Dear Sirs, As architects currently involved with an existing cantilevered concrete balcony which has been leaking rainwater through to a supporting beam within a public area below. We would like to remove the existing failed weatherproofing and use a Sika system built up from existing screed level once exposed right through to a walkable, useable and decorative finish.We would be much obliged if you could provide the appropriate specification as there appears to be a large range of different Sika products. Yours faithfully. J. Allan