Fixing and buying guide

What this product is and who needs it

This is a vapour barrier membrane for roofing applications. It sits within the roof assembly to block moisture transmission and prevent condensation and mould growth. It is suitable for builders, roofers, and serious DIY customers undertaking new roof builds or refurbishment work where moisture control is critical. The CK06 grade is specified for structural roofing applications where robust performance is essential.

Size and coverage

This barrier measures 55 × 118cm per sheet. Before ordering, confirm the total roof area you need to cover and calculate the number of sheets required, accounting for overlap at seams. Always check your project specification to ensure this size and grade match your design requirements.

• Single sheet size: 55 × 118cm
• Material: 0.5mm polyethylene
• Grade: CK06 for structural roofing
• Suitable for new builds and refurbishments

Pre-installation checks

Before fixing, inspect the membrane for any damage or defects. Ensure your roof structure is clean, dry, and free from sharp protrusions that could puncture the barrier. Confirm the installation location within the roof assembly matches your building design and current site practice. Check that all necessary fixings and sealing materials are available.

• Inspect the membrane for tears or punctures
• Prepare the roof structure surface
• Verify correct positioning within the roof assembly
• Have fixings and sealing tape ready

Installation and fixing

Install the vapour barrier in line with current best practice and your project specification. The membrane should be laid continuously across the roof assembly to maintain unbroken protection. Overlap seams appropriately and seal them to prevent vapour transmission. Secure the barrier using approved fixings suitable for roofing applications. Ensure no gaps or punctures compromise the continuous protection.