Chapter 3

• 2% Recommended slope for horizontal drainage pipes.
• 1% Allowable slope for horizontal drainage piping 102 mm or larger in diameter
• 2 pipe sizes Vertical installation of double sanitary tees may be used when the barrel of the fitting is at least

  larger than the largest side inlet
• 45° The bottom of all pipe trenches deeper than the footing of any adjacent building or structure and parallel to it must be at least degrees
• 0.30 m Minimum depth of building sewer below the finish ground level
• 3 m Maximum spacing of vertical supports for copper tubing.
• 1.2 m Maximum spacing of vertical supports for lead pipes.
• 1 m Intervals of vertical supports for plastic pipes.
• 1.5 m Intervals of horizontal supports for cast iron soil pipes.
• 3 m Maximum spacing of horizontal supports for CISP exceeding 1.5 meters
• 0.45 m Supports for cast iron soil pipes shall be placed within of the hub or joint
• 1.20 m Cast iron soil pipes exceeding shall be horizontally supported at least at every other joint.
• 3 m Intervals of horizontal supports for screwed pipes 19mm and smaller
• 3.6 m Intervals of horizontal supports for screwed pipes 25mm dia and larger
• 1.8 m Intervals of horizontal supports for copper tubing 38mm dia and smaller
• 3 m Intervals of horizontal supports for copper tubing 51mm dia and larger
• 0.6 m Clear height of tunnels above the pipe laid in a trench.
• 1/2 the depth of trench or 2.4 m Maximum length of tunnels.
• 0.30 m Trenches shall be backfilled in thin layers of above the top of the pipe with clean earth.