This Cork roofing project involved a failing roof valley that was allowing water to enter the property. We stripped back the surrounding roof covering to expose the defective valley, rebuilt the base beneath it and installed a complete new valley with fresh roofing membrane before reinstating the surrounding slate roof.
ON SITE / 02
Repairing a Failed Roof Valley in Cork
Roof valleys are critical drainage points on pitched roofs. They sit where two roof slopes meet and provide a route for rainwater to travel safely down towards the guttering below.
On this property, the existing valley had deteriorated and water was finding its way into the house. The problem could not be properly addressed by simply sealing the visible surface, so we stripped back the surrounding roof area to expose the existing valley and establish the extent of the failure.
This allowed the defective section to be removed and the valley rebuilt from the base upwards as part of a professional roof repair in Cork.
ON SITE / 03
Stripping Back the Existing Valley
The surrounding slates were removed around the affected area so the existing valley and the materials beneath it could be properly exposed.
Once opened up, the condition of the old valley could be seen much more clearly. This stage also gave our team access to the underlying area required for the replacement rather than trying to carry out a surface-level patch over an already failing detail.
The photograph below shows the old valley after the surrounding roof had been partially stripped back.
A roof valley receives rainwater from the roof slopes on either side. When the valley itself fails, water can reach beneath the surrounding roof covering and enter the property, so the underlying cause needs to be addressed rather than simply covering the visible defect.
ON SITE / 04
Creating a New Timber Base
After the failed valley had been exposed and removed, we installed a new timber base for the replacement valley.
The base provides the new valley with the support and form required before the weatherproofing layers above are completed. Rebuilding this area meant the replacement was not being installed over the defective old valley construction.
ON SITE / 05
New Valley & Fresh Roofing Membrane Installed
With the new base prepared, the replacement valley could be installed and integrated back into the surrounding pitched roof.
Fresh roofing membrane was laid along the adjoining roof areas as part of the work, providing new protective layers beneath the slate covering on either side of the valley.
The photograph below shows this stage particularly clearly: the new valley is in position, with the fresh membrane extending out beneath the surrounding roof area before the slates were reinstated.
What was included in this valley repair?
Existing leaking valley inspected
Surrounding slates carefully removed
Failed valley fully exposed
Defective valley section removed
New timber valley base installed
Complete new valley installed
Fresh roofing membrane fitted
Slate roof covering reinstated
ON SITE / 06
From a Failing Valley to a Finished Roof
The difference is clearest when the exposed failing valley is viewed alongside the finished repair.
Before the work, the surrounding roof had to be opened to reveal the extent of the deterioration. Once the new timber base, valley and membrane were installed, the slate covering was reinstated around the new detail to complete the roof.
THE PROJECT, EXPLAINED
A Properly Rebuilt Roof Valley
The leaking valley was stripped back rather than patched over, allowing us to rebuild the detail from its new timber base upwards. The finished project combines the new valley with fresh membrane and the reinstated slate covering to restore this important drainage point in the roof.
THE PROJECT, EXPLAINED
Why Do Roof Valleys Leak?
A roof valley deals with a concentrated flow of rainwater from two adjoining roof slopes, making it one of the more important weatherproofing details on a pitched roof.
Leaks can develop when the valley material or the roofing details around it deteriorate. Problems can also exist beneath the visible roof covering, which is why identifying the actual source of water ingress matters before deciding how the repair should be approached.
In this case, stripping the area exposed the extent of the failing existing valley and allowed a complete replacement to be installed.
THE PROJECT, EXPLAINED
Can a Leaking Roof Valley Be Repaired?
Yes. A leaking valley does not automatically mean that the complete roof needs to be replaced.
If the wider roof remains serviceable, the affected area can potentially be stripped back so the valley itself and the necessary surrounding roofing materials can be renewed.
The appropriate scope depends on the condition of the individual roof. We also provide roof inspections in Cork where the source or extent of a leak needs to be established before repair work begins.
THE PROJECT, EXPLAINED
Slate Roof & Valley Repairs Across Cork
We carry out valley replacements, leaking roof repairs and slate and tile roofing work throughout Cork.
From localised defects to more substantial pitched-roof repairs, the aim is to identify what has actually failed and carry out work appropriate to the condition of the roof.
For an idea of typical budgets for different types of roofing work, see our roof repair cost guide for Cork. You can also view all areas we cover across Cork.
