right guys, thanks for the constructive comments.
I have used SLC for a few UFH jobs and it is truly up there with some of the worst products i have ever came across. After 48 hours, walking over it. it sounds like your are walking over broken biscuits. You can poke your finger through it even after 48 hours drying (in a heated room). It crumbles like wet paper. Try doing that to a sand and
cement screed after 48 hours. You wont have any fingers left. Floor screeding and wall rendering was once part of a tiling apprenticeship. Get a job like that and you can charge what you like! more often than not i have made more off of screeding than i have made off of tiling! Personally i couldn't trust the SLC as far as i could throw it. Basically water down screed, you expect that to have the same strength as a traditional screed? What is Surprising is the amount of people that have faith in watered down
cement? surely i cant be the only not to?
Anyhow after a difficult conversation today, i have agreed to reimburse the customer the cost of the ufh, controller and the sparks wages, in order to cut the cable and do away with the UFH. As appose to strip the whole floor and start again. Controller wasn't wired up, i have a spare probe. So i can return that.
I think that it is ironic that the thread description of simple job wrong has came to prove, that this is a simple job gone wrong.
15 year tiling, i have never seen a bathroom sheeted in 18mm ply on the walls. in 15 year i have never had to drain a 5000 litre heating system ( to move a heating pipe 50mm!)
The lesson to take home here kids, is....
"Always expect, the unexpected"