shower drain location

[gravelrash]

Anyone laid a drain for shower when building a passive slab? need to locate the pipe in final position before concrete pour but is there a way to ensure you can move the pipe +/- a couple of inches if not in exact position. 

[cherryfountain]

I used 100mm bore pipe insulation with 50mm wall thickness on all my soil pipes coming up through the slab .

Just make sure they are wired or large cable tied to the pipe to stop them popping up when the concrete is poured .