Recognise a valley problem
A roof valley is the channel where two pitched slopes meet. Leakage nearby or overflow during rain warrants assessment of both the channel and the roof edges alongside it. Keep observations to safe viewpoints; do not climb up to clear debris.
Find the reason water escapes
Leaves and debris can obstruct flow, but damaged lining, failed joints or adjacent coverings may also be involved. The pattern during rainfall helps: note whether water escapes at one point or along a wider area and whether gutters below also overflow.
Choose an appropriate repair
Clearance addresses an obstruction; it does not repair a split lining or defective detail. A repair proposal should distinguish local work from renewal of the valley lining and explain how the adjoining coverings will be made good.
Plan the work around the roof
Access may require lifting tiles or slates beside the valley. Their condition and compatibility with the repaired detail matter to the finished result. Include associated covering work in the scope, rather than comparing quotations on lining length alone.
Discuss the valley repair
Provide a wider roof photograph if it can be taken safely, the location of any indoor damp and a brief leak history. Mention repeat blockages or earlier patches, as these may point to a recurring drainage or detailing issue.
Your questions, answered.
Can debris in a valley cause a roof leak?+
Yes. An obstruction can divert water, but inspection should also check for damage or unsuitable details.
Does a leaking valley always need a new lining?+
No. The cause and extent determine whether clearance, a local repair or lining renewal is appropriate.
Will tiles beside the valley need to be lifted?+
They may need lifting to access and integrate the repair. The quotation should explain associated covering work.
