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In accordance with BS5534 the laps of a roofing underlay can be restrained in 3 ways:
1. Restrained with an integrated or external tape.
2. Restrained with a ‘fly’ batten.
3. Restrained using the existing tile/slate batten line. The most cost-effective and quality-assured way of achieving this is by installing a roofing underlay with a double integrated tape system.