Vapor Barrier Under Epdm Roof

Attention roof system designers.

Vapor barrier under epdm roof.

A vapor retarder is commonly installed on the warm interior side of a roof or wall. Air vapor and water barrier products for all six sides of the building envelope 3. Therefore one will often see it installed directly on a roof deck such as a concrete or wood deck or on a continuous substrate such as gypsum board or. The vapor barrier protects the roof insulation from the vapor included in the interior air.

When re roofing apply one 1 ply of no. Side laps shall be minimum 100mm 4 wide and end laps shall be minimum 150mm 6 wide. Numerous roof components work together to affect a building pages. This vapor if left unchecked can wet the insulation and over time will reduce the r value of the insulation and lead to mold.

The firestone v gard vapor control membrane is designed to be used as vapor control layer in firestone roofing systems. Vapor control membranes play a very important role in this. Laps shall be fully sealed in an application of hot bitumen. Features from the hutchinson files tagged with.

Everyone knows that water in roof systems is never a positive. A vapor barrier can be loose laid or fully adhered. 1 2 3 filed under. 15 organic felt adhered in a full application of hot asphalt applied at the approximate rate of 1kg m2 20 lbs 100 sq.

Typically a vapor retarder has to have a perm rating of 1 0 or less to be successful. In a low slope roof assembly the vapor retarder is normally installed under the primary roof insulation. A loose laid vapor barrier is just a big sheet of 6 mil plastic that is. The roof is a large part of the building envelope and therefore has a significant impact on the flow of energy in and out of buildings.

That reduction of air and moisture infiltration can then help improve roof longevity.