Fixing and buying guide

What this product is and who it is for

This is a twin and combination flashing system designed to seal the gap between your roof and an SK06 roof window or similar penetration. It prevents water ingress at the critical junction where the window meets the roof surface. The product is suitable for both domestic homeowners and commercial contractors installing or maintaining roof windows, vents or chimneys on pitched roofs. The straightforward design makes it accessible for experienced DIY installers, though professional fitting is recommended for optimal results.

Compatibility and sizing

This flashing is specifically designed for VELUX SK06 windows and compatible roof penetrations. The flashing measures 114 x 118 centimetres and is suitable for pitched roofs with a maximum slope of 45 degrees. Before purchasing, confirm that your roof window or penetration is an SK06 size and that your roof pitch does not exceed 45 degrees. Check the existing flashing condition if replacing an old unit, as the new flashing dimensions must align with your roof opening.

• Size: 114 x 118cm
• Designed for SK06 windows
• Maximum roof pitch: 45 degrees
• Suitable for skylights, vents, chimneys and roof penetrations

Material and durability

The flashing is manufactured from high-density polyethylene (HDPE), a durable plastic material that resists weathering, UV exposure and temperature fluctuations. HDPE provides excellent flexibility and impact resistance, making it suitable for the movement and stresses that occur on pitched roofs. The material requires minimal maintenance once installed and will provide reliable protection for many years when properly fitted and sealed.

Pre-installation checks and preparation

Before fitting, inspect your roof opening and existing flashing (if present) for damage or deterioration. Ensure the roof pitch is measured and confirmed to be 45 degrees or less. Check that the opening dimensions match the SK06 specification and that the surrounding roof structure is sound and free from rot or structural damage. Have all necessary sealants and fasteners ready before beginning installation. If replacing an existing flashing, remove the old unit carefully and clean the roof surface thoroughly to ensure proper adhesion of the new flashing.

• Confirm roof pitch does not exceed 45 degrees
• Verify SK06 window size and opening dimensions
• Inspect roof structure for damage or rot
• Clean roof surface before installation
• Gather sealants and fasteners in advance