Valleys are one of the most vulnerable parts of the roof. Marley Universal GRP dry valleys provide totally weathertight detailing that is fast and easy to install and compatible with all Marley concrete, clay plain and interlocking tiles. Please note this is compatible with the Marley modern, duo modern, Edgemere, duo Edgemere, Ashmore and plain tiles. Simple, rapid and fast to install. Dry fix, mortar free system for a long, maintenance-free life. Can accommodate up to 20-degree pitch variance on either side of the valley. Can be used on up to 60-degree pitches. Gives a finished appearance of a close cut roof.