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BMI launches air open, vapour permeable pitched roofing underlay
Suitable for warm and cold pitched roof systems, the triple-layer membrane allows water vapour to escape from within the roof structure while providing reliable protection against water ingress.
Thanks to its air-open, low-water vapour resistance structure, eliminates the need for additional tile, ridge or eaves ventilation, helping to address condensation risks in line with current BS 5250 guidelines, which is particularly important during the drying-out period of new homes especially during the first winter heating season.
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High Wind Exposure
High Wind Exposure
Divoroll Air is compatible for installation in all UK wind zones in accordance with current BS 5534 guidance. For projects in higher wind exposure areas (zones 4-5), underlay laps can be sealed using ClimaTape, a new multifunctional tape from Redland that creates airtight and secure seals between underlay laps. In zones 1-3, Divoroll Air can be installed with just a battened headlap, offering flexibility and ease of application across a wide range of designs.
Managing Ventilation for Complex Projects
Managing Ventilation for Complex Projects
Mat Woodyatt, Product Manager at BMI UK & Ireland, said: “Managing ventilation for complex roof designs is a challenge, but Divoroll Air makes this much simpler. Its low-water vapour resistance structure helps remove the need for extra ventilation products while supporting compliance with the current BS 5250 code of practice.
“What really sets Divoroll Air apart is the reassurance it offers when specified as part of a complete guaranteed Redland specified roof system. Under our SpecMaster 15-year system guarantee, we take responsibility if anything goes wrong within the first 15 years with the supplied materials or the design and you are covered for materials, labour and scaffolding in the event of a valid claim subject to the guarantee terms and conditions*. You won’t find a more comprehensive pitched roof guarantee anywhere else.”
BBA Certified & Meets NHBC Guidelines
BBA Certified & Meets NHBC Guidelines
Divoroll Air is BBA certified for cold and warm non-ventilated pitched roofs, and meets NHBC guidelines for underlays in pitched roofs.
To learn more about Redland pitched roofing products and services, visit our dedicated page through the link below.
*Contact BMI Redland Technical Services for full terms and conditions of the SpecMaster system guarantee at
