What is ASTM E1105 Testing?
The ASTM E1105 is the Standard Test Method for Field Determination of Water Penetration of installed exterior windows, skylights, doors, and curtain walls. It simulates wind-driven rain using calibrated spray equipment while applying a specified negative air pressure to mimic actual weather conditions.
Our lab-trained specialists operate calibrated, traceable equipment under strict parameters so your results are accurate, repeatable, and defensible for project documentation.
ASTM E1105 Test Procedures
Procedure A — Uniform Static Pressure
- Uniform static air pressure differential at the project-specified level.
- Water applied at 5.0 US gal/hr/ft² to exterior face and adjacent construction.
- Interior monitored for leakage during and immediately after the test.
- Typical duration: ~15 minutes.
Procedure B — Cyclic Static Pressure
- Typically four cycles of 5 minutes pressurized with 1 minute off between cycles (unless otherwise specified).
- Continuous water application at 5.0 US gal/hr/ft² during the test sequence.
- Interior monitored during and immediately after each cycle.
- Total duration: ~23 minutes.
Spray Rack Testing for Building Leak Detection
Spray Rack Testing is the common term for using the ASTM E1105 water spray apparatus. It delivers a controlled and measurable water flow, enabling repeatable testing that aligns with ASTM standards—ideal for forensic water intrusion investigations and quality assurance. By contrast, hose testing is informal, non-uniform, and lacks quantifiable controls, so it’s not recommended for performance verification.
Performance, Forensics & Retesting
Each location is reported as Pass or Fail based on water penetration to interior surfaces. If leakage is observed, we provide forensic diagnostics to determine cause and coordinate corrective actions with manufacturers and installers. After remediation, retesting verifies the effectiveness of repairs.
Local Service Areas
Los Angeles Division
Beverly Hills, Santa Monica, Pasadena, Burbank, Hollywood, Malibu, Sherman Oaks, Van Nuys, Santa Clarita
Orange County Division
Anaheim, Irvine, Newport Beach, Costa Mesa, Santa Ana, Huntington Beach
San Francisco Bay Area Division
San Jose, Oakland, Berkeley, Albany, San Rafael, San Carlos
San Diego Division
La Jolla, Chula Vista, Del Mar, Solana Beach, Carlsbad, Encinitas
Arizona Division
Phoenix, Scottsdale, Tucson, Mesa, Glendale
Nevada Division
Las Vegas, Reno
Frequently Asked Questions
How long does ASTM E1105 testing take?
Procedure A typically runs ~15 minutes. Procedure B usually runs ~23 minutes (four 5-minute cycles with 1-minute intervals), plus setup and documentation time.
Which products can be tested?
Windows, doors, storefronts, window walls, curtain walls, skylights, and other exterior cladding systems per project specifications.
Is spray rack testing the same as hose testing?
No. Spray rack testing uses calibrated equipment and quantifiable flow rates that meet ASTM standards. Hose testing is informal and lacks the controls needed for reliable, repeatable results.
What happens if a test location fails?
We document findings and can perform a forensic leak investigation. After remediation by the manufacturer/installer, we retest to confirm repairs.
Do you service projects outside California?
Yes. We service Arizona and Nevada with regional teams and can support projects across the U.S. upon request.