I am building a single storey extension involving boiler relocation new cloakroom and kitchen extension so ie water feeds, rads etc . the corgi fitter was keen on the idea of putting water pipes rad feeds under screed , have done some research on here and see in general its a bad idea to bury water pipes under screed but heating pipes are ok as droping rad feeds gives a poorer flow ( current system micro bore) and could be prone to blocking am i correct with this as i would prefer to pour the floor slab in one without screed. but dont want to upset him by saying on diy.. etc without being sure of the facts . Many thanks all