Fixing and buying guide
VELUX Vapour Barrier 134x98cm BBX UK04 0000
Who this product is for
This vapour barrier is intended for builders, contractors, and serious DIY enthusiasts undertaking new build construction or existing building retrofit projects. It is essential for anyone installing insulation systems in cavity walls or structural applications where moisture control and condensation prevention are required to meet current building standards and site practice.
- New build cavity wall construction
- Existing building retrofit and renovation projects
- Structural applications requiring moisture control
- Projects where condensation prevention is a priority
Sizing and coverage
The vapour barrier measures 134 x 98cm per sheet, providing coverage suitable for standard cavity wall and structural applications. Each sheet covers approximately 1.31 square metres. Calculate your total wall area and order sufficient sheets to cover the full application area, allowing for overlap at seams and edges as recommended by current site practice and manufacturer guidance.
- Single sheet dimensions: 134 x 98cm
- Coverage per sheet: approximately 1.31m²
- Material thickness: 0.1mm polyethylene film
- Plan for seam overlap and edge coverage when ordering
Installation and compatibility
Install the vapour barrier in accordance with current building standards and manufacturer guidance. The polyethylene film should be positioned to create a continuous moisture barrier across cavity walls and structural elements. Ensure proper overlap at all seams and edges to maintain the integrity of the barrier. The product is compatible with standard cavity wall construction and insulation systems used in both new build and retrofit applications.
- Position as a continuous moisture barrier in cavity walls
- Overlap seams and edges according to manufacturer guidance
- Install in accordance with current building standards and site practice
- Suitable for use with standard insulation systems
- Compatible with both new build and existing building construction
Pre-installation checks
Before installation, confirm that the vapour barrier is appropriate for your specific building application and that you have sufficient coverage for the full area. Check that the polyethylene film is undamaged and that you have access to current manufacturer guidance and relevant building standards for your project. Ensure the substrate is clean and dry, and that you have the correct tools and materials for sealing seams and edges as recommended.
- Verify product suitability for your specific application
- Calculate total coverage required and order accordingly
- Inspect the polyethylene film for damage before installation
- Confirm substrate is clean and dry
- Have sealing materials ready for seams and edges