Over 30 years of waterproofing experience supported by an extensive product range that covers everything from high performance roofing systems, offering the latest in specification, support and guarantees, including specialist liquid solutions, bituminous mastics and a range of insulation and acoustic products. Index bitumen based built-up waterproofing systems are available with a choice of 10,15 or 20 year guarantees where they have been installed by an approved Index contractor and certified by an Index technical manager.