Pole barn roofing and ventilation

[Robert Engel]

Robert, with 4' spacing on the trusses, the amount of additional framing required to support "normal" batt-type insulation would be substantial, making closed cell spray foam on the bottom of the roofing material a bit more attractive in overall cost plus it adds substantial structural rigidity and air infiltration prevention.

Yeah, I was assuming he would install a ceiling.

[Jim Becker]

Yeah, I was assuming he would install a ceiling.

There are advantages to both open and with a ceiling...both functionally and cost-wise. Personally, I'd do the foam on the underside of the roof and keep the space open, although that has to be figured into heating/cooling cost, too.