Bare Steel Sweats Every Cold Night
Foam fixes sweating steel by keeping the inside face of each sheet warm. On a clear winter night the roof radiates its heat to the sky and drops below the dew point. Any damp air inside, from livestock, hay or a propane heater, touches that steel and turns to water.
The drip lands on machinery, rusts screws and purlins and soaks whatever is stored below. A vapour retarder stapled under the steel tends to tear, flap and hold water against the sheet. The foam sticks to every rib, so no air pocket remains where damp could collect.
Sealing Around Posts, Girts And Doors
A foam job on a pole barn is only as good as its edges. We spray around each post, along the top and bottom of every girt and up into the peak. Along big sliding and overhead doors we trim the foam back so the doors still run and seal.
The ridge cap, the eave trim and the bottom of the walls let in most of the wind. Those spots get sealed first. If you plan to hang a liner or interior steel later, we can keep the foam flush with the girts to leave room for it.
How Thick Pole Barn Spray Foam Should Be
About two inches of closed cell foam stops drip in most cold storage pole barns. A heated building usually wants three or four inches on the roof and walls. We push a depth gauge in as we go and record the readings for you.
Foam in a heated building where people work usually needs a cover. The building department decides that, and we raise it on the first visit. The workshop foam page explains the cover options.
Pole Barn Spray Foam For Equipment And Hay Storage
Even a cold pole barn between Elmira and St. Clements holding a tractor, a combine or square bales gains from a thin coat of foam. Dry steel means less rust on equipment and less mould on feed. Plenty of Woolwich farms do the roof one year and the walls the next. For buildings that house animals, see our livestock barn foam page.
Spring Thaw Brings The Heaviest Drip
Pole barn spray foam earns its keep most in March and April. Days climb above freezing while nights still drop well below, and the frost that built up under the roof steel overnight melts off in sheets by mid-morning. It can soak a whole mow of hay in a week.
A foamed roof never collects that frost layer in the first place. Steel that stays on the warm side of the dew point has nothing to thaw. If the barn floor is wet on sunny spring mornings, that is the clearest sign the roof needs foam.