Product Overview
The PHS Astra Internal Vapour Control Membrane is an economical and high-performance solution designed to create an airtight building envelope while preventing condensation and drafts. With a fixed vapour resistance level of Sd 10m, it offers optimal vapour control in roof, wall, ceiling, and floor constructions, making it suitable for a wide range of internal applications across all construction types, including block, ICF, steel frame, and timber frame buildings.
By preventing the diffusion of internal moisture into the building envelope, the PHS Astra membrane reduces the risk of mildew growth and structural damage, improving indoor air quality and building longevity. Its CE certification in accordance with DIN 13984 ensures high-quality, reliable performance.
Key Features & Benefits
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Lightweight, Flexible, and Moisture-Resistant – Easy to handle and install.
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Enhances Airtightness & Thermal Performance – Reduces heat loss and improves building energy efficiency.
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Fixed Sd Value of 10m – Provides consistent water vapour resistance and optimal moisture control.
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Reduces Drafts and Heat Loss – Helps maintain a comfortable indoor environment.
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Versatile Applications – Suitable for ceilings, walls, floors, and loft spaces.
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CE Certified – Meets DIN 13984 standards for quality assurance.
Applications
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Internal installation to create an airtight envelope
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Ceilings, walls, floors, and loft spaces
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Compatible with all types of construction, including block, ICF, steel frame, and timber frame buildings
Technical Specifications
| Property |
Specification |
| Colour |
Green graphics on white |
| Location |
Internal |
| Mass Per Unit Area |
85 g/m² |
| Resistance to Fire |
Class E |
| Material |
Airtight Membrane |
| Roll Weight |
6.375 kg |
| Roll Area |
75 m² |
| System |
Airtight |
| Elongation Longitudinal |
91% |
| Elongation Transverse |
102% |
| Tear Resistance Longitudinal |
126 N |
| Tear Resistance Transverse |
144 N |
| Tensile Strength Longitudinal |
≥129 N/50mm |
| Tensile Strength Transverse |
≥100 N/50mm |
| Water Vapour Resistance – Sd Value |
10 m (Fixed) |
| Water Penetration Resistance |
Class W1 |
| Approx Coverage |
67 m² |
| Thickness |
0.4 mm |
| μ-Value |
2500 |
| Airtightness |
<0.01 m³/(m²·h·50Pa) |
| Application Area |
Ceiling, floors, internal wall, loft space |
| Size |
1.5 m × 50 m |
Installation Guide
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Store in dry rooms between +5°C to +25°C, protected from UV radiation.
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Apply the membrane perpendicular to the studs, rafters, or joists.
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Fix with staples every 150mm or use PHS Duplex double-sided tape.
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Seal barrier overlaps, penetrations, and perforations with PHS Argo Plus (Multi-Tape).
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For connections to concrete, block, or masonry, use PHS Ottello internal adhesive sealant.
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Ensure a 100mm overlap of membranes and tape, and seal all joints completely.
Why Choose PHS Astra
The PHS Astra Internal Vapour Control Membrane provides a cost-effective and reliable solution for creating airtight, energy-efficient building envelopes. Its fixed Sd 10m water vapour resistance ensures optimal indoor climate control while protecting structures from moisture damage, condensation, and drafts — making it an essential component for high-quality, sustainable construction projects.
