Lead Bay Roof Repair

🔎 What Is a Lead Bay Roof?

A lead bay roof is typically installed over projecting windows or bay window structures, often found on Victorian, Edwardian, and interwar-period properties. These roofs are usually finished in Code 5 or Code 6 lead sheet, and feature a warm or cold roof build-up depending on the original construction.

Lead bay roofs are not just functional — they are an integral part of the architectural fabric of many York homes, and poor repairs can lead to extensive damage to windows, sills, or internal finishes.

⚒️ Our Lead Bay Roof Repair Process

1. Initial Inspection and Assessment

We start with a detailed roof survey of your bay roof area. This includes:

• Visual inspection of the lead sheet for cracks, splits, or creep
• Assessment of substrate integrity (boards, firrings, or insulation)
• Evaluation of flashing junctions and upstands
• Internal checks for signs of water ingress

2. Removal of Failed Materials

Old or damaged lead is carefully removed, and all substrate components are inspected and replaced if necessary. This includes:

• Ply or softwood boards
• Insulation layers (for warm roof systems)
• Underlays or ventilation membranes

3. Leadwork to BS6915 & LSTA Standards

We replace lead sheets using the correct Code (usually Code 5 for bay roofs) and install them in accordance with:

• BS EN 12588 (Lead sheet specification)
• BS 6915 (Design and installation of fully supported lead sheet roofs)
• LSTA Rolled Lead Sheet Guidelines

All bays are formed with proper lap lengths, step joints, drips, and welts where appropriate. Flashings are replaced or dressed into brickwork using hall clips, lead wedges, and pointed with lime or polymer-modified mortars as appropriate.

4. Ventilation and Breathability

In accordance with modern building guidance, we assess whether the bay roof requires:

• Cross ventilation (in cold roofs)
• Breathable membranes
• Warm roof detailing with insulation over joists

We take particular care to avoid condensation risks in cold roof build-ups, especially where internal heating causes temperature fluctuations.

🧱 Substructure & Roof Build-Ups

Lead bay roofs may be built in different ways depending on the property’s era:

We use Kingspan, Celotex or mineral wool insulation as appropriate to the build-up and performance requirement.

👷 Specialist Support from GNR Roofing & The Lead Lads

For complex lead detailing, such as deep gutters, rolled bays, or ornate flashing terminations, we collaborate with leading local specialists:

• GNR Roofing Ltd – Advanced lead roofing and hard metal installations
• The Lead Lads ® – Experts in traditional leadwork and conservation detailing

We may subcontract specific elements to these teams to ensure the highest standards of craftsmanship and longevity. All works are managed by Roof York and covered by our warranties.

📍 Areas We Cover

We deliver lead bay roof repairs in:

• York (Clifton, Fulford, Acomb, Heworth, Bishopthorpe, etc.)
• Selby
• Wetherby
• Tadcaster
• Harrogate
• Malton
• Easingwold

📞 Book a Survey Today – Get Expert Lead Bay Roof Repairs in York

If your bay roof is leaking, split, or simply outdated, contact Roof York today for a free site inspection and repair plan.

✅ BS-compliant installation
✅ Lime mortar pointing
✅ Code 5 or 6 lead detailing
✅ Reclaimed accessories available
✅ Heritage and modern roof compatibility