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Onduline launches the only UK waterproofing system guaranteed 10º pitch

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Onduline, the lightweight roofing systems and waterproofing specialist, is delighted to announce the launch of its new and unique under-roof system, ISOLINE® LOW LINE—the only system in the UK to be BRE-tested and BBA-accredited to as low as 10º.

Designed specifically for use on low pitch roofs, this lightweight bituminous underlay sheeting has been rigorously tested and is proven to be at least three times less likely to leak compared to a traditional tile system.

With a corrugation height of just 24 mm, ISOLINE® LOW LINE is fixed below the primary tile or slate roof covering, acting as the primary waterproofing layer of a roof. Roof tiles become a secondary line of defence, enabling the pitch of the roof to be much lower than the minimum as recommended by the tile manufacturer.

Not only does this help to meet the demand for maximising living space, as the low pitch means the roof void can be minimised, it also enables traditional tiles to be used in situations where they would not have been able to be utilised previously, such as extensions or large roofing projects, greatly enhancing the aesthetic quality of a property.

For more information on the ISOLINE® LOW LINE roofing system, and Onduline’s other lightweight, eco-friendly and durable roofing solutions, please visit

Onduline ten degree pitch roof

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