Sugar Land Roofing: Article About Vapor Barriers
Many homeowners who have trouble with condensation or humidity levels may be looking for something that can help them better protect their roofing components against damage. One possible solution could be to have a vapor barrier, or retarder, installed by a trusted Sugar Land roofing contractor.
A vapor barrier, or retarder, is a component of the roof that restricts the movement of water vapor molecules from areas with higher humidity levels to areas of lower humidity levels. Vapor barriers can be made out of a number of different substances, including PVC sheets, aluminum foil and asphalt saturated felts. In order to be considered a vapor barrier, the vapor permeance rating cannot exceed .1 perms. If the material is placed on the inner walls or ceiling of the building, the barrier can slow down the transfer of water molecules from the humid interior to the wood components inside the wall. If the barrier is installed on the outer walls or roof, the barrier can slow down the transmission of vapors from the outside environment into the interior wood materials.
There are a number of distinct advantages to having a vapor barrier installed.
The roofing experts at Brinkmann Quality Roofing Services of Sugar Land TX can assist you with questions about residential roofing or gutters.
Although a barrier cannot completely stop the transmission of water vapor, the material can keep the vapor from condensing. Condensation occurs when the water vapor reaches the dew point. It is at this point that damage can occur to the roof's structural components. By installing a retarder or a barrier, the amount of condensation that may form on the wooden roof components may be reduced.
There are also some major downsides to having a vapor barrier installed. Essentially, it is very rare for water vapor to diffuse through the roof in most residential buildings. The exceptions to this are if the home is located in an extremely cold climate, if the home consistently uses humidifiers or if the home has humid rooms such as an indoor pool or a greenhouse. In certain climates, the installation of a barrier or a retarder can actually cause water and mold problems because they can trap moisture in the confined space of the attic.
In general, it is not recommended that a vapor barrier be installed in a normal residential home or building because it is more likely to cause problems than reduce the risk of damage. If the building does meet one of the criteria for a barrier or retarder installation, it is still recommended that the homeowners consult with their trusted roofers before making a final decision.