The roof ridge, also known as the roof peak or roof crest, is an important structural component of a roof. It is the highest point on the roof where two sloping roof surfaces meet to form an inverted “V” shape. The ridge runs the entire length of the roof, from one gable end to the other, forming the peak.

What Is the Purpose of a Roof Ridge?

The roof ridge serves several important functions:

Structural Support

The ridge provides critical structural support for the roof frame. It ties together the ends of the rafters to create a ridged apex that bears the weight of the roof and allows the slopes on either side to maintain their pitch and structural integrity. Without the ridge, the roof would collapse in the middle.

Weather Protection

The ridge caps off the high point of the roof to help protect the interior from outdoor elements. Shingles overlapping along the ridge create a waterproof barrier that prevents rain, snow, and debris from penetrating the roof deck. The sealed ridge prevents moisture ingress into the attic or living space.

Ventilation

Many roof ridges are designed to facilitate natural airflow and ventilation. Open ridge vents allow hot air to escape from the attic area, keeping the attic cooler while preventing moisture buildup. Static vents along the ridge also promote air circulation under the roof sheathing.

Aesthetic Accent

On many home styles, the roof ridge serves as an architectural focal point and design detail. It creates visual appeal and accentuates the overall roof shape and lines. Capped ridges with shingles or metalwork can enhance the roof’s aesthetic.

What Are the Different Parts of a Roof Ridge?

A roof ridge is made up of several components working together:

Ridge Board

The main structural member of the ridge is the ridge board, also called a ridge pole or ridge beam. This is a heavy wooden board, metal I-beam, or laminated beam that runs the ridge’s entire length. Rafters are nailed into the ridge board to meet at the peak.

Rafters

Rafters are angled roof framing members that extend from the roof edges and meet at the ridge board. By tying into the centralized ridge board, the rafters create the roof’s triangular gable ends and slopes.

Ridge Cap Shingles

The external ridge covering is composed of ridge cap shingles, overlapping shingles designed to protect the ridge board and sheathing. Ridge caps have an angular profile to match the roof’s pitch. They interlock and overlap along the ridge line.

Ridge Vent

Many ridges incorporate a continuous static vent or open slot vent along the ridge underside to allow hot air to escape the attic. These ventilation systems are hidden by the exterior ridge caps.

Ridge Caps

For decorative flair and increased weather protection, some ridges have metal caps installed over the shingles. Copper, galvanized steel, and terne-coated stainless steel are common ridge cap metals.

Sheathing

Sheathing boards or roof decking provide a substrate for shingles along the sloped sides and ridge. This sheathing may be plywood, OSB, or boards.

What Are Some Different Ridge Materials?

Ridges may be constructed from various materials, depending on roof type, climate, and desired aesthetics.

Wood

A dimensional lumber ridge board provides structural strength. Pine, cedar, and pressure-treated boards are common wood ridge materials. Wood is affordable but susceptible to moisture and decay over time.

Metal

Galvanized steel, copper, and aluminum are used for both structural ridge beams and decorative ridge caps. Metals are durable, low maintenance, and weather-resistant.

Asphalt Shingles

Asphalt shingle ridge caps are the most common material used to cover and waterproof roof ridges. Their layered construction creates durability.

Concrete

Some commercial roofs or unusual residential designs employ concrete ridges for a seamless appearance. These are precast and set atop the roof system.

Clay

On tile roofs, decorative clay ridge tiles match the roof tiles while sealing the ridge. Mortar is used to adhere the overlapping clay units.

Slate

Slate shingles are handcrafted into angular ridge caps atop natural slate roofing. This is beautiful but expensive.

PVC

Lightweight PVC plastic ridge caps attach easily over asphalt shingles and mimic the look of wood or slate while resisting moisture.

Masonry

Some roof ridges are finished with a masonry design for ornamental flair. Stone, brick, and tile effects are created.

How Are Shingles Installed on a Roof Ridge?

Installing shingles along the angled roof ridge takes skill and precision. Here is an overview:

Once roof sheathing is complete, starter shingles are applied along the bottom edges on both sides of the ridge.
Standard shingles are then laid in overlapping rows up both sloped sides of the roof. An opening is left along the ridge.
Ridge cap shingles designed for ridge installation are placed along one side of the open ridge slot. Nails are driven at the top of each cap.
The ridge caps are then overlapped by a second row placed along the opposite ridge side. This creates the layered, alternating pattern.
Ridge shingles should overlap neighboring caps by 5-6 inches for proper water protection. The overlapping joints are sealed with roofing cement.
Flashing and seals are used along the junction of the ridge and roof planes to prevent moisture entry. Metal drip edges may also be installed.
The final ridge row is set flush with the roof’s edges for a clean line. Ridge vents can be integrated between the deck and ridge caps.

What Are the Different Ridge Styles?

Ridge design makes an important architectural statement. Primary styles include:

Open Ridge

An open ridge utilizes a central exposed beam as the accent, without any covering caps. This industrial look allows ventilation.

Closed Ridge

A closed ridge has shingles or metal caps enclosing the full length of the peak. This provides weather protection but blocks ventilation.

Arched Ridge

Arched or curved ridges have an elegant rounded shape rather than an angular peak. Any roofing materials can be bent to follow the curve.

Cross Gable Ridge

When two gable roof sections intersect perpendicularly, they form a cross gable with ridges at right angles.

Hip Ridge

A hip ridge occurs where two roof slopes meet at an angle rather than a peak, forming a trapezoidal hip shape outlined by the ridge.

Sawtooth Ridge

Sawtooth ridges zigzag up and down at the roof peaks of some industrial buildings with angled sawtooth bays.

How Do You Measure and Cut Ridge Shingles?

Achieving a professional ridge look requires taking careful measurements and making precision cuts:

Start by measuring the total length of the roof ridge from end to end. Add 6-12 inches to allow for overhang.
Mark and cut each ridge shingle to match the total ridge length before installation.
Use tin snips to cut metal ridge caps to length as needed. Cut slate or clay pieces with a masonry blade.
To achieve the proper ridge angle, measure the roof slope and cut shingles or blocks to match. A steep 8/12 pitch requires steeper-angled caps.
Ridge shingles should be cut evenly in relation to one another and to the angles of the roof slope.
Each shingle should overlap the one below it by at least 5 inches for adequate runoff protection.
Avoid ridge shingles that are too short or misaligned, as these can break the ridge seal and cause leaks.

How Much Does a New Roof Ridge Cost?

Installing a new roof ridge will incur costs for materials, labor, and any repairs needed:

Ridge material prices range widely, from $2-$10 per foot for wood; $4-$12 for laminated ridge beam; $3-$25 for metal caps; $5-$15 for shingles. Unique slate or tile add more cost.
Labor will account for 50-70% of the total ridge replacement cost. Expect to pay $300-$700 for installation.
If the ridge board or rafters are severely decayed, repairs will cost $200-$2000 before the new ridge is installed.
The total cost to replace an average 30′ asphalt shingle ridge is $1200-$3000. Longer or more complex ridges cost more.
Factors like roof height, access difficulty, and disposal fees can all drive up costs. Always get multiple quotes.

What Are Some Ridge Vent Pros and Cons?

Ridge vents provide ventilation but have some limitations:

Pros:

Improves airflow and removes hot air from attics
Prevents moisture buildup and reduces energy bills
Less visually obvious than roof or gable vents
Easy to install along ridge line

Cons:

Can allow in snow, rain, and bugs without a baffle
Not as effective in very cold climates with insulation
Vulnerable to wind damage or blockage
Can short-circuit ventilation design without soffit intake vents

How Do You Maintain and Repair a Roof Ridge?

Regular ridge maintenance is essential for getting the longest roof life possible:

Inspect the ridge at least yearly for cracked, warped, or missing shingles, exposed nail heads, or gaps opening up along the peak.
Reseal any new cracks or separations with roofing cement to prevent leaks.
Replace individual damaged or lifted ridge caps as soon as possible to maintain coverage.
Clear debris from ridge vents regularly.
Check flashings around the ridge for deterioration and reseal as needed.
When ridge shingles start showing significant curling, wear, or loss of granules, it’s time for full ridge reshingling.
For an aging ridge board, apply protective treatments to subdue minor rot, or replace majorly decayed boards.
If roof rafters attaching to the ridge are compromised, sistering new rafters alongside may suffice, or full rafter replacement may be required.

What Are Some Common Roof Ridge Problems?

Some issues to watch out for with roof ridges:

Ridge sag: A sagging ridge indicates structural deficiency. Reinforce the ridge board and evaluate the rafters.
Shifting ridge: If the ridge line is moving off-center, structural components likely need repair.
Leaks: Gaps in ridge caps allow water intrusion. Check for damaged or loose shingles.
Moisture: Condensation beads on the sheathing signal poor attic ventilation. Improve airflow.
Insects/pests: Wasps, birds, and rodents are attracted to open ridge gaps. Seal openings.
Moss ridges: Moss indicates too much shade and moisture. Improve sun exposure and drainage.
Wind damage: High winds will easily lift poorly attached ridge caps. Use proper ridge seals.

FAQs About Roof Ridges

What is the purpose of a roof ridge?

The roof ridge serves as the peak or crest of the roof, providing structural support, weather protection, ventilation, and architectural style. It brings together the angled roof planes.

What materials are used for roof ridges?

Common ridge materials include wood, asphalt shingles, metal, slate, clay tiles, PVC, and masonry finishes. The ridge design matches the roofing type.

How do you know if your roof ridge needs replacing?

Look for damaged, missing, cracked, curled, or loose ridge shingles. Severe moss growth, sagging ridges, and gaps opening up are also signs it’s time to reshingle the ridge.

Can you replace just a section of roof ridge?

It’s possible to spot replace portions of ridge, but it’s best to reshingle the entire ridge for a seamless appearance and water protection.

How long does a roof ridge last?

With proper installation and maintenance, a ridge should last as long as the roof itself, generally 15-25 years. Wood ridges may need replacing sooner.

Should attic insulation cover the roof ridge?

Attic insulation should leave the ridge area clear for ventilation. Do not pack insulation over the ridge vent.

How do you seal a roof ridge?

Roofing cement, ridge sealant tape, and ridge flashing help seal the ridge caps. Close any gaps, overlapped shingles by at least 5 inches, and secure with nails.

What is the average cost to replace a roof ridge?

Expect to pay $1200-$3000 on average to replace a 30-foot asphalt shingle ridge. Costs go up for longer ridges, more complex projects, or premium materials.

What causes a wavy roof ridge?

A wavy ridge is usually due to deterioration and sagging of the wooden ridge beam. This requires replacement of the ridge support structure.

How do you stop rain coming in through the roof ridge?

Check for lifting shingles, gaps, cracks, or holes along the ridge line that allow water intrusion. Reseal openings and replace damaged shingles to prevent ridge leaks.

Conclusion

The roof ridge is one of the most important functional and architectural elements of a roof system. This peak or crest where the sloped roof planes join together provides critical structural support while also bracing the roof against weather, sealing the high point of the roof, and adding beautiful design interest. Maintaining the ridge is essential to preserve roof integrity and prevent leaks as a home ages. By understanding what a roof ridge is, how it functions, and how to care for it, homeowners can keep their roofs happily standing tall for years. With routine inspections and repairs, the roof ridge can remain a sturdy, attractive asset.

What Is a Metal Roof Ridge Cap?

A metal roof ridge cap is a versatile metal covering designed to seal, protect, and enhance the roof ridge. Ridge caps create a finished look along the roof’s peak while shielding the ridge from weather damage.

What Are the Benefits of a Metal Ridge Cap?

Metal ridge caps offer many advantages over other ridge materials:

Durability: Metal can last 50 years or longer with minimal maintenance. The ridge remains watertight.
Strength: Metal withstands high winds, storms, snow loads, and temperature extremes. It resists cracking or breaking.
Fire resistance: Metal is non-combustible for fire safety.
Versatility: Metal comes in different colors and styles to match any home.
Lightweight: Metal caps are easy to lift onto roofs compared to heavy tiles or masonry.
Low maintenance: Metal won’t rot, warp, or decay over time. It resists mildew and pests.
Weathertight: Tight metal seams prevent moisture intrusion, ice dams, and leaks along the ridge.

What Metals Are Used for Ridge Caps?

Common metals used for roof ridge caps:

Galvanized steel – This corrosion-resistant steel with a zinc coating offers durability at a low cost.
Aluminum – Lightweight, rustproof aluminum is easy to cut and form for custom ridges.
Copper – Copper develops a distinctive patina but is expensive. It lasts a century or more.
Stainless steel – Durable stainless steel resists rust and provides a modern look.
Lead – Traditional and watertight, lead has fallen out of favor due to toxicity.
Titanium – Extremely strong and weather-resistant, titanium justifies its high cost only for unique architectural homes.

What Are the Different Styles of Metal Ridge Caps?

Metal ridge cap styles include:

Rounded ridge caps – These curved caps work on barrel roofs and create a sleek finish.
Open ridge caps – With gaps between overlapping panels, these allow airflow along the ridge.
Standing seam ridge caps – The vertical seams between long panels add strength and height.
Low-profile ridge caps – These flat, tight-fitting caps provide a minimalist ridge appearance.
Corrugated ridge caps – – Ridges with a wavy, corrugated shape refract light uniquely.
Vented ridge caps – Perforations in the metal allow for airflow and ventilation.
Decorative ridge caps – Ornate metalwork like finials and scrolls embellish the ridge.

How Are Metal Ridge Caps Installed?

Proper metal ridge cap installation is important:

Old ridge shingles are first removed and roofing felt is installed along the ridge opening.
Metal panels are measured and cut to size, allowing for overhang past roof edges.
Caps are placed along one ridge side with exposed fasteners into the roof sheathing. Spacing between panels allows for expansion.
The opposite ridge caps are then installed, overlapping the first row. Overlaps should face away from prevailing wind direction.
Caps are attached into solid decking with nails, screws, or clips. Seams are sealed with caulk.
Flashing is used to seal the transitions between roof and ridge planes. The edges are trimmed for a clean finish.
Paint touch-ups cover any scratches or nail holes. The finalized ridge should have water-shedding laps and be rust-free.

What Are Some Pros and Cons of Metal Ridge Caps?

Pros

Extremely durable in all weather
Resists leaks, bugs, rot, and mold
Long lifetime with minimal upkeep
Stylish accent that increases home value

Cons

Higher upfront cost than asphalt shingles
Noise during rainstorms can be loud
Careful installation required to prevent leaks
Occasional repainting needed to prevent rust

What Is a Roof Ridge?