green chipboards guys, 3 sq m etre on a bathroom floor,,pretty solid too and screwed. customer wants it tiled direct to no height isues,i have bought bal fastflex sp addy and also gt1 admix for my grout i was advised this was suitable,,have any tilers tiled direct to green chipboard before using these addys? cheers guys im doin the job tomorow and its a 1st job for a new contact so dont want to make a balls up of it