Novia Black+ FC125 is a premium, 125gsm high-performance breather membrane specifically engineered as a floor cassette membrane for use in timber frame wall applications. Designed with a sophisticated 3-layer membrane with a microporous core, it offers a specialised solution for protecting structures during the build phase and ensuring long-term thermal efficiency.
Novia Black+ FC125 delivers superior Class W1 water resistance and airtightness without compromising breathability. Engineered to minimise interstitial condensation at wall panel junctions, this high-performance membrane wraps floor cassettes to provide a seamless, airtight connection to the internal AVCL.
As a strong and durable breathable membrane, the FC125 is completely black on one side with no printed logos (except for a 150mm overlap line).
Key Features
- Advanced 3-Layer Construction: The FC125 is a 3-layer membrane featuring a high-tech microporous core that provides excellent Class W1 water resistance while maintaining high breathability.
- Optimised for Floor Cassettes: Specifically designed as a floor cassette membrane, it helps maintain airtightness at floor junctions a critical area for reducing heat loss.
- Superior Protection: Rated as a Class W1 breather membrane, it ensures the building remains waterproof against driving rain while remaining vapour permeable to allow interstitial moisture to escape.
- Airtight yet Breathable: The material is engineered for high water resistance and is airtight, yet it functions with high breathability to prevent condensation buildup within the insulation.
Installation -
To ensure a fully compliant, airtight seal, Novia provides a dedicated range of installation tapes for joining the cassette membrane to the vapour control layers (AVCL) above and below the floor junction. For a secure connection between Novia Black+ FC125 and the internal AVCL, use Novia Double Sided Butyl Tape. To seal the membrane overlaps, manyfacturer recommends Novia Breather Membrane Lap Tape (BMLT) to maintain the system's high-performance integrity.
- Roll Dimensions: 1m x 50m. One breather roll covers 50sqm.
- Novia FC125 is a high quality, strong and versatile floor cassette membrane, ideally used for timber frame wall applications.
- It is a 3-layer membrane with a microporous core.
- It has excellent Class W1 water resistance and is airtight, yet remaining vapour permeable with high breathability.
- This breather membrane is completely black on one side, grey on the reverse, with no text or images, except for a 150mm overlap line.
| Product Type | Breathable Membrane |
| Product Code | Black+ FC125 |
| Brand | Novia |
| Length | 50M |
| Width | 1M |
| Coverage | 50 Sqm |
| Roll Weight | 6.5 kg |
| Reaction to fire | Class E |
| Sd Value | 0.029m |
| Water Vapour Resistance | W1 |
| Order Value (Ex. VAT) | Delivery Charges (Ex. VAT) | ||
|---|---|---|---|
| Up to £115 |
£27 |
||
| £115.01 - £236 | £35 | ||
| £236.01 - £593 | £44 | ||
| £593.01 - £1185 | £55 | ||
| Above £1185 | Free | ||
Returns And Refunds
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You may cancel your order at any time before it is dispatched or before we provide an estimated delivery date via email.
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Once the order is confirmed and dispatched, it becomes non-returnable. Products are shipped directly from the manufacturer, and we do not accept returns.
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Please inspect the product upon delivery and report any damage to the driver immediately. If the product arrives damaged, contact us immediately
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If the delivery is rejected or the product is no longer required, it must be returned to the manufacturer. In such cases, a return or redelivery fee will apply and be deducted from your refund.
- For more information, please refer to our Return Policy

