Fixing and buying guide

What this product is and who needs it

This combi tile flashing is a weatherproofing component for pitched tile roofs. It sits between roof tiles and the underlying structure (gill or underlay) to prevent water ingress at the tile-to-roof interface. Roofers, builders, and experienced DIY installers use this flashing on new tile roof installations or repairs where standard tile-only sealing is insufficient. The 120mm width suits typical tile roof applications.

Compatibility and timber grades

This flashing is compatible with F16 and F24 timber grades, which are common structural timber classifications for roof work in the UK. Check your roof structure specification or building plans to confirm your timber grade before ordering. The polypropylene and polyester construction is durable and resistant to weather exposure, making it suitable for long-term outdoor use.

• Suitable for F16 and F24 timber grades only
• For use on roofs with gill or underlay systems
• Weather-resistant polypropylene and polyester material

Sizing and cutting to fit

The flashing is supplied at 120mm width, which accommodates standard tile roof installations. On site, you can cut the flashing to length using a saw or mitre box to fit your specific roof dimensions and adapt to tight spaces or irregular tile layouts. Measure your roof run carefully before cutting to avoid waste.

• 120mm width for standard tile applications
• Cut to length on site with a saw or mitre box
• Measure roof dimensions before cutting

Pre-installation checks

Before fitting, confirm that your roof structure uses a gill or underlay system, as this flashing is designed specifically for those applications. Verify your timber grades match F16 or F24. Ensure the roof surface is clean and free from debris, and check that you have appropriate cutting tools (saw or mitre box) available on site. Have the correct number of flashings ready to avoid multiple trips to the merchant.