Plumbing and Electrical Cables are fitted into the polystyrene on the inside of the walls after the walls are roof are completed.

The polystyrene is easily grooved back to the concrete core and the plumbing pipes and fittings can be fitted and fixed back to the wall prior to the plaster sheeting being installed.

Some electricians like a wider space around the electrical cables and so use a heat gun to melt a 75mm gap in the polystyrene.

Both plumbing pipes and cables are placed in the ceiling then placed down the walls directly over the fittings.