Pole Barn Metal Roof Underlayment

Moisture can collect on the inside of your metal roof whenever warm moist air inside your building meets the cold metal of your roof.

Pole barn metal roof underlayment. Your risk is when warm moist air from inside hits the cool back side of the roof system. I m looking at a pole barn with steel trusses made of 2 2. This type of underlayment is critical to a quality roof installation. Single bubble vapor barrier is designed to prevent such inside rain by keeping the metal from sweating.

The problem with using. In a residential application however condensation is a concern. This building will have a shed roof that will be difficult to ventilate well so it seems that the breath ability of felt paper would be good and would be more likely to be installed properly by a pole barn contractor but i have heard that the felt is a poor choice for metal roofs because of the heat and expansion of the metal. Insulation and ventilation are going to be keys for you.

When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended. Synthetic underlayment is a roofing accessory created by weaving spinning together polypropylene or polyethylene and a polymer to form an all over protective barrier to put between the roofing material and the roof deck. Once again this is used on cold roof construction. But a preinstalled membrane may be even more effective at removing condensation.

It will want to condense. In a barn shop or other outbuilding you can attach your metal roof directly to the purlins. Pole barn vapor barrier. Underlayment and insulation.

The underlayment doesn t really impact condensation in your case the condensation will just occur on it rather than on the metal itself. Metal roof condensation. R value up 6 8 down 15 2 horizontal 8 5. Make sure the product is designed to be used under metal.

I live in an hoa and we don t allow steel buildings roofs. It serves as a moisture barrier as well as a slip sheet. Synthetic underlayment is a newer innovation that is taking over the metal roofing industry as a better more advanced replacement for felt underlayment. We ll add a vapor barrier so the moist air does not flow up through the insulation and condense on the roof.

Metal roofs are notorious for the annoying drips that occur inside the building. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.