I have a fibre cement tiled pitched roof with a parapet wall at the bottom. In order to form a sealed gulley for the rainwater, I intend to use 1mm butyl rubber sheet (pond liner) cover the parapet wall, the gulley and tucked up under a couple of courses of tiles. The decking under the tiles is Sterling Board (OSB) and the parapet wall is made of concrete blocks.
What would be a suitable adhesive to use to stick the rubber to both damp concrete and the OSB. I dont want to use a contact type as I will be upon the roof man handling a 10m long strip of rubber and it is bound to get stuck to itself somewhere along the line. Once the rubber is in place I will be covering the edge along the parapet wall so ultimate water proofing from the adhesive is not essential.
There are a number of bituminous lap-cement type roofing adhesives but I don't know if these are compatible with butyl rubber.
Any suggestions wold be welcome - apart from 'don't do it like that' as I'm already committed to the method.
TIA
Bob