A roof valley channel sits in the internal angle where sloping roof surfaces meet. It collects rainfall from adjacent slopes and directs it onward towards the lower drainage route.
What does this mean on your roof?
The valley is within the roof geometry and differs from a gutter running along the façade. Its material, adjoining tiles and onward water route belong in the assessment together.
A damp patch beneath it may justify investigation, but does not independently establish where the waterproofing has failed or which component needs replacement.
Repair may require lifting and reinstating neighbouring tiles. Ask whether that work and any underlying components are included in the quotation. Identify the location using an overview of the roof shape so the relevant internal angle is clear. Maintenance access and the condition of adjoining roof slopes deserve separate attention within the proposed scope.
Frequently asked questions
Is a valley channel a downpipe?
No. A valley lies between slopes; a downpipe carries collected water farther downward.
Are surrounding tiles included in valley repairs?
That depends on the method and should be identified in the agreed scope.