Drain, waste, and vent pipes are sealed to the 15 mil vapor and air barrier with rubber gaskets.
The essence of Passive House–or any kind of excellence in building–is attention to detail. Here is a prime example: air tight design, even under a concrete slab. If there is any hope hitting that hitting that important mark of 0.6 ACH@50PA–almost hermetic construction–it will be achieved by sealing every penetration in the building envelope.
the tight fitting gasket is caulked to the pipe, just for insurance!
Final preparations for pouring concrete include 9″ of geo-foam, and wire reinforcement. The trough at the left is for thicker concrete to support interior bearing walls and columns. There is an additional 9″ of insulation under the trough.