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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 – 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. These alternatives may be approximately equivalent on an installed basis since the wider material has fewer seams and joints.

Application specifications for insulation systems that operate below ambient dew-point temperatures should include an adequate vapor retarder system. The vapor retarder system alone is seldom intended to prevent either entry of surface water or air leakage, asgm 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.

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 v755 standard.

Work Item s – proposed revisions of this standard. The primary function of a vapor retarder is to control movement of diffusing water vapor into or through a permeable insulation system. Link to Active This link will always route to the current Active version of the standard. For selection of adequate retarder systems to satm vapor diffusion, it is necessary to establish acceptable practices and standards.

The effectiveness of installation or application techniques in obtaining design water vapor transmission WVT performance must be considered in the selection of retarder materials. The values given in parentheses qstm mathematical conversions to SI units that are provided for information only and are not considered standard.

The permeance of the substrate and its effects on the application of the retarder material must also be considered in this case.

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It is intended for the guidance of design engineers in preparing vapor retarder application specifications for control of water vapor flow through thermal insulation.

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

This may be separate and distinct from the insulation system or may be an integral part of f755. Water entry into an insulation system may be through diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water. 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.

Each of these factors will have an effect on the retarder system performance and each must be considered and evaluated by the designer.