§ 7918

The drainage pipes shall be so designed and constructed as to be proof, for a reasonable life of the building, against leakage of water or drain air due to defective materials, imperfect connections, corrosions, settlements, vibrations of the ground or building, temperature changes, freezing or other causes.47 Del. Laws, c. 184, § 15; 16 Del. C. 1953, § 7918;