07 26 00 Vapor Retarders
Use this CSI 3-part SimpleSpecs™ master specification to specify vapor retarders to control moisture vapor transmission passage through the roof, wall, and floor floors.
The section includes materials used in interior and exterior assemblies where areas of different conditions occur. Such as steam rooms.
The term vapor retarder defines a material with a moisture vapor transmission rate of less than one (1) perm. The term vapor barrier is often used to describe these plastics, but that is discouraged. As it is nearly impossible to construct an absolute barrier.
The design professional should take careful consideration of various factors to prevent condensation within the roof, wall, and floor assemblies. Climatic conditions including mean summer and winter temperatures and average relative humidity, both indoor and outdoor, can have a huge effect on moisture vapor movement. In addition, the location of the vapor retarder within the assembly is critical.
In order to be effective, the vapor retarder must be continuous. With joints sealed and the vapor retarder sealed around all penetrations and at the perimeter.
Related Testing Standard:
Related SimpleSpecs™ master specification:
The SimpleSpecs™ master specs concept
Design professionals are accustomed to seeing lengthy project specifications, so why is SimpleSpecs™ so short?
Specifications have grown evermore wordy over the years for several reasons:
The mistaken belief that specifications must be lengthy and legal-sounding to be enforceable. In fact, quite the opposite is true. Having shorter, easily understood specifications makes us less likely to have problems in the field.
A belief that having lots of words protects us from a Contactor making mistakes. There is no way to include enough statements to protect yourself from a bad contractor, regardless of the length of your specification.
Our desire to be in control of the project by specifying means and methods instead of including simple, enforceable statements.
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