Flashings

Flashings keep roofs dry by directing water away from joints, transitions, and penetrations. Properly selected and installed roof flashing prevents leaks at chimneys, skylights, valleys, sidewalls, eaves, and vents, extending roof life and reducing repair costs. This directory highlights roofing flashings for asphalt shingle, metal, tile, and low-slope systems, with options for new builds, roof flashing installation, and repair projects.

Common types and uses:
- Step flashing for shingle-to-wall sidewalls
- Apron flashing at headwalls and dormers
- Counter flashing over base flashing at chimneys
- Valley flashing to carry concentrated runoff
- Drip edge to protect eaves and rake edges
- Kick-out flashing to deflect water into gutters
- Pipe boots for vent stacks and flues
- Roll flashing for custom transitions

Materials include aluminum, galvanized steel, copper, stainless steel, lead, and flexible EPDM or butyl membranes. Choose based on climate, roof covering, and exposure. Coastal sites benefit from stainless or copper; aluminum is lightweight and paintable; galvanized steel offers strength and value; lead conforms to uneven masonry; EPDM boots and butyl tapes seal complex penetrations.

Selection tips:
- Match profile and gauge to roof system and code
- Ensure compatibility to avoid galvanic corrosion with dissimilar metals
- Prefer prefinished coatings for UV and salt resistance
- Size for proper overlaps and water paths; add end dams where needed

Installation best practices:
- Layer flashing shingle-style with correct laps
- Fasten high on the flange; keep penetrations out of water channels
- Use butyl or polyurethane sealants; avoid relying on caulk alone
- Integrate with underlayments and counter flashing for redundancy

Maintenance is straightforward: inspect annually for loose fasteners, rust, lifting edges, and cracked sealant; clear debris from valleys; replace damaged sections promptly. Quality roof flashing, correctly chosen and installed, improves waterproofing performance, curb appeal, and energy efficiency.