Roof valleys — the channels formed where two roof slopes meet at an angle — do a lot of quiet work on Redland's period properties, many of which have more complex roof shapes than a simple modern home. A valley concentrates water from two separate roof planes into a single flow, which means it has to cope with significantly more water volume than an equivalent stretch of open roof slope, particularly during genuinely severe rain. Properties with multiple roof extensions or additions over the years can end up with several valleys, each one a potential weak point that's worth including in any thorough post-storm check rather than assuming the main roof slopes are the only areas of concern.
This concentration of water is exactly why valleys are such a common source of leaks after heavy rain. A weakness that would cause no problem at all on an ordinary roof slope — a slightly displaced tile, a small gap in lead lining, worn pointing — becomes far more significant in a valley, where water is actively channelled directly over and through that same weak point in much greater volume. It's not unusual for a valley leak to appear suddenly during one especially heavy downpour, even though the underlying weakness has quietly existed for some time beforehand.
On older Redland properties, valleys are often lined with lead, which can deteriorate over time in much the same way as chimney flashing — thinning, developing splits, or lifting at the edges where it meets the surrounding tiles or slates. Debris build-up can compound the problem, with leaves and moss gradually restricting the valley's ability to shed water efficiently, increasing the chance of overflow during a genuinely heavy downpour.
Diagnosing a valley leak properly means checking the full length of the valley, not just the point where water appears to be entering, since a weakness anywhere along its length can cause water to back up or find its way through at a different point entirely. This is particularly true where debris has partially blocked the flow, redirecting water to an unexpected part of the valley. A quick clear-out during a routine check can sometimes prevent a valley problem from ever developing into a genuine leak in the first place.
Repair typically involves clearing debris, inspecting the lead lining or tile detailing for damage, and replacing or repairing any sections that have deteriorated. Given how much water passes through a valley during heavy rain, it's not an area worth patching temporarily as a long-term solution — proper repair matters more here than in many other parts of the roof.
Brunel Roofing Bristol repairs valley leaks across Redland properties, with free inspections to trace the source accurately and a 15-year guarantee on the completed work. We'll check the valley's full length as standard, giving you confidence that the repair addresses the whole problem rather than just the visible symptom.
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