Open valleys vs closed valleys
There is a great deal of variance in peoples preferences for having their valleys built in a way that exposes the metal called an “open valley”, or choosing to use a California Cut valleys where you cannot see the metal, if there is metal at all.
Here’s our opinion:
Open valleys: Some people prefer the way they look. Thats really about it.
Closed valleys: Most of the roofs that we put on use class 4 hail rated shingles. The valley metal will dent much easier than the shingles that we put on. So in the event of a huge hailstorm, the shingles might be fine but the metal will be dimpled and will not look good anymore.
The choice is pretty clear us: Closed valleys all day with metal, and ice and water beneath it for asphalt shingles unless the manufacture doesn’t recommend it.