Pole Barn Roof Vapor Barrier

I am considering putting up poly or tyvek mike the pole barn guru responds.

Pole barn roof vapor barrier.

If your post frame building has barn style flat on the exterior of the columns girts how about install a thin layer of osb to the inside of the girts then spray foam against the osb. A well engineered wall often incorporates an air barrier such as tyvek on the outside of the insulation and a vapor barrier such as a 6 mil or greater polyethylene on the inside. Built on concrete slabs and often capped with metal roofing post frame construction can pose unique vapor barrier challenges. Steel roofing is a highly conductive material in terms of heat transfer.

Vapor pressure changes with temperature and humidity. Wall roof ceiling insulation. As the sun warms the steel on the roof the outside of the roof naturally heats up faster than the inside of the roof creating condensation and allowing moisture into your pole building. Pole barn or post frame buildings are typically constructed using wood framing with steel roofing and siding.

That outer air barrier also creates a surface for foam insulation to adhere to which can be helpful. I am concerned with air dust dirt leakage between the planks. Single bubble vapor barrier and 2. Vapor barriers are really only vapor retarding materials.

Single bubble vapor barrier acts as a reflector. It blocks condensation from dripping into a pole barn and runs it out of the eaves as well as adding a slight r value to the roof and also. If vapor pressure gets too high in your barn any vapor barrier will cease to work regardless of the material used or how carefully you seal it up. Should i have a vapor barrier between the planks and the blown in insulation.

Vapor pressure is what drives water vapor through a vapor barrier. Single bubble vapor barrier is a bubble wrap type material that is faced with reflective foil on the upper side and white vinyl on the inside. The radiant barrier reflective insulation is a vapor barrier so you would be sealing insulation between two vapor barriers not a good choice. Post frame buildings or pole barns are popular for commercial industrial and agricultural purposes.

If an exterior steel panel is ever damaged and has to be replaced. In a non insulated pole barn there will be a large amount of heat transferred in and out.