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| Those poles are strong enough that they don't limit the spacing so much as the truss strength sets the pole spacing. Roof trusses can be made to be anything from a foot to 20 feet apart, but those strong enough for wind and snow loads on 20 foot centers are literally bridges and HEAVY. Then it almost takes trusses to span between the trusses to hold up the roofing. Most sheds are built with the trusses spaced 8 to 10 feet and so the posts holding truss ends are 8 to 10 feet apart and the trusses reach from wall to all anywhere from 30 to 100 feet. But design takes a good structural engineer and building the trusses takes care. The longer and stronger the trusses are the harder they are to put in place and the more expensive they are. Its probably a decent trade off to plan on 7 or 8' truss spacing and more poles because of the cost of stronger trusses. It might be practical to use flat topped trusses or just laminated beams like in side wall over wide doors to hold up trusses at closer spacings than the poles, but that takes away from the simplicity of pole construction.
An alternative to used poles can be made (my first building is built that way) by laminating 2x6. Use foundation grade for the parts in the ground, then overlap plain 2x6 splice joints above ground. Leave the center 2x6 short by the end height of the truss and rest the truss in there with sturdy through bolts and you get a very good truss to post connection, far better than bolting the truss to the side of a round pole. Underground use stainless steel nails to assemble the laminated posts. That was a Bonanza building, now owned by Lester. Another detail best detailed by an experienced structural engineer.
Gerald J. | |
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Telephone Pole building????
