Plumbing and Drainage Code Guide and Glossary Industry Terms

The Code Guide paragraphs in this booklet describe plumbing devices which are normally used in plumbing and drainage systems, and should be included when plumbing codes are written and adopted. The Plumbing and Drainage Institute has listed these paragraphs so that they include the following basic information, plus any additional information required for specific product : Definition-A general description of the device and its intended use. Construction-How the device should be constructed, and of what materials. Installation-Recommendations regarding where and how the device should be installed. Construction: Fixed air gap fittings shall be made of durable corrosion resistant materials. Installation: An approved backwater valve shall be installed on the main horizontal building drain, downstream from any branch with openings that may be subjected to flooding, or an approved backwater valve shall be installed on each branch with openings that may be subjected to flooding. The backwater valve shall be located in the line where it shall be accessible for inspection and repair at all times. Water Closets-Supports for off-the-floor closets shall be a combination waste fitting and support assembly and incorporate as a minimum a support structure complete with fasteners to mount and connect the closet, fitting and conduit means for carrying the waste from the closet into the waste line, means to tie the assembly to the structural floor slab, any necessary gasketing, and the combination shall provide an assembly that will support the fixture independent of the wall or partition and that can be fully concealed in the building a construction.