The Property

Lead Capping to Parapet Wall – York, North Yorkshire

This project involved the supply and installation of a new lead capping to a parapet wall on a commercial property in York city centre. The main roof covering had been formed using a single ply membrane by our client, with The Lead Lads engaged to complete the specialist perimeter capping detail.

The leadwork was primarily required for visual finish and long-term weather protection. Parapet wall cappings are highly exposed details, so the finished covering had to be neat, secure and capable of resisting wind uplift while allowing natural thermal movement.

Working in central York required careful planning. To reduce time on site, the leadwork was accurately measured and prepared off site before being transported for installation and final finishing.

Why the Lead Capping Was Needed

Parapet walls are vulnerable to water penetration if the top of the wall is not properly protected. Poorly detailed cappings can allow moisture into the masonry, leading to staining, frost damage, decay and deterioration of adjoining roof finishes.

On this project, the new Code 5 lead capping provided a durable and visually appropriate finish to the perimeter wall. Continuous stainless steel clips were used to secure each edge, helping to reduce the risk of wind uplift in an exposed roof position.

Leadwork Standards and Technical Approach

This project was completed using a standards-led approach focused on correct material selection, neat panel formation and secure perimeter fixing.

• BS 6915 informed the installation and fixing principles for the lead capping.
• BS EN 12588 governed the rolled lead sheet material specification.
• Lead Sheet Association guidance informed panel sizing, welted joint formation, clipping, welding and movement allowance.

The key principle was to form a clean capping detail that could be installed efficiently on site while maintaining proper movement allowance. The lead was formed in welted panels, clipped continuously to each edge and welded at abutments where required.

Specification of Works

Preparation and Removal

• Parapet wall dimensions carefully measured before installation.
• Lead panels set out and prepared off site to minimise disruption in York city centre.
• Access scaffolding arranged by the principal contractor for safe working.
• Abutment and interface areas checked before fitting the new lead capping.
• Working areas prepared for installation of clips, panels and welded details.

Substrate and Support

• Parapet wall head checked for suitability before lead installation.
• Support and fixing positions set out to suit the lead capping panels.
• Continuous edge clip locations prepared to both sides of the capping.
• Interface points coordinated with the single ply roof covering and abutment details.

Leadwork Installation

• New perimeter capping formed using Code 5 rolled lead sheet.
• Lead capping panels transported to site ready for installation.
• Welted panels formed to provide neat joints and controlled movement.
• Continuous stainless steel clips fitted to each exposed edge.
• Copper clips used where appropriate to secure the leadwork.
• Interface flashings formed to abutments where necessary.
• Welded lead details formed at abutments and changes in direction.
• Finished capping checked for alignment, edge security and visual consistency.

Finishing and Protection

• Patination oil applied to exposed lead where required.
• Completed capping inspected for fixings, welds and weathering.
• Surrounding roof areas cleaned down after installation.

The Materials

This project used a focused set of materials selected for a clean, durable and secure parapet capping detail.

• Code 5 lead
• Copper clips
• Stainless steel clips
• Patination oil
• Lead welding materials

If you are trying to understand which code of lead is right for a similar detail, our shoppable lead chart is a useful starting point. For broader product learning, see The Lead Handbook and our lead roofing guides.