Kingspan Nilvent - Breathable Membrane for Unventilated Pitched Roofs

Kingspan Nilvent will give a completely watertight structure under normal weather conditions. Kingspan Nilvent is highly water resistant, and has the added advantage of selfsealing around nail penetrations. These properties mean that it can be safely used even in constructions with a large number of nail penetrations through the membrane e.g. where natural slates are nailed directly into a sarking board.

Most buildings contain air that is more humid than the air outside of that building. This humidity differential drives the moisture from the inside to the outside of a buildings structure. When the moisture is confronted with a relatively cold and impermeable layer it may condense. In pitched roofs, sarking felt can be such a layer. The traditional way of avoiding the risk of condensation in roofs is to ventilate the moisture away by introducing airflow directly above the insulation layer and below the sarking felt. Modern remedies for roofs include the use of breathable membranes to replace sarking felt.

Kingspan Nilvent breathable membrane negate the need for ventilation directly above the insulation layer. It does this because it has a low vapour resistance, which allows water vapour to escape through the breathable membrane to the outside of the building. Recent studies have shown that ventilation directly above an insulation layer can reduce its thermal efficiency. BS 5250: 2002 (Code of practice for control of condensation in buildings) states that the vapour resistance of the breathable sarking membrane must not exceed 0.25 MN.s/g. Kingspan Nilvent has a vapour resistance of 0.17 MN.s/g. Any water vapour reaching Kingspan nilvent escapes through it without condensing.

Kingspan Nilvent comprises a laminated, 3layer polyolefin construction. The top layer provides protection from UV and mechanical damage. The middle layer is the functional layer. The bottom layer provides abrasion resistance.

• Next generation breathable membrane technology,
• Completely waterproof can be used as a temporary waterproof roof covering,
• Nontenting,
• Completely airtight,
• Excellent water vapour permeability no condensation risk,
• Strong excellent nail tear and tensile strengths,
• Quiet under wind loading,
• Durable heat and UV stable,
• Lifetime guarantee,
• Selfsealing around nail penetrations,
• Lightweight,
• Easy to handle and install,
• Ideal for newbuild,
• Environmentally friendly CFC/HCFCfree with zero Ozone Depletion Potential (ODP)

• Manufactured to the highest standards under a quality control system approved to EN ISO 9001:1994 (Quality systems. Model for quality assurance in production, installation and servicing).
• BBA Certificate 04/4161.
  

Kingspan Nilvent Product Data Sheet