Top Left: Underground pipe shown wrapped in wax coated corrugated paper prior to pouring of perlite concrete insulation. 

Top Right: Pipe elbows shown wrapped in double wraps of foil faced fiberglass insulation.  Straight lengths of wax coated corrugated cardboard piping are show at right of photo. 

Bottom Left: Expansion loop wrapped in double layers of foil faced fiberglass prior to pouring of perlite insulating concrete. 

Bottom Right: Expansion loop following pouring of perlite insulating concrete prior to overwrapping with PVC membrane.