Underground
To be made after trenches or ditches are excavated and bedded, piping installed, and before backfill is put in place. When excavated soil contains rocks, broken concrete, frozen chunks and other rubble, which would damage or break the piping, or cause corrosive action, clean backfill shall be on the job site.

Rough-In
To be made after the roof, framing, fire stopping and bracing are in place and all ducting and other components, which may be concealed, are complete, and prior to the installation of wall or ceiling finish material.

FINAL
To be made upon completion of the mechanical and/or gas piping systems.

NOTE:
Before any system of gas piping is finally put in service, it shall be carefully tested to ensure that it is gas tight. Where any part of the system is to be enclosed or concealed, this test shall precede the work of closing in. To test for tightness, the piping shall be filled with air or inert gas. Oxygen shall never be used for this test.

Click Here to download an application for a mechanical permit (pdf file format)