Lead Flexislate 450mm x 450mm Base

The Lead Flexislate offers a premium, weather-tight solution for sealing flue pipes and soil stacks on both flat and pitched roofs. Designed for durability and flexibility, it ensures long-term protection against wind uplift, chatter, and water ingress. Whether you’re working on a traditional tiled roof or a modern flat installation, this product provides a reliable, professional-grade seal. With its strong rubber-to-metal bond and high-grade lead base, Flexislate is built to withstand the elements and deliver dependable performance for over 20 years when installed correctly. It's ideal for a wide range of domestic and commercial applications.

Key Features

Versatile Application: Compatible with all standard pipe diameters and roofing types. Wide Pipe Compatibility: Accommodates pipe diameters from 25mm to 125mm. Temperature Resilient: Suitable for flue pipes operating at temperatures up to 100°C. Superior Weatherproofing: Works effectively on slate, tile, asphalt, felt, and lead roofs. Durable Lead Base: Made from BS EN 12588 Code 4 rolled lead for longevity and strength. Robust Rubber Bond: The neoprene conical upstand is vulcanised at high temperatures and pressure for strong adhesion and long life.

Profile Options

The Lead Flexislate is available in two profile designs to suit different roof angles: Flat Profile – For shallow roof pitches between 0° and 30° Pitched Profile – For steeper roofs with a pitch between 20° and 40° This flexibility ensures the product can be tailored to your specific project, maintaining a tight seal no matter the pitch.

Installation Advice

For a successful and secure installation, always choose the Flexislate profile that matches your roof pitch. If you're sealing around a boiler flue, make sure the pipe's outer surface does not exceed 100°C. The rubber sleeve is marked with concentric grooves—cut to the appropriate size for a snug fit, and use liquid soap to ease it over the pipe. Once the sleeve is in place, apply Prepat or Patination Oil to all visible lead areas to prevent staining and corrosion. On pitched roofs, welt the top edge of the tile for a clean and secure finish.

Health & Safety Guidance

When working with lead, always follow safe handling practices: Keep the product away from children Comply with the Control of Lead at Work Regulations 2002 Wash hands thoroughly before eating, drinking, or smoking Use Premium Metwash Soap and Bodywash to remove any lead residue Lift with care, as lead is dense and heavy

Frequently Asked Questions

1. What types of pipes can the Lead Flexislate seal?

The Flexislate is designed to fit a wide range of pipes, from 25mm up to 125mm in diameter. It’s perfect for soil stacks, boiler flues, and other vertical penetrations through both pitched and flat roofs.

2. Can I use Lead Flexislate on a hot flue pipe?

Yes, the Flexislate is suitable for flue pipes with surface temperatures up to 100°C. If you're working with a boiler flue, ensure the pipe doesn’t exceed this temperature on the outer wall.

3. What’s the difference between the flat and pitched profiles?

The flat profile is suitable for shallow roofs with a pitch from 0° to 30°, while the pitched profile is designed for steeper roofs between 20° and 40°. Choosing the correct profile ensures a proper fit and reliable weatherproofing.

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At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
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Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.

Multiple Products from the Same Supplier

If you're ordering multiple products from the same supplier, your order will be dispatched together once all items are ready. This means the longest lead time will apply.

If you need part of your order sooner, please call us on 01202 113233. We can arrange a split delivery, although an additional shipping charge will apply.