Roof valleys are unsung heroes of home roofing, diverting rainwater and melting snow safely off your roof. When valleys come together, selecting the appropriate Copper valley flashing types means greater waterproof protection with reduced maintenance requirements – from classic open valleys to sleek closed-cut W valleys engineered by professionals or custom-fabricated designs, Copper valley flashing offers beauty, durability and high performance; this guide explores each style so that informed decisions and mistakes are avoided by using best practice strategies employed by roofing pros.
What Is Copper Valley Flashing?
Copper valley flashing refers to long strips (16oz or thicker) placed along roof valleys between slopes where two slopes meet and intended to redirect water, prevent leakage and protect the delicate roof deck underneath it. Copper is considered top tier due to its natural corrosion-resistance forming a self-healing patina over 50 to 100 years with minimal upkeep needed for its care and preservation.
There are two primary valley flashing categories; open and closed–in which copper excels. Furthermore, W-profile flashing and custom fabricated styles add visual interest while providing structured protection with aesthetic flair.
Copper Valley Flashing Types:
1. Open Valley Flashing:
What It Is:
This traditional method leaves copper flashing exposed in the valley. shingles are cut back on both sides to reveal the copper channel underneath.
How It Works:
Installers cleat 16 oz copper sheets to the deck, overlapping by 8″, and secure at the top only. Shingles overhang the metal by at least 6″ to direct water into the valley.
Why It’s Great:
- Outstanding drainage thanks to direct metal exposure.
- Easy to inspect and repair.
- Recommended by roofing experts (e.g., IKO).
Potential Drawbacks:
- Decorative patina may contrast with shingles.
- Debris may collect if not cleaned regularly.
2. Closed-Cut Valley Flashing:
What It Is:
Also referred to as closed valley flashing, this style conceals flashing beneath shingle courses so they meet neatly at the valley center.
How It Works:
Copper is placed under shingle courses, extending 9″–12″ depending on roof slope.
Why It’s Popular:
- Delivers a seamless, shingle-only look.
- Less debris buildup compared to open valleys.
Considerations:
- Slightly lower water flow capacity.
- Shingle edges in the valley may degrade faster.
3. W‑Valley (Diverter-Valley) Flashing:
What It Is:
A specially formed copper valley flange with a raised “W” or “V” rib along its center.
How It Works:
Available in 16 oz or 20 oz copper, typically 18″–24″ wide. The rib enhances rigidity and promotes water flow.
Benefits:
- Structural strength resists warping and foot traffic.
- Ideal for valleys that converge uneven slopes.
- Dual-channel flow prevents overflow in heavy rain.
Drawbacks:
- Higher Material Cost
- Requirement fastening
4. Custom-Fabricated Copper Flashing:
What It Is:
Handcrafted designs tailored specifically for roof geometries, curves or historical styles.
How It Works:
Their fabrication requires custom bends and sectional soldering as necessary.
Advantages:
- Impeccable fit, high-end finish
- Seamless integration into architectural styles
Challenges:
- Costlier and time-consuming.
- Requires skilled craftsmanship.
Comparison Chart:
| Visibility | Water Drainage | Cost | Aesthetic | Maintenance | Valley Type |
|---|---|---|---|---|---|
| Open | High | Excellent | Moderate | Rustic copper rail | Regular cleaning |
| Closed-Cut | Low | Very Good | Moderate | Seamless, clean | Roof shingle check |
| W‑Valley | Medium | Excellent | High | Sculptural ribbed | Occasional check |
| Custom | Visible/hidden | Excellent | Highest | Tailored elegance | Custom care needed |
How to Choose the Right Copper Valley Types?
Roof Slope & Water Flow:
- To maximize drainage on steep or uneven slopes, open or W valleys provide optimal solutions.
- Mild slopes however, closed valleys work if installed well.
Aesthetic Preference:
- Exposed copper provides contrast and character.
- Closed valleys create an elegant roofline that matches budget and labor constraints.
Budget & Labor:
- Custom and W Valleys typically cost more than standard open or closed types.
- Strike a balance between upfront cost and long-term performance.
Maintenance Willingness:
- Open valleys need clearing but provide visibility whereas close valleys do not.
- Valley roofs should undergo roof inspection in order to detect hidden issues.
Real-World Example:
To illustrate, let us look at an example from the Pacific Northwest which experiences heavy rainfall and snow:
Option 1 – Open Valley:
Copper Benching is easy to maintain, while visible copper adds character. Material costs will range between $150-250 for 24”x 10′, including labor.
Option 2 – W‑Valley:
Offers stronger water flow that’s best used on sloped areas like mixed slope angles. These vary between $150-330 depending on gauge width and gauge size respectively, plus labor.
Option 3 – Closed Valley:
provide closed valley options which offer controlled flow ideal for mixed slope angles with mixed slope angles that need drainage solutions.
Maintenance Tips:
- Open valleys: Remove leaves and debris twice annually from open valleys.
- Annual inspection for copper seam corrosion.
- To maintain appearance, natural color develops over time.
- Reapply sealant along overlaps as necessary, If necessary (cracked sealants etc.).
Conclusion:
Selecting the proper copper valley flashing type ensures your roof will stay leak-free, attractive, and long-term. Open valleys are easy to maintain; closed-cut flashes improve aesthetics; W valleys offer structural strength; custom created designs may be better on involved roofs than W valleys due to copper’s century-long the lifespan and ability to combine performance and beauty.
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FAQs
What copper gauge should I choose?
Minimum 16oz weight requirement; use 20 oz on steep or heavy exposure roofs.
Which is better: open or closed?
Open valleys offer superior durability and are preferred by manufacturers like IKO for these reasons.
What advantages does W valley have to offer?
Copper valleys help direct more water, stand up better against traffic flow, and resist deformation better than alternative surfaces such as asphalt.
How long do copper valleys typically last when installed properly?
They have been estimated to last anywhere between 50 to 100+ years when installed correctly.
Can I DIY my copper valley?
Yes, if using proper tools and adhering to cleating, overlap, and sealing guidelines.
Are copper valleys required to be painted?
No, they patina naturally over time to protect the metal.
Should I use sealant?
Yes, apply asphalt plastic cement at overlaps and edges.
How often should open valleys be cleaned and cleared out?
Check and clear at least twice annually or more often near trees, as needed.
Are custom-fabricated valleys worth it?
Absolutely for rooflines with unique structures or to preserve historic detail–but they may cost more.
Will copper flashing increase home value?
Yes, quality upgrades such as copper flashing can increase home resale appeal and thus boost its value over time.
