Timeline Photos Why do we recommend open cut valleys, rather than closed cut or woven valleys?
✅longevity
✅durability
✅better drainage
An open cut valley consists of a metal flashing, ice and water shield underlay, and shingles cut exposing the metal flashing. The exposed metal flashing can better handle the excess water flow of 2 or more roof sections coming together, and allows for quicker runoff of rain water or melting snow and ice. We strongly recommend this method for a longer lasting roof, although some unique roof designs require a closed valley for functional reasons.
A closed cut or woven valley conceals the metal flashing by weaving the shingles, or extending the shingles up the higher slope and overlaying the shingles from the higher slope.(assuming that the contractor still installed the metal flashing as required by code). In many cases roofers will install closed valleys over the ice and water shield only, although building code and shingle manufacturers still recommend the metal flashing to be installed. This is typically done as a way to cut time and costs.
The drawback to closed valleys is that they depend on the shingles to act as the transition flashing, now being exposed to twice as much or more water flow than the rest of the shingles on the roof. The result is the shingles in the valleys wearing out YEARS faster than the rest of the roof, resulting in functional and cosmetic failures.
Additionally, having shingles instead of metal flashing in the valley transition slows the flow of water and other debris such as leaves and dirt, which can result in blockages or act as a catalyst for ice damming issues in the winter.
While some customers may prefer the appearance of a closed style valley it is important to know the pros and cons, and to make sure that regardless of style all of the correct components are used.
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