Vapor Barrier On Metal Roof Deck

Add a preinstalled membrane to absorb and release the condensation as it forms with the natural weather cycle traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point.

Vapor barrier on metal roof deck.

Used as an air and vapor barrier direct to metal decking. A 15 mil composite reinforced aluminum coated poly with a self adhering sbs. The most common material used for an insulating metal roof is fiberglass batts or glass mineral wool. Selecting metal roofing trim.

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 wood panels that is installed directly over a metal deck. Architectural metal roofs with felt underlayment are best suited for buildings with proper slope and low moisture loads in dry or arid climates. For example providing a hypothetical 1 5 open area will. How to prepare for metal roof installation.

The batts are located side to side on the rafter of the roof. Felt underlayment provides little resistance to air and moisture vapor migration and does not serve as an effective air barrier. Metal as the preferred material for self storage facilities. The steel deck acts as a vapor barrier preventing diffusion of water vapor out from the bottom of the slab.

Some publications references 3 and 4 note that the amount of diffusion is directly proportional to the open area in the vapor barrier ficks law. A vapor retarder is commonly installed on the warm interior side of a roof or wall. V gard provides an excellent vapor barrier with a vapor resistance value expressed by an sd equivalent air layer thickness of 1 500 m. It is therefore suitable for most roofs.

Tips for installing metal roofing accessories. In a low slope roof assembly the vapor retarder is normally installed under the primary roof insulation. Another option for the roofing system is to recognize a hardboard or sheathing layer can be a vapor open air barrier. Resistant to foot traffic the engineered composition of v gard provides high resistance to static loading and dynamic impact.

Both materials make a great physical barrier between the interior building and the metal roof.