Metal roofing panels are only one part of a complete roof. Trim and accessories manage water at ridges, eaves, rakes, valleys, walls, transitions, and penetrations. Ordering the wrong profile—or leaving one detail unresolved—can delay installation and create leaks that no amount of extra sealant will permanently fix.
This guide introduces the most common metal roofing trim pieces and the information Northwest Georgia contractors and property owners should gather before ordering. Final details must follow the selected panel manufacturer, project drawings, applicable code, and actual field conditions.
Ridge Cap
Ridge cap covers the high point where two roof slopes meet. Its dimensions and closure method depend on the roof pitch, panel profile, ventilation plan, and whether the assembly uses exposed fasteners or a concealed-fastener standing-seam system.
Before ordering, confirm the ridge length, roof pitches on both sides, panel rib or seam height, desired coverage, end treatment, venting requirement, closures or z-closures, fasteners, butyl tape, and sealant specified by the system.
Hip Cap
Hip cap covers an external diagonal intersection between roof planes. Although it may resemble ridge cap, hips can require different widths, hems, cleats, closures, notching, fastening, and installation sequence.
Measure every hip along the slope and identify where it meets the ridge, eave, and other hips. Complex intersections should be detailed before fabrication rather than improvised on the roof.
Rake or Gable Trim
Rake trim finishes the sloped roof edge at a gable. It helps control wind-driven rain, covers panel edges, and creates a clean transition to fascia or wall materials.
A useful rake-trim drawing identifies the roof leg, fascia leg, hems, cleats or attachment method, panel rib relationship, overhang, roof pitch, visible face, material, gauge, color, and total length. Left- and right-hand conditions may matter for certain profiles.
Eave or Drip-Edge Trim
Eave trim directs water from the roof edge into the gutter or away from the fascia. The detail must coordinate with underlayment, panel overhang, closures, fascia, gutter position, and any ventilation or membrane requirements.
Measure the complete eave length and note inside and outside corners, gutter conditions, roof transitions, existing fascia, and whether panels terminate over solid decking or another approved substrate.
Valley Trim
Valleys collect water from two roof slopes and often carry more runoff than other areas. Valley width, hem or return details, cleats, panel setback, underlayment, sealant, fastening, and end conditions should follow the roof system and expected water flow.
Record valley length along the slope, roof pitches, valley angle, panel profile, upper and lower termination, and any dormers or intersecting valleys. Short or overly narrow valley material can create installation and drainage problems.
Headwall Flashing
Headwall flashing is used where the upper end of a roof slope meets a vertical wall. It must direct water over the roofing while coordinating with wall cladding, building paper or water-resistive barrier, counterflashing, closures, and sealants.
Do not depend on a surface bead of caulk as the complete headwall detail. The wall and roof layers should be arranged to shed water in sequence.
Sidewall Flashing
Sidewall flashing runs where the side of a roof slope meets a vertical wall. Depending on the panel system and wall construction, the detail may use formed sidewall trim, receiver, counterflashing, step flashing, z-closures, hems, cleats, or other components.
Confirm which side of the roof meets the wall, panel rib location, roof pitch, wall material, visible faces, and how the wall’s weather barrier will lap with the flashing.
Transition Flashing
Transition trim is used where the roof pitch changes—for example, between a steep upper slope and a lower porch roof. It must cover the change while allowing each panel area to drain correctly and move as designed.
Provide both roof pitches, transition length, panel profile and seam height, panel termination locations, closure method, attachment method, and required laps. A generic angle without these facts is rarely enough.
Z-Closures, Cleats, and Receivers
Z-shaped closures, continuous cleats, and receiver pieces help secure trim, close panel openings, and create concealed attachment points. Their leg dimensions, hems, notches, gauge, and placement must match the panel and trim design.
Do not assume one z-closure works for every panel. Rib height, seam spacing, clip clearance, ventilation, drainage, and fastening requirements can change the shape.
Inside and Outside Closures
Closures fill the spaces between a formed panel and adjacent trim. Inside closures generally match the underside of the panel profile, while outside closures match the top profile. Vented closures may be used where the roof design requires airflow.
Confirm the exact panel profile before ordering. Similar-looking panels can have different rib spacing or geometry, and the wrong closure will not fit correctly.
Pipe Boots and Penetration Flashing
Pipes, vents, curbs, chimneys, and equipment penetrations require details compatible with the roof material, panel movement, temperature, pipe size, roof pitch, and manufacturer guidance. Boot size, material, base dimensions, fasteners, sealant, and location between panel ribs all matter.
Avoid placing a penetration in a seam, rib, valley, or concentrated drainage path when the design can be adjusted safely. Large or high-temperature penetrations may need a project-specific curb or flashing assembly.
Butyl Tape, Sealant, and Fasteners
Butyl tape creates concealed compression seals in many laps, closures, and trim joints. Gun-grade sealant is used at specified exposed or concealed locations. These products are not interchangeable, and compatibility with the roof coating and manufacturer requirements should be confirmed.
Fasteners must match the application: metal-to-wood, metal-to-metal, stitch screws, rivets, pancake-head screws, clips, or other approved hardware. Confirm diameter, length, coating, washer, color, substrate, spacing, and placement.
Custom Trim: What to Put on the Drawing
Sullins Metal & Siding Supply can fabricate many custom sheet-metal components. A clear drawing helps produce the right part the first time. Include:
- A cross-section of the finished shape.
- Every leg, return, hem, kick, lock, and open dimension.
- Angles or roof pitch when they control the bends.
- Which face is visible and which side receives the finish.
- Material type, gauge, color, finish, and protective-film requirement.
- Piece length, quantity, and whether pieces must lap in a particular direction.
- Any left-hand, right-hand, inside-corner, outside-corner, or end conditions.
- The panel profile, seam or rib height, and related building condition.
A photograph can explain the situation, but fabrication should be based on confirmed dimensions. Visit our custom sheet metal and copper fabrication page for more information.
Metal Roofing Trim Ordering Checklist
- Label every roof plane and detail on a sketch.
- Confirm roof pitch, panel profile, coverage width, gauge, color, and finish.
- Measure ridge, hip, eave, rake, valley, headwall, sidewall, and transition lengths separately.
- Identify all penetrations, curbs, chimneys, dormers, and wall intersections.
- Create dimensioned drawings for nonstandard trim.
- List closures, z-closures, cleats, butyl tape, sealants, clips, fasteners, underlayment, and boots.
- Add reasonable lap and waste allowances based on the installation plan.
- Confirm pickup, delivery, storage, and handling for long pieces.
- Review the final order before panels or custom trim are fabricated.
Common Trim Mistakes
- Ordering trim by name without a cross-section or dimensions.
- Assuming all ridge, rake, valley, or sidewall pieces are universal.
- Forgetting roof pitch or panel rib height.
- Using sealant instead of a properly layered flashing detail.
- Leaving closures, cleats, butyl tape, or stitch fasteners off the order.
- Reversing the finished face on custom trim.
- Failing to plan laps, corners, end conditions, or long-piece transportation.
Order Roofing Panels and Custom Trim Locally
Sullins Metal & Siding Supply serves contractors and property owners from Aragon, Rockmart, Cedartown, Rome, Cartersville, Dallas, Calhoun, Bremen, and surrounding Northwest Georgia communities. Review our metal roofing supplies and gutter supplies, or use the contact page to send your material list and project details.
Call 770-684-8354 before ordering to confirm current specifications, colors, profiles, fabrication details, lead times, and availability. For help preparing the rest of the order, use our metal roofing panel and custom trim ordering guide.