Early warning signs are visible if you look: (1) Rust stains on flashing or below it, (2) Gaps where flashing meets roof/wall – should be sealed tight, (3) Bent, lifted, or missing sections, (4) Cracked or missing sealant, (5) Granules collecting at flashing edges indicating water flow issues. Check from ground with binoculars twice yearly. Also watch for: ceiling stains near walls/chimneys (early interior sign), damp attic insulation near penetrations, efflorescence on chimney (white powder = water intrusion). Most people discover flashing failure after interior damage = too late and expensive.

Rarely a good long-term solution. Sealant over failed flashing is like painting over rust – temporary at best. Problems: (1) Sealant doesn’t fix bent/separated metal, (2) UV exposure degrades sealant in 2-5 years, (3) Traps water behind if flashing is compromised, (4) Makes proper repair harder later. Only seal if: flashing is structurally sound, small isolated holes/cracks, temporary fix until replacement. If flashing is rusted, bent, or improperly installed, replacement is only real solution. The $300 saved becomes $3,000 in water damage.

Huge scope differences. $200 quote = slap sealant on it, 1-hour job, no warranty, probably fails within year. $1,500 quote = remove shingles/siding as needed, remove old flashing completely, install new proper-gauge metal, integrate correctly with roofing, seal all joints, warranty work. Cheap quotes often skip: proper metal gauge, correct overlap, counter flashing, cricket installation, removing old material. Ask what’s included: just sealant or full replacement? Quality of materials? Warranty period? Written detailed scope? The expensive quote often cheaper long-term.

ALWAYS during roofing – saves 50-70% on labor. Roofers already there, safety equipment in place, perfect integration with new shingles. Separate flashing job requires: removing/replacing shingles ($$$), mobilization costs, potential warranty conflicts. Even if flashing “looks OK,” replace during roofing because: hidden damage often exists, new roof deserves new flashing, prevents callbacks, single warranty covers all. Only exception: recent flashing upgrade (under 5 years) in perfect condition. Otherwise, penny wise = pound foolish.

Unfortunately yes, and it’s a RED FLAG. Many roofers aren’t skilled in proper chimney flashing – it’s complex masonry work. They’ll say “existing looks fine” to avoid it. Problems: old flashing often hides damage, new roof movement can break old seals, chimney flashing is #1 leak source. Insist on: removal and inspection of old flashing, new step flashing (not continuous), proper cricket if chimney >30″ wide, counter flashing into mortar joints. If roofer resists, find another. Chimney flashing is too critical to skip. Add $500-1,000 to roof quote but prevents major problems.

Inspect twice yearly: spring (after winter damage) and fall (before winter). Look for: separated joints, rust, missing sealant, debris accumulation. Professional inspection every 3-5 years catches hidden issues. Maintenance schedule: Clean valleys/debris (2x year), touch-up sealant (annually), replace pipe boots (10 years), full flashing (20-30 years with roof). Cost: DIY inspection free, professional $200-300, annual maintenance $100-200. This prevents 95% of flashing failures. Most expensive repair is the one you didn’t prevent. Document with photos to track changes.

Simple repairs maybe, full installation rarely wise. DIY possible: pipe boot replacement, minor sealant touch-ups, basic drip edge. DIY disasters: chimney flashing (complex), valley flashing (critical water flow), step flashing (must integrate with siding). Problems with DIY: improper overlap = guaranteed leaks, wrong materials = premature failure, code violations = insurance issues, no warranty protection. Falls from roofs = #1 DIY injury. If you must DIY: watch multiple videos, buy quality materials, follow manufacturer specs exactly, know when to stop. Most DIY flashing fails within 2 years. Professional job worth the cost.