The BMI Redland underlay system provides a heavy-duty wind-tight system for your roof. Our Spirtech and Divoroll vapour-permeable underlays integrate smart features, such as integral glue-strips, superior tear-resistance and a reinforced grid, so that installation is quick and easy.
Independently tested by the BRE, all our underlays exceed BS 5534 requirements and are suitable for all wind zones throughout the country.
Fully compliant with BS 5534 and BBA Certified
Suitable for all wind zones throughout the country (1-5)
Strong and durable with reinforced grid
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