Roof Valleys 101

Roofing Tips

Roof Valleys 101

You may not have given much thought to the design of your roof, especially down to the details of what the roof valleys will look like if you are faced with suddenly needing to replace or repair your roof. Roof valleys are the points at which 2 planes on your roof are joined, which channel the water to flow off your roof. Valleys come in three main styles: Closed, Woven, and Open. All three styles are good options, and come down to personal preference when deciding which is better.

Closed Valleys

Closed valleys use the primary roofing material, usually shingle or tile, to cover the valley and give an appearance of continuity across the roof. There are two main styles.

  • Closed Cut Valleys

    The way the tiles or shingles are arranged give an appearance of the entire roof being draped over the surface, with a continuous surface and no sharp edges.

  • Closed Woven Valleys

    The seam where the two planes of roofing meet are aesthetically woven together to form an interlaced design which creates a seam that matches the contours of the roof.

Open Valleys

A roof using the open valley style involves placing a “V” or “W” shaped piece of metal, usually   galvanized or sometimes copper in the seam of the valley and then covered with a base sheet such as 30LB. and either an organic or modified underlayment, depending on whether tiles or shingles are being installed. The two roof planes will stop a few inches short of this to leave the valley open with the waterproof materials exposed.

How to Choose a Roof Valley Style

If you cannot decide which style would suit your roof better, it’s helpful to understand the differences between the main valley types to gain a better understanding of their functionality. One of the first aspects to consider is aesthetics. If you spend some time traveling around your neighborhood looking at the different styles, you can decide which you think would look best on your home. Some people prefer the high-end look of an open valley, which is often used on tile, clay or wood shake. Because of the thickness of these materials open valleys or normal are normally installed.

In terms of functionality, both valley styles are quality options to choose from. Closed valleys protect the roof lining from abrasion that water run-off would cause, and are therefore quite durable options. The main advantage of closed valleys is that they protect the roof from snow and ice build-up, however in Florida this is not an issue that needs to be considered. Open valleys are excellent for preventing moisture from entering through the lining and protecting your roof from the humidity of the outside air. At the end of the day if you have a quality roof installation you will never have to worry about leakages or problems.

Roof valleys are the most sensitive areas of a roof due to constant abrasion from water run-of, especially during rainy season. They can also be damaged by extremely high winds. For these reasons it is important that you keep the roof properly maintained to prevent leaks. If your roof is showing wear or is need of replacement, call AABCO Roofing today and chat with us about the different roof valley options for your home.

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