Fixing and buying guide

What this product is and who it is for

This is a twin and combination flashing for VELUX rooflights. It is for builders, roofers, and serious DIY installers fitting or replacing UK08 size VELUX rooflights who need to ensure a secure, watertight seal around the rooflight opening. The flashing prevents water ingress and is essential for any rooflight installation on residential or commercial properties.

Compatibility and sizing

This flashing is specifically designed for VELUX UK08 rooflights and measures 134 x 140cm (52 x 55 inches). It is compatible with timber grades F16, F24, and F36, which covers standard structural timber used in UK roof construction. Before ordering, confirm your rooflight size is UK08 and check that your roof structure uses one of these timber grades.

• Rooflight size: UK08 only
• Flashing dimensions: 134 x 140cm
• Compatible timber grades: F16, F24, F36
• Suitable for flat roofs, pitched roofs, and roof terraces

What is included and material

You receive one twin and combination flashing unit manufactured from durable plastic. This plastic construction is engineered to resist corrosion and weather wear, ensuring long-term performance in UK climate conditions including exposure to rain, snow, and temperature fluctuations.

Pre-installation checks

Before fitting, verify that your VELUX rooflight is size UK08 and that your roof structure uses F16, F24, or F36 timber. Inspect the rooflight opening to ensure it is clean and free from debris. Check that the flashing is undamaged and that all edges are intact. Ensure you have the correct installation tools and fixings for your roof type, and follow VELUX installation instructions for your specific roof application.