Fixing and buying guide

What this product is and who it is for

This is a recessed flashing kit for flat roof installations. It is designed for builders, roofers, and serious DIY installers fitting VELUX roof windows into flat roof structures. The product suits both domestic properties and commercial buildings where weather protection and durability are essential. Grade A timber construction ensures the flashing will perform reliably in exposed conditions over many years.

Compatibility and sizing

These flashings are sized 55 × 118 cm and are specifically engineered to work with VELUX roof window systems. Before purchase, confirm that your VELUX window model is compatible with the CK06 recessed flashing type. Check your roof window documentation or contact VELUX technical support if you are unsure of compatibility. The dimensions given are the flashing footprint; ensure your flat roof opening matches the window size this flashing is designed for.

Material and finish

The flashing is manufactured from Grade A timber with a natural finish. This timber grade offers excellent durability and stability, essential for a component exposed to weather and temperature fluctuations. The natural finish allows the timber to weather naturally over time. If you intend to paint or stain the flashing, prepare the surface appropriately before installation and use products suitable for exterior timber.

• Grade A timber ensures strength and longevity
• Natural finish requires no treatment before installation
• Suitable for painting or staining if desired
• Durable in both domestic and commercial environments

Pre-installation checks and preparation

Before fitting, inspect the flashing for any damage or warping during delivery. Check that your flat roof opening is clean, level, and correctly sized for this flashing. Ensure the roof structure is sound and able to support the window and flashing assembly. Verify that all necessary VELUX components and fixings are included or sourced separately. Have the roof window installation instructions to hand, as the flashing must be fitted in sequence with the window frame and roof weatherproofing layers.

• Inspect timber for damage before installation
• Confirm roof opening dimensions match the flashing size
• Ensure roof structure is level and structurally sound
• Have VELUX window installation guide available
• Check that all fixings and sealants are to hand