I am working on a project where the underground sanitary main needs to be replaced. The main is inside a strip mall and goes through five tenant spaces. The owner would like to install upflush toilets and have the new 4" pvc sanitary main run above the suspended ceiling to avoid having to bust up the concrete slab inside the tenant spaces. Should we be worried about the sanitary main freezing as there is no heat above the suspended ceiling or will enough heat from the heated space go up through the suspended ceiling? Thanks.
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