Description
Fosroc Proofex Total – High Performance Gas & Damp Protection Membrane
Proofex Total is a multi-layer reinforced polyethylene membrane with aluminium foil core, designed to deliver advanced protection against ground gases, moisture, and hydrocarbons in modern construction.
Manufactured by Fosroc, it combines gas resistance, durability, and ease of installation for both above and below slab applications.
Key Features & Benefits
- Multi-Layer Protection – Maximum resistance to methane, radon & CO₂
- Reinforced Design – Polyester grid improves puncture resistance
- Dual Function – Gas barrier + damp proof membrane (DPM)
- Flexible Installation – Loose-laid system with taped or welded joints
- Hydrocarbon Resistance – Protects against vapours (non-direct contact)
- Versatile Use – Suitable for concrete slabs, precast floors & masonry walls
✔ Eliminates need for separate DPC in some wall constructions
Product Overview
- Material: LDPE multi-layer membrane with aluminium foil & PP reinforcement
- Colour: Black (top) / White (reverse)
- Roll Size: 2m x 50m
- Thickness: 0.6mm
- Weight: 370 g/m²
Performance Highlights
- Methane Permeability: < 0.09 ml/m²/day/atm
- Carbon Dioxide Permeability: < 0.09 ml/m²/day/atm
- Radon Resistance: 8.0 × 10⁻¹⁵ m²/s
- Water Resistance: >300m water column
- Puncture Resistance: 1.25 kN
- Tensile Strength: Up to 600 N/50mm
✔ High durability against tearing, impact, and chemical exposure
Standards & Compliance
- BBA Certified (No. 21/5880)
- BS 8485:2015 + A1:2019 compliant
- BRE 211 & BRE 212 guidance compliant
- CIRIA C665 (CS2–CS6 gas regimes)
- NHBC Amber 1 & 2 compliant
✔ Suitable for regulated gas protection systems
Applications
- Ground gas protection (methane, radon, CO₂)
- Damp proof membrane (DPM)
- Hydrocarbon vapour protection
- Under slab and over slab installations
- Beam & block or precast floor systems
- Masonry wall construction
Installation Overview
Substrate Preparation
- Smooth, level surface (sand blinding, insulation, or concrete)
- Free from sharp objects or voids
Laying
- Install with black side facing upwards
- Lay flat with no creases
- Allow folds in areas of potential movement
Jointing Options
- Tape method: 100mm lap using Proofex Total Tape
- Welded method: 180–240°C, 50mm weld seam
✔ All joints must be continuous with no gaps
Detailing & Protection
- Seal penetrations using:
- Top Hat units
- Flashing strips or liquid detailing
- Protect membrane using:
- Insulation boards
- Geotextile (≥300gsm)
- Protection boards
✔ Prevent damage before further construction
Inspection & Repairs
- Inspect before covering
- Repair damage with:
- Membrane patches (min 150mm overlap)
- Tape or welded joints
✔ Must be validated for compliance with BS8485 systems
Ancillary Products
- Proofex Total Tape (joint sealing)
- Proofex Top Hats (pipe penetrations)
- Proofex Flashing Strip (detailing & repairs)
Storage & Handling
- Store in original packaging
- Keep dry, cool, and out of sunlight
- Follow manual handling best practices
Why Choose Proofex Total?
- High-performance gas & moisture protection
- Certified for UK building standards
- Durable, reinforced design for site conditions
- Flexible installation methods
✔ Ideal for projects requiring compliant gas protection systems
Frequently Asked Questions
What gases does it protect against?
Methane, carbon dioxide, radon, and hydrocarbon vapours (non-direct contact).
Can it be used as a DPM?
Yes, it acts as a combined gas barrier and damp proof membrane.
How are joints sealed?
Either with Proofex tape or heat welding.
Can it be used in walls?
Yes, it can be integrated into masonry wall construction.
Does it require validation?
Yes, for gas protection systems under BS8485, independent validation is required.
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