Fixing and buying guide

What this product is and who it is for

Twin and combination flashings are metal or timber-based components that sit between your VELUX rooflight frame and the roof covering. They create a watertight barrier that prevents rain and moisture from penetrating around the rooflight opening. This product is suitable for both professional roofers and experienced DIY installers working on pitched roof installations. Grade A timber construction makes these flashings robust enough for demanding roofing environments.

Compatibility and sizing

These flashings are specifically designed for VELUX rooflights and measure 134x98cm, which matches most standard VELUX rooflight dimensions. Before ordering, confirm your rooflight model and opening size against VELUX documentation to ensure correct fit. The flashings are engineered for pitched roofs with varying angles and pitches, making them adaptable to most residential roof configurations. Check your roof pitch and rooflight frame dimensions before purchase to avoid compatibility issues.

Material and finish specification

The flashings are constructed from Grade A timber, which provides structural integrity and longevity. The EBP (Exterior Brushed Paint) finish offers weathering resistance and durability, protecting the timber from UV exposure and moisture damage. This finish is designed to withstand UK weather conditions and requires minimal maintenance once installed. The timber construction allows for straightforward fixing to both the rooflight frame and roof structure.

• Grade A timber ensures strength and reliability
• EBP finish provides weather protection and durability
• Suitable for exposed pitched roof installations
• Timber construction allows standard fixing methods

Pre-installation checks and preparation

Before fixing these flashings, inspect your rooflight opening and surrounding roof structure for any damage or deterioration. Ensure the rooflight frame is square and level, and that the opening dimensions match the 134x98cm specification. Check that your roof covering material is compatible with the flashing installation method. Have all necessary fixings and sealants to hand before beginning work. Clear the roof area of debris and ensure safe working conditions, particularly on pitched roofs.

• Verify rooflight model and opening dimensions match product specification
• Inspect rooflight frame for damage or misalignment
• Confirm roof pitch and covering material compatibility
• Gather all fixings and weatherproofing sealants before starting
• Ensure safe access and working conditions on the pitched roof