Shower insert faucets come from wall facing another room. Roof over shower is extension of roof and is Flat, just plywood and roofing materials.There is no open space up there. Shower use creates water coming out of the ceiling..wood ceiling. There is no room for pipes In ceiling. There is a vent pipe on roof a few feet away.Also was told there is a valve between bath and bedroom wall.When water on takes a few minutes for water to drip from ceiling.?????