If the grade is not specified in the construction drawings or project specifications, where can it be obtained?

The local plumbing inspector is the most reliable source for obtaining grading specifications when they are not specified in the construction drawings or project specifications. Inspectors have an in-depth understanding of local codes and regulations, which often include grading requirements that must be adhered to during plumbing installation. These officials are responsible for ensuring all plumbing work meets local standards, so they can provide the most accurate and applicable information regarding the necessary grades for drainage and venting systems.

While a contractor may have experience and knowledge about grading, their interpretation can be influenced by various factors unique to the project. A universal plumbing guide may provide general information but does not account for local codes and specific site conditions. Consulting the building architect could yield some design insights, but they may not have the detailed code knowledge or experience with grading requirements specific to plumbing installations that the local inspector possesses. Therefore, the local plumbing inspector is the best point of contact for this information.