Maintenance & Inspection• 8 min read
How to Spot Hidden Window Water Damage: Prevention, Detection & Remediation
NFRC & AAMA
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Energy Star v7.0
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Process
Authored by Marcus Vance • Updated on 2026-04-18
Master Step-by-Step Action Plan
1
Conduct Physical Sill Probing
Test timber sills and stools with a blunt probe to detect soft wood rot.
2
Inspect Exterior Caulking & Flashing
Examine horizontal head flashing for proper kickout and sealant adhesion.
3
Scan Walls with Thermal Infrared
Detect hidden moisture evaporative cooling pockets inside stud bays.
4
Replace Failed Flashing Assemblies
Install self-adhered butyl membranes shingled with building paper.
## Detecting and Arresting Window Water Intrusion
Window leaks rarely look like gushing waterfalls. Most water intrusion occurs as slow, silent seepage that rots wall sheathing and invites termite colonization over several seasons.
### The Diagnostic Inspection Protocol:
- **Inspect Exterior Head Flashing:** Ensure a rigid metal Z-flashing is installed above the top window trim, directing water out over the siding.
- **Check Sill Weep Holes:** Ensure exterior bottom frame drainage slots are free of caulking blockage or insect debris.
- **Examine Interior Baseboards:** Soft, discolored, or warped baseboard trim beneath a window is a sure sign of water tracking down studs.
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