Fixing and buying guide

Who this product is for

This flashing system is for builders, roofers, and experienced DIY installers planning to fit two VELUX roof windows or a combination of VELUX window types on the same pitched roof. It is particularly suited to projects where dual windows are positioned close enough to benefit from a combined flashing approach, simplifying the installation process compared to fitting separate flashings for each opening.

Compatibility and sizing

These flashings are designed for use with compatible VELUX roof window ranges and are sized at 134x98cm to suit standard UK pitched roof applications. Before ordering, confirm that your roof pitch falls within the standard range and that your chosen VELUX windows are compatible with this twin and combination flashing system. Check the positioning and spacing of your two window openings to ensure they can be accommodated within the 134x98cm footprint.

• Dimensions: 134x98cm
• Material: Aluminium and synthetic components
• Application: Pitched roofs only
• Verify VELUX window model compatibility before purchase

What is included and pre-installation checks

This is a complete dual-window flashing unit with integrated weatherproofing. Before installation, inspect the flashing for any damage in transit, ensure your roof structure is sound and ready to receive the windows, and confirm that the roof pitch and window opening dimensions match the specifications for this 134x98cm system. Check that all necessary roof window components and fixings are to hand, and review the VELUX installation instructions specific to this flashing model.

• Inspect flashing for transport damage
• Verify roof pitch compatibility
• Confirm window opening dimensions and spacing
• Have all VELUX window components and fixings ready
• Review manufacturer installation guidance

Installation and weatherproofing

The integrated weatherproofing design of this flashing system prevents water ingress around both window perimeters when installed correctly. Proper sealing and fixing around the flashing edges is essential to maintain the weatherproofing integrity. Follow VELUX installation instructions carefully, ensuring the flashing is securely fixed to the roof structure and that all joints and edges are sealed appropriately. This engineered system is designed for secure, long-term performance when installed by competent installers.