Valley Replacement

Roof valleys are among the most critical and most failure-prone areas on any roof. The valley trough concentrates water from two converging roof planes into a narrow channel, meaning it handles a far greater volume of water per square metre than the surrounding roof surface. Over time, the constant water flow — combined with debris accumulation, biological growth, and chemical run-off from roof coatings — can corrode valley iron to the point of perforation, creating a direct leak path into the roof space. Valley replacement involves carefully lifting the tiles or sheets on both sides of the valley to expose the old valley iron. The deteriorated valley metal is removed, along with any corroded underlay or damaged battens. New Colorbond or Zincalume valley iron is then installed with appropriate overlaps at any joins, sealed with silicone at the upper end, and dressed down into the gutter at the lower end. The surrounding roof material is then re-laid over the valley edges with the correct overlap clearance. In Gippsland, valley iron replacement is one of Town & Country Roofing's most commonly requested services. Many homes built from the 1950s to 1980s have original galvanised valley irons that are now 40 to 70 years old and showing significant corrosion. Replacing these ageing valleys with new Colorbond valley iron is one of the most effective ways to stop persistent roof leaks and prevent water damage to the building's interior.