Referenced Documents. ASTM Standards: D Test Method for Tensile Properties of Paper and. Paperboard Using Constant-Rate-of-Elongation Appara -. ASTM C Valid from. 01/10/ Information provider. American Society of Testing and Materials. Author. American Society of Testing and Materials. Description. This practice outlines factors to be considered, describes design principles and procedures for water vapor retarder selection, and defines water.

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ASTM C – 97 Standard Practice for Selection of Vapor Retarders for Thermal Insulation

It is intended for the guidance of design engineers in preparing vapor retarder application specifications for control of water vapor flow through thermal insulation. The primary function of a vapor retarder is to control movement of diffusing water vapor into or through a permeable insulation system.

Application specifications for insulation systems that operate below ambient dew-point temperatures should include an adequate vapor retarder system. These alternatives may be approximately equivalent on an installed awtm since the wider material has fewer seams and joints. For selection of adequate retarder systems to control vapor diffusion, it is necessary to establish acceptable practices and standards. Each of these factors will have an effect on the retarder system performance and each must be considered and evaluated by the designer.


Water entry into an insulation system may asmt through diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

ASTM C – 10 Standard Practice for Selection of Water Vapor Retarders for Thermal Insulation

Emphasis is placed on the control of moisture penetration by choice of the most suitable components of the system. Link to Active This link will always route to the current Active version of the standard.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard.

Work Item s – proposed revisions of c55 standard.

The vapor retarder system alone is seldom intended to prevent either entry of surface water c755 air leakage, but it may be considered as a second line of defense. The designer could approach this requirement by selecting a membrane retarder material that has a lower permeance manufactured in 5-ft 1.


The effectiveness of installation or application techniques in obtaining design water vapor transmission WVT performance must be considered in the selection of retarder materials.

Standard Practice for Selection of Water Vapor Retarders for Thermal Insulation

The permeance of the substrate and its effects on the application of the retarder material must also be considered in this case. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

This may be separate and distinct from the insulation system ast, may be an integral part of it.