All roof valleys should have a layer of ice and water protector beneath the flashing or shingles for protection. In valleys, this layer has to be a minimum of 2-feet wide, though roofers may end up using a full-sized 36-inch roll. Your building code may require it to be wider.

While you have multiple options, the most common type of metal used in open valleys is prefinished steel. But if you want to add more curb appeal to your roof, copper is a popular option. At the end of the day, you should have no roof valley problems as long as they have the right material and are correctly installed.

A roof valley is formed where two roof slopes meet. Water collects in a valley to flow off the roof. Your choice of valley installation method is critical because, when improperly installed, valleys are risks for serious leaks. Essentially, there are three main ways to shingle a roof valley: woven, closed-cut and open.