Metal Valley Guide

Metal valleys are one of the most important parts of a roof, but also one of the most overlooked. There are more options behind them than most homeowners realize, and the choices made here affect both long term performance and how clean the roof looks.

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What to Consider

There are a few key variables that come into play with metal valleys that most homeowners never think about. Profile, installation method, and metal thickness all affect how the valley performs and how it looks. Most commonly stocked colours are brown, black, and white. Specialty colours are available, but are typically special order.

Common Colours

Brown, black, and white are the most commonly stocked valley metal colours.

These are what you will see on most homes simply because they are readily available and easier to match. Specialty colours are possible, but usually need to be ordered in.

Profiles

The two main profiles are V valley and W valley.

The profile changes both water control and rigidity. W valley adds a center rib that helps with water separation and gives the metal more structure.

Installation Style

Valleys are commonly installed as California valleys or open cut valleys.

This has a major effect on both appearance and detail level. One is more common regionally, while the other is generally the cleaner and more recommended method.

Metal Thickness

Metal thickness matters more than most people realize.

Thicker metal tends to hold its shape better and is less prone to waviness, distortion, and movement over time, especially when temperature changes and fastening pressure come into play.

Profiles & Installation Styles

Not all valleys are built the same. The profile of the metal and the way the shingles are run through it both change how the roof looks and how refined the finished system feels.

Base

V Valley

V valley is the more basic profile. It still brings the main benefit of metal valley, which is giving water a defined and durable path through one of the heaviest water channels on the roof.

That alone is a major advantage over treating the valley area with shingles alone. It works, it is common, and it gets the job done.

But beyond that, it does not add much extra structure or water separation compared to a W valley.

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W Valley

W valley takes the same core benefit of metal valley and improves on it. The raised center rib helps separate water better and adds noticeable rigidity to the metal itself.

That added structure helps the valley hold its shape better and makes it feel more deliberate overall. It is a better profile, plain and simple.

It is one of the clearest signs that more thought went into the sheet metal side of the roofing system.

Base

California Valley

California valleys are very common in Kelowna and they do have a track record of working in this region. That said, they come with drawbacks.

They tend to create a more humped appearance where the bleeder shingle and field shingles meet, and the finished valley usually looks less smooth and less clean.

They are also not manufacturer recommended, are banned in some jurisdictions, and some manufacturers state they may not be suitable on lower slopes such as under 6:12.

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Open Cut Valley

Open cut is the cleaner and more refined method. It is the manufacturer and industry expert recommended way to run a valley, and it tends to look much more intentional once finished.

The valley line looks smoother, flatter, and more seamless because you are not stacking the same buildup into the center of the valley.

It also reduces some of the visual and occasional buckling issues that can happen when valley metal is overly constrained, over fastened, or fighting against uneven layered buildup.

Common Valley Issues

Most valley problems don’t show up right away. They develop over time from small decisions during installation, especially around fastening, material buildup, and how the metal is allowed to move.

Oil Canning

Waviness in the metal caused by thinner gauge material, over fastening, or restriction of natural movement.

Material Build Up

Excess layering in the valley creates a raised or uneven appearance, especially common with California valleys.

Buckling

When metal cannot expand and contract properly, it can warp or distort over time under temperature changes.

Shearing

Movement stress can cause fasteners or seams to shift or tear, especially when the system is too rigid.

Lifting

Improper fastening or poor integration with shingles can allow edges to lift or separate over time.

Fasteners Too Close

Nails placed too close to the valley center increase leak risk and restrict proper water flow.

Uncut Shingle Tips

Shingles not having corners clipped (dogs ear) can fail to direct water into the valley and instead towards the metal seam.

Over Fastening

Too many fasteners lock the metal in place and prevent natural expansion, leading to distortion and stress.

Build a Roofing System That Actually Performs

Metal valleys are one of the most critical components of your roof. The difference comes down to how the system is built, not just what is installed.

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