Most leak repairs fail because the roofer guessed. Active water testing replicates rain under control — one zone at a time, with a spotter watching the interior — so we name the actual defect instead of the nearest one. You leave with a scope a repair crew can price and warranty.
Controlled hose test with interior spotter
Zone-by-zone isolation of every suspect penetration
Attic-side inspection for stain age and travel path
Moisture meter readings on sheathing and drywall
Photo timeline of test sequence for insurance or warranty claims
Written scope naming the exact defect and repair method
Controlled water test with garden hose at rain-equivalent pressure. Interior spotter with two-way radio watching stain and attic. Zone-by-zone isolation starting downhill and working up. Moisture-meter readings before, during, and after each zone. Attic-side stain aging (fresh vs old) to separate active leak from prior damage. Photo timeline of test sequence for insurance or warranty paper trail. Written scope naming defect, repair method, and estimated cost band.
Homeowners with an active leak of unknown source. Homeowners after two or more failed repair attempts. Buyers under contract with a disclosed leak needing source-of-loss. Property managers with recurring tenant leak complaints. Insurance claims where the carrier is disputing the point of entry.
Verbal Walk + Test — $199 Standard Water-Test Report — $449 Extended Multi-Zone Test w/ Attic Trace — $749 Insurance Claim / Litigation Grade — $1,200+ Most residential water tests are $449–$749. Naming the defect on the first pass typically saves 1–2 failed repair attempts at $300–$800 each.
Roof leaks lie. A stain three feet from a skylight can be flashing, an underlayment tear, a plumbing vent, or a sidewall step-flashing gap uphill. Guessing gets homeowners two or three failed repairs. A controlled hose test with a spotter in the attic isolates one variable at a time and names the actual defect.
Two to four hours on-site. I isolate the suspect area, run water for 15–30 minutes per zone with a spotter watching the interior, and stop the moment we replicate the leak. If we don't replicate on the first suspect, we move uphill and test again.
No. A garden hose at normal pressure is gentler than a monsoon cell. The test replicates real rain, not high-pressure washing. I never test on frozen roofs or in freezing conditions.
Hail/wind + NOAA event correlation.
Map wet insulation before you recoat.
IRC / IBC / NMCID cited per finding.
Per-door pricing + rolled-up capex plan.
I've watched too many neighbors sign contracts they didn't understand for roofs they didn't need. That stops with a written report they own.