Deks Fast Flash 5m x 560mm - Flexible Roof Flashing for In-Roof Solar PV

Deks Fast Flash 5m x 560mm is a high performance, self adhesive flashing strip designed specifically for modern in-roof solar PV installations. Made from a durable, lead free material, it offers a fast, clean, and reliable alternative to traditional lead soakers, helping you create a watertight, weather resistant roof interface around your PV array. This 560mm wide black roll is ideal for trade installers and building professionals who want a straightforward, low waste solution that integrates seamlessly with popular in‑roof systems.

Why buy Deks Fast Flash 5m x 560mm?

• Quick, mess free installation thanks to the self adhesive backing and flexible profile.
• Provides a continuous waterproof barrier at the base and top edges of in‑roof PV arrays, reducing the need for metal flashing.
• Lead free and environmentally friendly, supporting modern, sustainable build practices.
• Wide 560mm format covers more coverage per strip, minimising joints and speeding up project completion.
• Designed for long term durability in UK type climates, with proven resistance to UV, temperature extremes, and ozone.

Suitable for

• In‑roof solar PV systems such as SolFiT and GSE in‑roof mounting solutions.
• Roofs with a minimum pitch of 5°, including pitched tile, slate, and some metal profiles.
• Edge flashing at the top and bottom of PV arrays, acting as a continuous sealing strip.
• Roof penetrations and up stands where a flexible, self adhesive flashing is required.
• Professional roofing and solar contractors alongside DIY led installations on accessible, low to medium pitch roofs.

Key features

• 5m x 560mm black flexible flashing roll for in roof solar PV applications.
• Self adhesive backing for fast, secure bonding to the roof substrate.
• Lead free, UV and ozone resistant material for long term performance.
• Flexible and easy to trim, conforming to roof contours, ridges, and valleys.
• Compatible with widely used in‑roof systems, including SolFiT and GSE style layouts.
• Minimal waste design that reduces the need for multiple metal flashing and overlaps.

Technical specifications

Installation tips (for professionals)

• Ensure the roof substrate is clean, dry, and free from loose debris before application.
• Unroll the Fast Flash along the roof line, trimming with a sharp knife where needed to fit around penetrations and up stands.
• Smooth by hand or with a soft roller to remove air pockets and ensure full bond with the adhesive side.
• For painted finishes or where water may run from copper or bitumen onto the strip, apply a 100% acrylic, low sheen exterior paint over the exposed surface.
• Follow the manufacturer’s guidance and your in‑roof PV system’s technical manual for jointing, lapping, and edge detailing.

Deko Fast Flash 5m x 560mm delivers a fast, professional grade flashing solution that combines durability, ease of use, and strong visual integration with in‑roof solar PV installations. Add it to your racking kit to streamline your workflow and deliver a clean, watertight finish every time.