A metal roof ridge cap is the formed metal trim that closes the peak where two slopes meet, sealing out water while letting the panels breathe. It is the last piece installed on a metal roof, it laps over the top of the panels on both sides, and it relies on closure strips underneath to block wind-driven rain, insects, and debris. Standard ridge cap ships in 10-foot 6-inch lengths that cover 10 feet of ridge with a 6-inch overlap, and in 2026 the trim runs roughly $1.50 to $7.50 per linear foot depending on metal and finish.
What is a metal roof ridge cap?
A metal roof ridge cap is a length of pre-bent metal that sits over the ridge, the horizontal peak line at the top of a gabled or sloped roof. It bridges the open gap between the panel ends on each slope, sheds water down onto the field panels, and holds the closure strips that seal the ribs. Without it, the peak is the single most likely place for a metal roof to leak.
The cap is a trim accessory, not structural. It fastens to the panels and their high ribs, never to open decking, so it moves with the roof as the metal expands and contracts. Manufacturers such as Western States Metal Roofing, ABC, and Best Buy Metals sell ridge cap in the same coatings and colors as their panels so the peak matches the field.
Ridge cap vs ridge vent vs ridge cap shingles
These three terms get mixed up constantly, and they are not the same part. A ridge cap is the metal trim. A ridge vent is an exhaust opening that lives under a vented cap. Ridge cap shingles are bent asphalt shingles used on a shingle roof, not a metal one. Buying the wrong one is the most common ordering mistake at the supply counter.
| Part | What it is | Where it goes |
|---|---|---|
| Metal ridge cap | Formed metal trim over the peak | Ridge of a metal panel roof |
| Ridge vent | Continuous exhaust opening under the cap | Ridge, over a cut slot in the deck |
| Ridge cap shingles | Individual bent asphalt shingles | Ridge of an asphalt shingle roof |
If you are working on a shingle roof, the part you want is ridge cap shingles, which install and price out very differently from metal trim.
Types of metal ridge cap
Metal ridge cap comes in several profiles, and the right one depends on your panel type, roof pitch, and whether you want ventilation. Most exposed-fastener roofs use a simple folded cap, while standing seam and architectural roofs often use a raised or rounded profile. Vented versions add a baffle so air can exhaust at the peak without letting rain in.
| Type | Profile | Best for |
|---|---|---|
| Standard folded (tapered) cap | Inverted V with hemmed edges | Most gable exposed-fastener roofs |
| Vented ridge cap | Raised cap with an external baffle and net free area | Roofs needing continuous exhaust ventilation |
| Transition ridge | Steps to match a pitch change at the ridge | Roofs where the slope changes at the peak |
| Round or bullnose ridge | Curved half-round cap | Standing seam and architectural roofs |
| Flat cap with Z-closure | Flat metal over a Z-shaped bar | Low-slope and mono-slope metal roofs |
For how the cap fits with the rest of the peak hardware, see every part of a metal roof system named in one place.
Do you need closure strips under the ridge cap?
Yes, in almost every case. Closure strips are foam or metal fillers shaped to the exact panel profile that seal the gap between the ribbed panel and the flat underside of the cap. Skip them and wind-driven rain, snow, insects, and debris blow straight under the cap into the attic. They are cheap insurance, usually $1 to $3 per linear foot.
Closures come in two functional types. Solid closures block airflow completely and suit a non-vented ridge. Vented closures have open channels that let air exhaust while still stopping rain, and they pair with a vented cap. Each is molded to a specific profile, so a closure cut for a 5V panel will not seal a corrugated or standing seam panel. Seat closures in a bead of butyl sealant tape so they cannot slide or leak at the ends.
Sizing, overlap, and how much you need
Standard metal ridge cap pieces are 10 feet 6 inches long and cover 10 feet of ridge, because the extra 6 inches is the lap onto the next piece. To estimate quantity, measure the total ridge length in feet, divide by 10, and round up. A 30-foot ridge needs three full pieces plus closures for both slopes.
The 6-inch overlap always faces away from the prevailing wind so rain cannot drive into the seam. Bed each lap in butyl tape and fasten through the overlap so both pieces lock together. Order closure strips by the linear foot of ridge for each slope, meaning a 30-foot ridge needs 60 feet of closure total.
What gauge and metal, and the galvanic corrosion trap
Match the ridge cap to the panel in both metal and gauge. Most residential metal roofs use 26 or 29 gauge steel, so the cap should be the same. The bigger risk is mixing dissimilar metals: pairing bare copper flashing with a steel or aluminum panel sets up galvanic corrosion that eats the less noble metal over time, especially in wet or coastal air.
The safe rule is to use a ridge cap of the same metal and coating as the panels. Galvalume caps match Galvalume panels, aluminum with aluminum, copper only with copper. Fasteners should also be compatible; most manufacturers specify coated or stainless gasketed screws so the fastener itself does not corrode against the panel.
How much does a metal roof ridge cap cost in 2026?
Metal ridge cap trim runs about $1.50 to $7.50 per linear foot in 2026, driven mostly by the metal and finish. Galvanized steel is the budget option near $2.50 per foot, Galvalume runs $3.50 to $7.50, and copper starts around $10. A full vented ridge cap system installed by a contractor typically costs $10 to $14 per linear foot, since it adds the vent and the labor to cut the slot.
| Component | 2026 price | Notes |
|---|---|---|
| Galvanized steel cap | ~$2.50 / linear foot | Most affordable trim |
| Galvalume steel cap | $3.50 to $7.50 / linear foot | Matches most steel panels |
| Aluminum cap | $3.00 to $6.00 / linear foot | Coastal, no red rust |
| Copper cap | $10+ / linear foot | Premium, patinas over time |
| Foam closure strips | $1 to $3 / linear foot | Solid or vented, by panel profile |
| Butyl sealant tape | $20 to $50 per 30-foot ridge | Under laps and over closures |
| Vented ridge cap system (installed) | $10 to $14 / linear foot | Adds continuous ridge exhaust |
Materials alone for a typical 30-foot ridge land around $150 to $450, plus $20 to $50 for tape and closures. The ridge cap is a small line item on a full metal roof; for where it fits in the overall parts list, see the complete metal roofing accessories catalog.
How to install a metal roof ridge cap
Ridge cap goes on last, after both slopes of panels are set. The job is straightforward but unforgiving of shortcuts: skip the closures or fasten into the flats and the peak will leak. Work from one gable end toward the other so laps shed water in the right direction.
- Confirm the panels run to within about an inch of the ridge on both slopes, and trim any that overrun.
- Snap a chalk line down the ridge and dry-fit the first cap so the 6-inch overlaps will face away from the prevailing wind.
- Lay closure strips matched to the panel profile along both slopes, seated in a continuous bead of butyl sealant tape.
- Set the first ridge cap piece and fasten through the panel high ribs into the closure, never through the flat pans where water collects.
- Lap the next piece 6 inches over the first and bed that lap in butyl tape before fastening.
- Drive matching gasketed screws at the manufacturer spacing, commonly every 12 to 24 inches, snug but not crushing the washer.
- Seal the cap ends, cover any exposed fasteners, and check the run for gaps or oil-canning before you come off the roof.
The full install kit and cut tools overlap with the rest of a panel job; the panel profiles compared guide shows which cap and closure pair with each panel.
Vented ridge cap and ventilation balance
A vented ridge cap turns the peak into a continuous exhaust for attic air, which lowers summer heat, cuts winter condensation, and reduces ice dam risk. It only works if intake at the eaves roughly equals exhaust at the ridge. The standard target is a 1:1 balance of net free intake to exhaust area, sized to the attic under the IRC 1:150 or 1:300 ventilation rule.
A vented cap needs a slot cut in the deck along the ridge, usually 1 to 2 inches back from center on each side, then vented closures instead of solid ones. If your intake is weak, adding a vented ridge cap alone will not fix the attic. For the slot cut, net free area math, and soffit pairing, see the guide to ridge vent installation.
Reviewed by The Roofing Brief Team. Last reviewed July 2026.