Protecting the Most Vulnerable Part of Your Roof
When it comes to slate roofs, most leaks don't start on the open slope — they start in the valleys and abutments, where two roof sections meet or where the roof meets a wall. These junctions channel huge volumes of rainwater, and if they're not sealed properly, water finds its way in fast.
On a recent job, our team tackled exactly this problem: a slate roof valley and wall abutment gutter that needed a full waterproofing repair.
The Problem: Vulnerable Valley and Abutment Gutters
Valleys and abutment gutters sit at the lowest points of a roof, meaning they carry the heaviest water flow during rain. Over time, exposure to weather can cause:
• Cracked or degraded flashing
• Gaps where mortar has failed at the ridge or hip joints
• Water pooling or channeling behind slates and into the wall
• Slow, hidden leaks that damage timber and internal ceilings before they're ever noticed
Left unaddressed, these small failures can lead to expensive structural repairs down the line.
Our Solution: Professional Bituminous Coating
To resolve this, our team applied a high-performance bituminous waterproof coating along the full length of the valley gutter and up the abutment wall junction. This approach:
• Creates a seamless, flexible waterproof membrane
• Bonds directly to the slate and masonry for long-lasting adhesion
• Withstands UV exposure, temperature changes, and standing water
• Provides an immediate, cost-effective fix without disturbing the surrounding slate
We also re-pointed the ridge and hip joints with fresh mortar, ensuring water is directed cleanly into the gutter rather than seeping into the joints.
Why This Matters for Homeowners
A well-sealed valley isn't just about stopping today's leak — it's about protecting your roof's structure, your walls, and your home's interior for years to come. Regular inspection of these high-risk areas can catch small issues before they become major repairs.
Signs your valley or gutter may need attention:
• Damp patches on ceilings near roof junctions
• Visible cracked or lifted flashing
• Moss or plant growth in the gutter channel
• Discoloured or crumbling mortar at ridges and hips
Get a Free Roof Assessment
If your slate roof has valleys, abutments, or gutters that haven't been inspected recently, don't wait for a leak to appear. Our experienced roofing team can assess the condition of your roof and recommend the right repair — from targeted waterproofing to full re-slating.
Contact us today to book a free, no-obligation roof inspection.
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