Novia Black+ FC125 Breather Membrane Floor Cassette Breather Membrane - 50m x 1m (50m²)

• 3-layer membrane with microporous core
  Provides strength and controlled vapour permeability for timber frame wall applications
  
• Class W1 water resistance
  Resists water penetration in accordance with EN 1928
  
• Airtight yet vapour permeable
  Maintains breathability while helping reduce interstitial condensation around floor junctions
  
• Good tensile and nail tear strength
  Tensile strength MD/CD: 285 / 165 N/50mm (EN 12311-1); Tear resistance MD/CD: 125 / 120 N (EN 12310-1)
  
• Class E fire classification
  Tested to EN 13501-1 / EN 11925-2 for reaction to fire
  
• Low temperature stability to -60°C
  Remains stable without cracking at very low temperatures (EN 1109)
  
• Roll size: 1m x 50m (50m², 6.5kg roll)
  Standardised dimensions for easy installation and handling
  
• Colour-coded for installation
  Black on one side, grey on reverse, with 150mm overlap line for correct placement
  
• Compatible with Novia® installation tapes
  Use Double Sided Butyl Tape and Breather Membrane Lap Tape (BMLT) to connect to internal AVCL and seal floor junctions
  
• UV resistance guidance
  Install in accordance with BS 5534 to maintain performance in exposed conditions

Walls & Floors

Novia® Black+ FC125 is used in timber frame wall and floor constructions to maintain airtightness and manage moisture vapour. Installed at floor junctions and around the floor cassette, it reduces the risk of interstitial condensation and links directly with internal AVCLs to provide a continuous, vapour-permeable, airtight barrier across the construction envelope. Its Class W1 water resistance and high breathability support energy efficiency and protect insulation performance.

Floor Junctions in Timber Frame Walls

Novia® Black+ FC125 is installed around the floor cassette to maintain airtightness at floor-to-wall connections. The membrane helps reduce the risk of interstitial condensation around panel junctions, ensuring the construction remains protected from moisture ingress.

Connection to Internal AVCL

The product is designed to link directly with internal Air & Vapour Control Layers (AVCLs) such as Novia® 500g, 1000g, 1200g VirginPoly, or Novia® VC200 Reflective. This connection provides a continuous, airtight, and vapour-permeable barrier across the construction envelope, maintaining the integrity of the internal insulation.

Airtightness and Breathability

Novia® Black+ FC125 provides a strong, vapour-permeable seal at floor junctions while remaining Class W1 water resistant. It maintains overall energy efficiency by preventing unwanted air leakage and protects insulation performance by limiting moisture accumulation within the floor construction.

Timber Frame Constructions

Ideal for timber frame buildings, Novia® Black+ FC125 can be mechanically fixed and sealed using Novia® tapes to form a robust and airtight junction. Its design ensures compatibility with typical timber frame construction methods and supports long-term structural and thermal performance.

Fire and Structural Compliance

Novia® Black+ FC125 meets Class E fire performance requirements and offers high tensile and nail tear strength, making it suitable for secure installation at critical floor junctions. The product contributes to compliance with structural and fire safety requirements in modern timber frame constructions.

What is Novia® Black+ FC125?

Novia® Black+ FC125 is a high-quality, 3-layer floor cassette membrane designed for use in timber frame wall applications. It provides an airtight yet vapour-permeable barrier around floor junctions, helping to reduce the risk of interstitial condensation and maintain overall building airtightness.

What are the main benefits of using Novia® Black+ FC125?

Novia® Black+ FC125 offers Class W1 water resistance, high breathability, and airtight performance. It improves building durability by managing moisture around floor junctions, reduces condensation risks, and maintains the thermal performance of insulation. Its strong tensile and nail tear resistance also ensures long-term reliability.

What types of construction is Novia® Black+ FC125 suitable for?

Novia® Black+ FC125 is suitable for timber frame wall constructions, particularly where floor cassette junctions need airtight and vapour-permeable detailing. It works in combination with an internal Novia AVCL and can be integrated with Novia tapes to achieve a fully sealed system.

How should Novia® Black+ FC125 be installed?

Install Novia® Black+ FC125 around the floor cassette on the warm side of the insulation. Connect it to the internal AVCL using Novia Double Sided Butyl Tape and seal overlaps with Novia Breather Membrane Lap Tape (BMLT). Handle the membrane carefully to avoid punctures, and repair any on-site damage with Novia tapes. Ensure adequate ventilation and compliance with building regulations.

What are the key technical properties of Novia® Black+ FC125?

Novia® Black+ FC125 features:

• Roll size: 1m x 50m (50m²)
• Tensile strength: 285 / 165 N/50mm (MD/CD)
• Elongation: 70 / 90 % (MD/CD)
• Tear resistance: 125 / 120 N (MD/CD)
• Water resistance: Class W1 to EN 1928
• Vapour permeability: Sd 0.029 m
• Fire rating: Class E to EN 13501-1
• Low temperature stability: -60°C
  

It is UKCA approved to EN 13859-1 & EN 13859-2 and must be installed with compatible Novia tapes for optimum performance.