ASTM C755 PDF

Each of these factors will have an effect on the retarder system performance and each must be considered and evaluated by the designer. Link to Active This link will always route to the current Active version of the standard. 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 are mathematical conversions to SI units that are provided for information only and are not considered standard.

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Water entry into an insulation system may be through diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water. Application specifications for insulation systems that operate below ambient dew-point temperatures should include an adequate vapor retarder system.

This may be separate and distinct from the insulation system or may be an integral part of it. For selection of adequate retarder systems to control vapor diffusion, it is necessary to establish acceptable practices and standards. The primary function of a vapor retarder is to control movement of diffusing water vapor into or through a permeable insulation system.

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

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 designer could approach this requirement by selecting a membrane retarder material that has a lower permeance manufactured in 5-ft 1.

These alternatives may be approximately equivalent on an installed basis since the wider material has fewer seams and joints. The permeance of the substrate and its effects on the application of the retarder material must also be considered in this case. Scope 1. It is intended for the guidance of design engineers in preparing vapor retarder application specifications for control of water vapor flow through thermal insulation.

Emphasis is placed on the control of moisture penetration by choice of the most suitable components of the system. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Water entry into an insulation system may be through diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water. Application specifications for insulation systems that operate below ambient dew-point temperatures should include an adequate vapor retarder system. This may be separate and distinct from the insulation system or may be an integral part of it. For selection of adequate retarder systems to control vapor diffusion, it is necessary to establish acceptable practices and standards. The primary function of a vapor retarder is to control movement of diffusing water vapor into or through a permeable insulation system. 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.

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ASTM C755 - 20

Several ways exist by which water enters into an insulation system, the primary ones being diffusion of water vapor, air leakage carrying water vapor, and leakage of surface water. Application specifications for insulation systems that operate below ambient dew-point temperatures necessarily include an adequate vapor retarder system. A vapor retarder system is separate and distinct from the insulation itself, or is provided by the insulation itself when it is has adequate vapor resistant properties, in which case a separate vapor retarder system is not necessary. For selection of adequate retarder systems to control vapor diffusion, it is necessary to establish acceptable practices and standards. The vapor retarder system in some cases is designed to prevent entry of surface water.

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