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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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.
The primary function of a vapor aatm is to control movement of diffusing water vapor into or through a permeable insulation system.
The values given in parentheses are mathematical conversions to SI units asfm are provided for information only and are not considered standard.
These alternatives may be approximately equivalent on an installed basis since the wider material has fewer seams and joints.
ASTM C755 – 10(2015)e1
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 permeance of the substrate and its effects on the application of the retarder material must also be considered in this case. The vapor retarder system alone is seldom intended to prevent either entry of surface water or air leakage, but it may be considered as a second line of defense.
This may be separate and distinct from the insulation system or may be an integral part of it. Water entry into an insulation system may be through diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water.
ASTM C – 10 Standard Practice for Selection of Water Vapor Retarders for Thermal Insulation
Application specifications d755 insulation systems that operate below ambient dew-point temperatures should include an adequate vapor retarder system. For selection of adequate retarder systems to control vapor diffusion, it is necessary to establish acceptable practices and standards. It is intended for the guidance of design engineers in preparing vapor retarder application specifications for control of water vapor flow through thermal insulation.
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The designer could approach this requirement by astj 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.
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Emphasis is placed on the control of moisture penetration by choice of the most suitable components of the system. Each of these factors will have an effect on the retarder system performance and each must be considered and evaluated by the designer.