Fixing and buying guide

What this product is and who needs it

These are purpose-designed flashings for timber-framed construction where windows and doors require secure, weather-tight sealing. They are essential for builders and serious DIY installers working on new builds or renovations involving timber-frame structures. The twin and combination design allows flexibility in how you configure the flashing around different opening types and roof details.

Sizing and compatibility

The 94 x 140cm dimensions suit standard window and door openings in timber-frame builds. These flashings are specifically engineered to work with other VELUX flashing products, so if you are building a complete flashing system around multiple openings or complex roof junctions, check that all components are VELUX-compatible. Confirm your opening dimensions match this size before ordering.

• Dimensions: 94 x 140cm
• Material: EBP (Expanded Polypropylene)
• Compatible with other VELUX flashing products
• Suitable for roof valleys, eaves, and standard openings

Material performance and durability

EBP material is chosen for its proven durability in harsh outdoor environments. It resists both corrosion and UV degradation, meaning these flashings will maintain their integrity and performance over many years of exposure to weather, sunlight, and temperature cycling. This makes them a reliable choice for exposed roof and wall positions where traditional metal flashings might corrode or where plastic alternatives might degrade.

Pre-installation checks

Before fitting, verify that your window or door opening dimensions align with the 94 x 140cm flashing size. Ensure the timber frame is sound, dry, and properly prepared. Check that you have all other VELUX flashing components needed for your complete installation, as these twin and combination flashings work as part of an integrated system. Inspect the flashing for any damage during delivery and confirm it is free from dirt or debris before installation.

• Confirm opening dimensions match the 94 x 140cm size
• Check timber frame is sound and dry
• Verify all VELUX system components are on site
• Inspect for delivery damage and clean before fitting