Sika Plan/ Sika – Trocal roof waterproofing membranes are suitable for use with virtually all commonly used subtracts – Including both new and refurbishment applications. They can be part of either warm or cold deck roofs – including both new and refurbishments applications & including mechanically fixed exposed, adhered exposed and ballasted types. The waterproof surfaces may be flat, sloped, vertical, curved – convex or concave, waveform, domed, etc. Fully British Board of Agreement (BBA) Certified the Sika Plan membranes are currently stated to have a minimum life .expectancy, in their opinion, of in excess of 30 years