How and where to use guide
VELUX EDL CK04 2000 Pro+ Standard Flashings W/ Installation Products 55x98cm
Typical applications and suitability
This flashing system is designed specifically for slate roof applications where a VELUX roof window or Sun Tunnel system is being installed. The CK04 2000 size (550×980mm) suits standard roof window openings. Use this product in both new build projects where the roof structure is being constructed, and in refurbishment work where you are retrofitting daylight or ventilation solutions into existing slate-covered roofs. The flashing ensures the window or Sun Tunnel integrates neatly with the slate covering without compromising the weather resistance of the roof.
- New build roof window installations in slate-covered roofs
- Refurbishment projects adding daylight or ventilation to existing properties
- Compatible with standard VELUX roof window and Sun Tunnel ranges
- Maintains visual consistency with slate roof coverings
Installation and on-site assembly
The kit includes BDX 2000 installation products to support professional assembly on site. Before installation, ensure the roof opening is correctly sized and prepared to receive the CK04 2000 flashing (550×980mm). Position the flashing around the roof window or Sun Tunnel frame, using the included installation products to secure and seal it in place. The flashing must be integrated with the slate roof covering so that slates above the window overlap the flashing, and slates below sit beneath it, creating a continuous weather-tight barrier. Follow the step-by-step instructions provided with the kit to ensure correct positioning and sealing. All joints and edges must be properly sealed to prevent water ingress.
- Check roof opening dimensions match CK04 2000 size (550×980mm) before starting
- Use all included installation products as specified in the kit instructions
- Integrate flashing with slate covering so water runs over and under the flashing correctly
- Seal all joints and edges thoroughly to maintain weather-tightness
- Allow adequate time for any sealants to cure before exposing the roof to weather
Limitations and maintenance
This flashing system is engineered specifically for slate roof applications and should not be used with other roof coverings such as tiles, felt, or metal sheeting. The 8mm glazing thickness is standard for VELUX roof windows; ensure your window or Sun Tunnel is compatible before ordering. Once installed, the flashing requires minimal maintenance, but you should inspect it periodically as part of routine roof maintenance to ensure sealants remain intact and no debris has accumulated around the frame. In areas of heavy moss or lichen growth, gentle cleaning may be needed to maintain the appearance and ensure water drainage is not obstructed.
- Suitable for slate roofs only; not for use with tile, felt, or metal roof coverings
- Confirm compatibility with your VELUX roof window or Sun Tunnel before installation
- Inspect periodically to ensure sealants remain intact and water drainage is clear
- Clean gently if moss or lichen accumulates to maintain appearance and drainage