Decide between AAMA/FGIA 501.2 and 501.3 for an installed curtain wall field water-leak investigation

Steps

1. Confirm current scope of AAMA 501.3 on the FGIA store before citing it — publicly available summaries describe it as a field check of water penetration through installed exterior windows, curtain walls and doors by uniform air pressure difference; verify this wording against the current published scope.
2. Compare 501.3's chamber/uniform-air-pressure method (closer to a scaled-down field version of ASTM E1105) against 501.2's simpler hose-nozzle diagnostic spray.
3. Select 501.3 when a quantifiable pass/fail result under a defined pressure differential is needed (e.g., forensic/litigation-grade documentation); select 501.2 for quick diagnostic leak-location work.
4. Confirm equipment and crew availability — 501.3 requires a sealed test chamber against the wall, which is more setup-intensive than 501.2's hose rig.
5. Coordinate access (swing stage, lift) and building occupant notification separately for each method, since chamber setup for 501.3 typically takes longer per test location.