or gluing several 2x6 pieces together will increase the vertical loading much beyond the sum of the individual 2x6 boards. You might want to use 4 pcs of 2x6 to achieve a more substantial vertical load capacity.

Concerning assembly, you should use 1/2" diameter bolts, washers and nuts, vertically every 12 inches. Keep the drilled holes at least 6 inches away from the end of any board. Finally, stagger the 2x6 joints at least 18 or 24 inches apart, so that there are no 2x6 joints adjacent to each other.

Construction adhesive may provide some limited improvement - but only providing 'peel' strength, not 'shear' strength. (Peel strength is like pulling masking tape off a window. Sheer strength is tearing the wood across the grain of the board.)

Good luck

Answer 3

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Answer 4

It takes more than some nails and 2x6's to make a laminated column. Columns can usually be ordered from you materials supplier. If you want to do it yourself there are some things to consider. Will the building be build with poles in the ground which requires the column to start out treated at the bottom. It should also be verified that the treated lumber be of a .60 retention for below ground use. This is usually not what is stocked at most yards. The nails used in the column should be stainless steel as well or at least coated for ACQ lumber. If the building will be built on a slab with brackets you won't have the concerns about treated lumber but it requires serious brackets and is not as strong as poles in the ground. Which ever you choose the columns will be between 18 and 22 feet long on the sides and longer on the gables for a 16' sidewall so be sure to stagger the joints on the rows of 2x6's so as not to create a weak point. If you still have any questions I can get you some more specific literature

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Answer 5

You can use three 2x6's in stead of one 6x6 to build a pole barn, by bolting the three together. The three bolted together will be stronger than one 6x6. When they bolt the three together they offset the distance where they are bolted together. So one board may end at 6 feet, the other at 8 feet and the last at 10. It would be stronger though if you you ran the 2x6's the entire length though and had them be totally treated. It would make the barn more structurally sound. Or you could anchor the bases to concrete pilings.

Answer 6

I don't know what the plan for the barn is. You may be OK.

However, having done the structural calcs for several pole barns, I caution you to NOT do this. Typically, the poles and the footings provide the resistance for not only the vertical roof loads, but ALSO the lateral wind loads.

For lateral loading, the pole and footing are modeled as a uniformly loaded vertical cantilevered beam. The maximum moment (twisting force) occurs right at the footing daylignt/beam interface. Thus to try to connect another member at that location is futile. The labor and materials to try and do that for each pole would be prohibitive.

The built up column you want to construct will be OK for the roof loading but NOT OK for the lateral load resistance. There is no efficient way to glue and screw or even bolt a moment connection.

I like the telephone pole idea. The holes for the posts would have to be bigger, but you could double the height, easy.

Answer 7

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Answer 9

When I sold lumber for ground contact we sold .060 CCA, We sold pole barns and built the hell out them on the plains of Colorado. The guys would use Doug Fir for structural pieces, but for your strongbarn nail boards SPF is good enough.. And truthfully 2'OC running horizontals from 2' to the bottom chord of your trusses. For your vertical supports I don't believe it recommended to use laminated 2x for your verticals. You can check with your lumberyard, they can make the recommendation. If the problem is price points look for old telephone poles.

Answer 10

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