SPF (Spray Foam) Roof Best Practices

[Bobthetractor]

I plan on doing closed cell spray foam on the metal roof now. At the moment I only have the gable end walls up and won't have the other two up for about 12 months as I'm still deciding on final layout.

Should I seal up the soffit and ridge vent now (with foam) or leave open? My gut says leave it open for now and come back and seal when I install HVAC which will be a few years out and one of the last things I do. I know that you want to ultimately close up the envelope once you condition the space but I'm not there yet.

I'm in hot sticky Florida and I know once the two 100' side walls go up circulation is going to be minimal so this seems like the best way to vent and keep from cooking like a car parked in the sun. I will say that it is surprisingly cooler than expected under there now with no insulation but again I've currently got good natural ventilation, 14' floor to truss and, a new white metal roof.

Anyone with experience on this? I'd like to to the roof now so I can start to move stuff in and not have to worry about moving everything down the road so they can qet equipment in there or worry about product falling and getting on stuff.

 

[kj_mustang]

If you are putting spray foam directly to the roof metal, you are eliminating the need for the venting. Soffit and ridge vents are only needed if you are using a insulated ceiling so you can vent the attic area. In your situation, I am not sure what would be the best course of action. I will say that having my pole building completely spray foamed with 2" closed cell and leaving it totally shut up in the summer, you will be surprised at how much cooler it is inside.

 

[dcg9381]

Seal it.. And it's easier to do now when the foam gun is out.