Fixing and buying guide

What this product is and who it is for

This is a twin and combination flashing made from robust vinyl. It is designed for anyone installing or replacing rooflights, skylights, windows or doors where a weather-tight seal is essential. The product suits both trade professionals and serious DIY customers who need reliable protection against water ingress on pitched roofs and wall openings.

Substrate compatibility and sizing

The flashing is compatible with timber frames, brickwork and concrete substrates. At 55 x 118cm, this size is suitable for standard rooflights and skylights, particularly VELUX units. Before ordering, measure your opening carefully and confirm that this size matches your installation requirements. If you are unsure of the correct size for your specific rooflight or window, check the manufacturer's documentation or consult the product specification.

• Suitable for timber, brick and concrete substrates
• Size: 55 x 118cm
• Designed for rooflights, skylights, windows and doors
• Compatible with VELUX rooflights and skylights

Pre-installation checks

Before fitting, inspect the flashing for any damage and ensure your opening is clean, dry and free from debris. Check that the substrate (timber, brick or concrete) is sound and level. Confirm that the flashing size matches your opening dimensions and that you have suitable fixings to hand. Review the manufacturer's installation guidance to ensure you understand the correct fitting method for your specific substrate type.

• Inspect flashing for damage before installation
• Ensure opening is clean, dry and level
• Verify substrate condition (timber, brick or concrete)
• Confirm size matches your opening
• Have appropriate fixings ready

Installation and fixings

Install the flashing using suitable fixings appropriate to your substrate type. Timber frames typically require screws or nails, whilst brick and concrete may require masonry fixings. Follow the manufacturer's guidance closely to ensure the flashing is positioned correctly and secured firmly to create a proper weather-tight seal. The vinyl construction is durable and will withstand harsh weather conditions once correctly installed.