Jun 28, 2013 / Pole Barn Question - OSB or not for Roof #31 P paulharvey Veteran Member Joined Nov 23, 2012 Messages 1,425 Location Hawthorne, FL Tractor Kubota L285 When I build a small school building with metal on plywood roof, metal company specced 43# roofing underlayment on top of the plywood/under metal. It is a very heavy asphalt felt paper with a sand on the top side.
When I build a small school building with metal on plywood roof, metal company specced 43# roofing underlayment on top of the plywood/under metal. It is a very heavy asphalt felt paper with a sand on the top side.