Site Hose Tests
Spraying water in a prescribed way at the joints in the system is a quick and easy check on whether the system is vulnerable to leakage. It does not confirm the performance in a formal way, however. This is done using the Static Water Penetration Test with a temporary chamber similar to the laboratory test. In the Hose Test, an operator on the outside using the correct nozzle and pressure, works along the joints spraying water from 30cm and spending 5 minuttes on each 1.5m while someone observes from the inside. The Hose Test should be employed periodically during construction as a check on workmanship (the design having already been validated in the laboratory).
We sometimes see the Hose Test used as a basis for accepting the curtain wall at the end of the project, however this is not good practice unless hose testing has been carried out throughout the project. Similarly specifications sometime call for a percentage of the building to be tested. Again, this testing should be conducted as the work proceeds, since it obvioiusly serves no-one to discover defects in the building cladding at the end of the job when available corrective actions are limited. When a large area is specified but the results are consistently good, the amount of testing might be relaxed to some degree.
We are accredited under ISO 17025 to conduct hose testing to AAMA 501.2, the most common standard for this test and the one from which other such standards are derived.