Whenever two roof slope or elevations meet inward, it would be considered a valley. This is going to be the area where rain water and snow will be directed to channel down and end up in guttering system.Because of this it is considered a high traffic critical area due to volume of rain water and snow it moves. Water leaks can occur whenever improperly installed by inexperienced roofing contractors or Damaged. To avoid leaks like this it’s recommended to hire reputable roofing contractors to get the job done initially or for repair purposes.