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.
Structure Delaware Code
Chapter 79. BASIC PLUMBING PRINCIPLES
§ 7902. Principles applicable throughout State.
§ 7903. Plumbing Code; adoption and enforcement.
§ 7905. Additional regulations.
§ 7907. Inspection and inspectors.
§ 7910. Cross connections with unsafe water supplies.
§ 7911. Adequate water supply.
§ 7913. Hot water tanks or boilers.
§ 7914. Separate sewer connections.
§ 7915. Family private water closet in multiple dwellings.
§ 7916. Plumbing fixture materials.
§ 7917. House drainage system.
§ 7919. Cleanouts in drainage systems.
§ 7921. Adequate air circulation.
§ 7922. Roof terminals, soil or waste stacks.
§ 7923. Water or air pressure test.
§ 7924. Substances entering house drainage system.
§ 7925. Connections with refrigerators.
§ 7926. Light and ventilation.
§ 7927. Private sewage treatment and disposal system.