Fixing and buying guide

What this product is and who it is for

This is a combination flashing system that creates a weather-tight seal around roof and wall openings. It is designed for builders, roofers, and experienced DIY installers working on pitched roofs or vertical walls where openings need protection from the elements. The product is particularly useful when installing roof windows, vents, or other penetrations through tiled or slated roofing.

Compatibility and sizing

The flashing measures 134cm wide by 140cm high and is suitable for openings up to 140cm wide. It is compatible with timber grades F16, F24, and F36, which covers most standard structural timber used in UK construction. The UV-stabilised plastic construction means it works reliably with roof tiles, slates, and other conventional roofing materials.

• Maximum opening width: 140cm
• Compatible timber grades: F16, F24, F36
• Works with tiles, slates, and similar roofing materials
• Suitable for pitched roofs and vertical walls

Pre-installation checks

Before fitting, confirm that your opening width does not exceed 140cm and that your structural timber is one of the compatible grades. Check that the surrounding roof or wall structure is sound and that you have adequate access for installation. Ensure roofing materials are ready and that weather conditions allow safe working at height.

• Verify opening dimensions are within 140cm width limit
• Confirm timber grade is F16, F24, or F36
• Inspect surrounding structure for damage or rot
• Plan installation sequence with roofing materials

Installation and fixing

Installation is straightforward on pitched roofs and vertical walls. The flashing should be positioned to create a weather-tight seal, with careful attention to overlapping with existing roofing materials to direct water away from the opening. Follow the manufacturer's installation instructions to ensure proper sealing and secure fixing to the timber frame.