Right, I have the boards down, heating mat down and tested and one layer of Mapei screed...trouble is, the screed only partially covers most of the cables after a few have risen about 2mm above. I know i can use adhesive on the porcelain tiles when laying which will obviously remove the risk of cutting the cables - but i am more worried that the job isn't being done properly - the conductive properties of the screed, depth (which is 5-6mm), the fact that i can't apply adhesive to the floor etc.
Question is, with the total thickness in mind,can i get away with applying adhesive to the tiles - or am i an idiot for not chucking another bag of screed down?