Included in the calculations shall be the R-value of the roof assembly components, anticipated interior and exterior temperatures, regional temperatures, the building's planned relative humidity, and any other pertinent data. The Three Primary Moisture Control Factors 1. Ventilation is the exchanging of air in a given space. Passive or mechanical ventilation is designed to control moisture and reduce heat buildup. Exchanging the air in a given space is accomplished by venting moisture-laden air to the outside, while inducing fresh outside, or conditioned drier air to the inside.
Insulation provides R-value and aids in temperature control within a building.
Insulating a roof reduces the amount of energy required to heat and cool a building and can also reduce the potential for condensation on interior surfaces or within the roof assembly. A vapor retarder is a Fields two or more sheet waterproof membrane adhered and coated with Fields asphalt. The vapor retarder is generally installed somewhere between the deck and the insulation. Vapor retarders are installed to inhibit the flow of moisture vapor into the roof assembly from the interior of a building. Adequate ventilation of the attic space is required.