The Masterful Standard
Flashing Seal Audit
To maintain the watertight integrity of the transition zones where the roof deck meets vertical surfaces, which are the most common points of catastrophic leak failure.
Safety Warning
By accessing or using this checklist, you acknowledge that home maintenance and the use of ladders, power tools, or height-safety equipment involve inherent risks of severe injury, paralysis, or death, and you voluntarily assume all such risks. The information provided is for general educational purposes only, does not constitute professional advice, and may not be suitable for your specific property conditions or local building codes. Masterful Maintenance LLC and its affiliates disclaim all liability for any personal injury, property damage, or financial loss arising from the use or misuse of these instructions. You are responsible for maintaining your own safety equipment and following OSHA-compliant safety protocols; if you are not professionally trained, you must stop immediately and hire a licensed, bonded, and insured contractor. Your use of this document constitutes a full release of all claims against the publisher, and you agree that any reliance on this information is at your own sole risk.
Tools Required
- Extension ladder
- plastic putty knife
- high-quality tri-polymer sealant
- caulking gun
- wire brush for cleaning
- binoculars
Masterful Instructions
Begin the inspection at the base of all vertical projections including chimneys, dormer walls, and vent pipes to identify any separation between the metal flashing and the roofing material or the structure’s cladding. Position a stable extension ladder to reach the eaves and transition to the roof surface only if the pitch and weather conditions permit safe traversal using appropriate fall protection. Inspect the counter-flashing or reglet joints where metal is inset into masonry, looking for cracked or missing mortar and failed polyurethane sealants that have become brittle or alligatored from UV exposure. Examine the step flashing along sidewalls to ensure each metal shingle is properly integrated with the roof courses and that no mechanical fasteners have been driven through the exposed face of the metal, which creates a direct path for moisture. Check the apron flashing at the downslope side of projections for lifting caused by wind or thermal expansion, and verify that the cricket or saddle behind wide chimneys is clear of debris and that its peak seal is intact. Use a plastic putty knife to gently probe the edges of the flashing; if the sealant flakes away or the metal moves independently of the structure, the bond has failed. Finalize the walkthrough by inspecting the rubber boots or collars on plumbing vent stacks for dry rot or splitting at the compression ring, ensuring the seal is tight against the PVC or cast iron pipe.
Look for rust weeping or orange staining on the shingles below a flashing point; this indicates the protective galvanization has failed on the underside of the metal, meaning the flashing is likely rotting from the inside out and requires full replacement rather than just a new bead of sealant.