Many pole barns are built with trusses 8′ on center. Posts are typically 8′ on center as well. This allows us to place the trusses directly on top of the posts, transferring the roof and snow loads directly to the ground. However, we also construct buildings with trusses 4′ or 2′ on center. The choice is dependent on use and truss loads.
If a ceiling will be installed in a pole barn down the road, it’s sure easier to install trusses 4′ on center now so there is something to attach the ceiling to every 4′ rather than having to frame in between 8′ trusses first. Most homes or buildings with finished space have trusses 2′ on center to carry the loads.
Photo of a truss sytem in a Barndominium, built by Durabarn.
Pole barn trusses, built by durabarn.