Fixing and buying guide

What this product is and who it is for

This is a 2in1 tile flashing system that combines a weather-tight flashing layer with integrated insulation. It is designed for builders, roofers, and experienced DIY installers fitting VELUX roof windows into pitched tile roofs. The product eliminates the need to source and fit separate flashing and insulation components, making it ideal for anyone looking to streamline the installation process and reduce the risk of thermal loss around the window frame.

Compatibility and sizing

This flashing is engineered specifically for VELUX roof windows and is sized for openings measuring 151 x 118cm. Before ordering, confirm that your roof window opening matches these dimensions and that you are installing a compatible VELUX model. Check your window documentation or contact VELUX directly if you are unsure of the correct size for your installation.

• Opening size: 151 x 118cm
• Roof type: Pitched tile roofs only
• Compatible with VELUX roof windows
• Verify window model and opening dimensions before purchase

What is included and pre-installation checks

This is a single integrated flashing and insulation unit. Before installation, inspect the product for any damage in transit and ensure your roof structure is sound and ready to receive the window. Check that the roof opening has been cut to the correct size and that the surrounding tiles and roof structure are in good condition. Have all necessary tools and fixings to hand, and ensure you have a clear understanding of the VELUX installation instructions specific to this model.

• Single 2in1 flashing and insulation unit
• Inspect for transport damage before fitting
• Confirm roof opening is cut to 151 x 118cm
• Check roof structure and surrounding tiles are sound
• Have VELUX installation instructions available

Installation benefits

The 2in1 design reduces installation complexity by combining weatherproofing and insulation in one component. This minimises the number of separate items to fit, helping to speed up the installation process and reduce the potential for gaps or misalignment between flashing and insulation layers. The integrated system maintains roof integrity whilst helping to prevent thermal bridging around the window frame.

• Combines flashing and insulation in one unit
• Reduces installation time and component count
• Maintains weatherproofing on pitched tile roofs
• Minimises thermal bridging around the window opening