I took some water pipes (both hot and cold) from the house to the outbuilding. From the house, plastic pipe leaves the building. it is buried only 150mm max, maybe less, covered in wickes 13mm lagging. It was not buried further as the drain got in the way and crossed my path.
inside the outbuilding is single concrete block with 25mm rockwool insulation, then plasterboard and plaster. the pipe (copper) is attaced to the plasterboard covered again with 13mm wickes lagging.
Is this sufficient to leave the water running (is not isolated). Will this prevent freezing? One one side, there is a toilet also. I will monitor regularly to see if the cistern water freezes.
Many thanks in advance.