Vapour Barrier – Green – Moisture Blocking for Residential & Commercial Use

Product Overview

The Green Vapour Barrier sheeting, measuring 4m in width and 50m in length, is a polyethylene membrane designed to prevent the passage of water vapour into colder areas of building fabric. Its 125mu (500-gauge) thickness provides high vapour resistance, protecting insulation, structural layers, and internal finishes. The membrane acts as a complete vapour and air barrier, positioned on the warm side of insulation to stop moisture-laden indoor air from reaching cold surfaces where condensation could occur. By preventing interstitial condensation, it protects against mould growth, damp staining, and deterioration of insulation materials, supporting long-term structural integrity. Its durable polymer construction ensures stable performance across wall, floor, and ceiling applications in both residential and commercial environments.

Features & Benefits

• Moisture restriction: Blocks the movement of warm, moisture-laden air to reduce the risk of condensation within the building fabric.
• Condensation prevention: Helps protect insulation layers from dampness, maintaining long-term thermal performance and material stability.
• Enhanced energy efficiency: Supports consistent internal temperatures by preserving insulation effectiveness throughout seasonal changes.
• Durable polyethylene construction: Provides reliable resistance against tearing, puncturing, and degradation during installation.
• Air barrier performance: Creates a continuous airtight layer when installed with sealed joints to support overall building airtightness.
• High vapour resistance: Delivers a vapour resistance of 266 MNs/g for robust moisture control in demanding environments.

Applications

• Internal wall assemblies: Installed on the warm side of insulation to prevent vapour ingress into colder structural layers.
• Ceiling and roof build-ups: Provides moisture control beneath insulated roof structures to limit condensation risk.
• Floor systems: Acts as a vapour barrier above ground floors where internal humidity requires controlled containment.

Installation Guidance

• Warm-side placement: Position the membrane on the interior side of insulation to maintain correct vapour control performance.
• Substrate preparation: Ensure framing, insulation surfaces, and junctions are clean and suitable for achieving continuous coverage.
• Fixing application: Secure the membrane using appropriate methods to ensure a tight fit.

• Material: Polyethylene
• Vapour Resistance: 266 MNs/g

Frequently Asked Questions

• Q: Can this barrier be used in both residential and commercial buildings?
  A: Yes, it is suitable for both environments due to its durable polymer construction.
• Q: How does this barrier enhance energy efficiency?
  A: It maintains insulation effectiveness, supporting consistent internal temperatures and reducing heat-loss pathways.