One Way (Heavy Duty and Maximum Grades)
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Available in 2 variation(s).
Aspirating roofing underlay for non-ventilated pitched roof systems. Protects against water ingress and permits ventilation of moisture.
On pitched roofs this product may be used instead of conventional underlay felt. It provides strength, stabilisation and resistance to water (6 metre water support). Use of this product as part of a roofing system permits the roof to breathe. One Way (heavy duty) provides an alternative to the use of conventional ventilation products and may be used to satisfy the appropriate Building Regulation requirements. (see ventilation manual).
One Way (maximum) is a heavier version in which the thermally bonded structure is thickened. This product provides the strongest possible protection and the highest possible resistance against tearing and ripping. (see ventilation manual)
• Size both versions 50m x 1.5m or 50m x 1m.
• Weight: 10.9kg. / 12.375kg.
• Three layer thermally bonded PP.
• Full specifications within Ventilation Manual.