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501.5-98

AAMA 501.5-98-Test Method For Thermal Cycling Of Exterior Walls

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This test method provides a standard laboratory procedure for evaluation of thermal cycling effects on large exterior wall mock-ups, components, and cladding. This test method utilizes convective hot air to achieve the exterior air temperature setpoint. The convective hot air exposure method usually provides a more severe test than infrared radiation methods because it elevates the exterior air temperature to levels that are not obtainable in real world conditions. This method is not intended for the evaluation of individual components such as windows and doors. Thermal cycling is conducted to evaluate an exterior wall system's ability to maintain acceptable performance characteristics after being subjected to a specified number and range of thermal cycles. The primary performance evaluations to determine the effects of thermal cycling are measured by testing air leakage (ASTM E 283) and water penetration (ASTM E 331) before and after thermal cycling. Other tests may be used to characterize the system performance, but they must be specified in the contract documents. Condensation resistance performance and measurement is not a part of this test method due to many uncontrollable variables that prevent standardization and reproducibility. Variables that affect air flow and ambient air conditions needed to reproduce standard exterior and interior air films are difficult to control in multi-story mock-ups. Ambient temperatures within a +3„aC (+5„aF) range may result in surface temperatures with a similar range. Consequently, the thermal cycling tests results will not have the accuracy or reproducibility of AAMA 1503. This limitation does not affect the overall validity of this method for evaluating thermal cycling performance.

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