Standard Practice for Use of Test Methods for Determining the Water Vapor Transmission (WVT) of Exterior Insulation and Finish Systems (EIFS)

Importancia y uso:

5.1 The purpose of this test is to obtain steady state values of water vapor transfer through the EIFS sample. This characteristic of EIFS is commonly requested by regulatory and design organizations, and is used in thermal and moisture studies of building walls. The degree to which an EIFS allows water vapor to pass through it can affect the performance of an EIFS wall assembly.

5.2 A permeance value obtained under one set of test conditions does not indicate the value under a different set of conditions. For this reason, the test conditions selected are those that most closely approach the conditions of use for EIFS components and assemblies.

5.3 This standard should not be used alone as the sole means for evaluating the water vapor transmission characteristics of a given EIFS wall assembly. Other methods are available, and should be considered and used as appropriate.

5.4 To be meaningful in evaluating the thermal and moisture condition of a given EIFS wall assembly, the specimens used in this standard should represent closely the materials that actually exist, or will exist, on a given building.

Subcomité:

E06.58

Volúmen:

04.12

Número ICS:

91.120.30 (Waterproofing)

Palabras clave:

ASTM Test Methods ; condensation; EIFS; exterior insulation and finish system; finish; insulation; moisture; permeability; permeance; reinforced basecoat; reinforcing mesh; water vapor; water vapor transmission; WVT;