Kingspan Nilvent Breather Membrane - 50m x 1.5m

• Waterproof - can be used as a temporary roof covering
• Non-tenting and lightweight
• Airtight at normal building pressures
• Excellent water vapour permeability
• Strong - excellent nail tear and tensile strengths

Kingspan Nilvent Breather Felt is best suited for use as a breathable membrane in unventilated pitched roof and timber frame wall applications. It provides excellent water resistance while allowing the safe passage of water vapour, helping to prevent condensation within the building envelope. Nilvent is airtight under normal building pressures and features high tensile strength and durability, making it ideal for use in demanding construction environments. Its performance supports the longevity and energy efficiency of the structure by protecting insulation materials from moisture ingress while enabling the building to breathe. It is not a vapour control layer, but rather a breather membrane designed for external use.

What is Kingspan Nilvent?

Nilvent is a breathable membrane engineered for unventilated pitched roofs and timber‑frame walls, combining waterproofing, airtightness, and excellent vapour permeability. It consists of a laminated three-layer polyolefin construction.

 What is it used for?

It's ideal for replacing traditional sarking felt, eliminating the need for roof ventilation above insulation. Its low vapour resistance prevents condensation by allowing moisture vapour to escape to the outside.

What are the benefits of using Nilvent?

• Fully waterproof, can be used as a temporary roof covering during construction.
• Airtight under standard building pressure, supports energy-efficient builds
• UV- and tear-resistant, with quiet wind performance and long-term durability.
• Self-seals around nail penetrations, reducing the need for extra sealing.