Metal roof panels come mainly as exposed-fastener ribbed panels or concealed-fastener standing seam, with matching trim. King Roof Care works with metal roofing systems and repairs metal roofs, including damaged panel replacement, across Kirkland, Bothell, Everett, Issaquah and Redmond, WA. This guide is for homeowners who want panels installed, replaced or repaired; the company's site does not list retail panel sales, so shoppers buying sheets get a spec checklist here.
Metal Roof Panel Types: Exposed-Fastener vs Standing Seam
Metal roof panels are grouped by how they attach to the roof. Exposed-fastener panels are screwed through the face of the metal. Standing seam panels hide their fasteners under raised seams that lock or snap together.
- Profile name and type: ribbed, corrugated or standing seam.
- Coverage width per sheet, which differs from the full sheet width because of the overlap.
- Cut lengths needed for each roof plane, measured from eave to ridge.
- Gauge, base metal, metallic coating and paint finish.
- Matching trim for that exact profile: eave, rake, ridge cap, valley and wall flashing.
- Fasteners, sealing washers and foam closures made for that profile and metal.
- The manufacturer's installation instructions and the underlayment they call for.
| Feature | Exposed-fastener (ribbed/corrugated) | Standing seam (concealed fastener) |
|---|---|---|
| How panels attach | Screws through the panel face | Hidden clips or nail strip under the seam |
| Fasteners exposed to weather | Yes, every screw and washer | No, fasteners sit under the next panel |
| Upkeep to plan for | Periodic checks of screws and washers | Seam, trim and flashing checks |
| Thermal movement | Movement stresses the screw holes | Clips are designed to allow movement |
| Appearance | Visible screw rows and ribs | Clean vertical seams |
| Common uses | Outbuildings, shops, some homes | Homes and buildings where a cleaner look is wanted |
Metal Roof Panel Materials, Gauge and Hail Dents
Metal roof panel material affects cost, appearance, dent resistance and how the roof handles moisture over time. Steel panels carry a metallic coating and usually a painted finish. Aluminum does not rust the way bare steel does, but it is a softer metal. Copper and zinc are chosen for their look and the natural patina they develop.
| Material | Strengths | Trade-offs | What to ask |
|---|---|---|---|
| Coated steel | Wide range of profiles, colors and gauges | Cut edges and scratches need attention to limit rust | Which coating and paint system, and which gauge? |
| Aluminum | Does not rust like bare steel | Softer metal, so it can dent more easily | Which thickness, and are fasteners compatible? |
| Copper | Distinctive look that develops a patina | Higher material cost; runoff can stain or affect other metals | Will it sit near steel or aluminum parts? |
| Zinc | Develops a protective surface layer over time | Needs installers familiar with the material | Which underlayment does the manufacturer specify? |
Metal Roof Trim Pieces Explained: Ridge Cap, Eave, Rake, Valley and J-Channel
Metal roof trim pieces seal the edges and joints where flat panels cannot cover the roof on their own. When you plan or inspect a panel roof, check every edge, transition and penetration closely, and order the trim made for your exact panel profile.
- Eave trim or drip edge: carries water off the lower edge and into the gutter.
- Rake or gable trim: covers the sloped side edges of the roof.
- Ridge cap: seals the peak, usually over closures on ribbed panels.
- Valley flashing: lines the inside corner where two roof slopes meet.
- Sidewall and endwall flashing: seals the roof where it meets a vertical wall.
- Pipe boots and penetration flashing: seal around vents, chimneys and skylights.
- J-channel and liner panels: mainly for metal building walls and interiors.
Installing Metal Roof Panels Over Shingles, and the Install Sequence
Whether metal roof panels can go over an existing shingle roof depends on the panel manufacturer's instructions, the condition of the deck underneath, how many roof layers are already there, and local rules. Confirm permit needs with the City of Kirkland, Bothell, Everett, Issaquah or Redmond before work starts.
- On-site inspection of the roof, attic and ventilation.
- Written estimate listing the scope and materials.
- Permit check with the city before work starts.
- Tear-off and haul-away of the old roofing.
- Deck inspection, with damaged sheathing replaced as needed.
- New underlayment, plus ice-and-water protection where the roof requires it.
- Eave trim or drip edge along the lower edges.
- Valley flashing, then panels set square from the starting edge and fastened in the manufacturer's pattern.
- Wall and penetration flashing as panels reach each wall, vent or chimney.
- Rake trim, closures and ridge cap.
- Final check of flashing and fasteners, then full cleanup.
How Much Does a Metal Roof Panel Cost?
Metal roof panel cost depends on the panel type, metal, gauge, finish, cut length and quantity, so a per-panel price from a retailer only tells part of the story. A supply-only quote covers sheets and maybe trim. An installed quote adds tear-off, deck repairs, underlayment, flashing, labor and disposal. A repair quote may cover only a few panels and their fasteners.
- Panel type, profile, metal, gauge and finish named exactly.
- Tear-off and haul-away of old roofing, or a stated reason for an overlay.
- Deck inspection and how damaged sheathing repairs will be priced.
- Underlayment type, plus ice-and-water protection locations.
- Every trim piece: eave, rake, valley, sidewall, ridge cap and closures.
- Flashing at chimneys, vents, skylights and walls.
- Fastener type and whether it matches the panel metal.
- Gutter work, if gutters must come off or be replaced.
- Disposal, cleanup and protection of landscaping.
- Permit handling and any items the estimate excludes.
What Is the Biggest Problem With Metal Roofs? Mistakes That Cause Rework
The biggest problem with a metal roof depends on the panel type and how the roof was installed. No single issue applies to every roof. On exposed-fastener panels, the screws and their sealing washers are exposed to weather and need periodic checks. Washers can age and screws can loosen, which can let water in at the screw holes.
- Overdriven screws that crush the washer, or underdriven screws that never seal.
- Laps installed against the wind or water flow, so water runs into the seam.
- Missing foam closures under ridge caps or at eaves on ribbed panels.
- Cutting metal near installed panels so hot filings land on the finish and rust.
- Mixing panel, trim and fastener metals that react with each other.
- Skipping the attic and ventilation check before the panels go on.
- Walking on unsupported areas of the panel and leaving dents or creases.
Repair or Replace Damaged Metal Roof Panels in Kirkland, Bothell, Everett, Issaquah and Redmond
Damaged metal roof panels can often be repaired one by one, but widespread corrosion, many failed fasteners or a soft deck point toward replacement. King Roof Care repairs metal roofs, with a focus on corrosion prevention, damaged panel replacement and sealing. The company also handles storm damage repair. Its roof inspections include a detailed report, and its on-site inspection covers the roof, the attic and the ventilation. That makes it easier to decide before you order new panels. For more on timing, read when a metal roof should be replaced, or book a roof inspection.
King Roof Care is a registered Washington construction contractor, L&I registration KINGRRC782QA, which you can verify at lni.wa.gov. The company is rated 4.9 out of 5 on Google as of 2026-10-05. It is based at 16007 NE 6th St, Bellevue, and serves Kirkland, Bothell, Everett, Issaquah and Redmond, among other Puget Sound cities. Kirkland homeowners can find local details on the metal roofing in Kirkland page. Use this checklist to decide between repair and replacement:
- Is the damage limited to a few panels, or spread across the roof?
- Is rust only on the surface, or has it eaten through the metal?
- Do leaks come from fasteners and trim, or from the panels themselves?
- Does the attic show wet sheathing, staining or poor ventilation?
- Can matching panels and trim still be sourced for your profile?
- Would a repair quote and a replacement quote cover the same roof areas?