Every drain pipe should have a proper slope to drain off the night soil or waste water by gravity.
Vertical stacks should be truly vertical. They enhance the appearance of the building.
Horizontal sewer lines must be truly in line and at the required gradient, to maintain the smooth flow and to avoid the stagnation of flowing material.
All vertical stacks should be properly clamped. Sufficient number of clamps should be provided at each floor height, to maintain the vertically of the vertical stacks.
All pipe joints and the respective fittings should be properly filled, to avoid leakage problems and the resultant maintenance.
Trap joints that are embedded in water-proofing should be done with lead joints.
Rest of the joints may be done with cement joints.
Use solvent solution joints for P.V.C. pipes.
