I'm about to lay a 9'x9' concrete base for a block outhouse. I'd like to put a DPM in the base but am unsure how to go about it.
Should I lay a bed of sand first followed by the DPM before pouring in the concrete or should I pour in half the concrete, then the DPM, then the remainder of the concrete.
As its only an outbuilding I don't intend to screed the floor.