Mechanical Inspections

Mechanical Inspections and Definitions:

Residential

  • Mechanical Temp. This is generally the first inspection made on a new construction house or a residental remodel/addon. Everything that will be covered by finishing material such as sheetrock will be inspected for compliance prior to cover up. This includes ductwork, return air, ventilation, freon piping, low voltage wiring, vents, etc. 
  • Rough-in Gas. After the gas piping is completed it must be leak tested. The standard method is an air test of 30 psi for a minimum of 10 minutes to a maximum of 24 hours.
  • Temporary Gas. As the name implies, this is a temporary inspection which allows MLGW to set a gas meter or unlock a gas meter in order to use gas appliances during the construction or remodel of a residence. The requirements for this inspection are to have at least one gas appliance connected to the main gas line and all other connections capped off. The gas vents for the appliances must also meet code in order to be operated safely during construction. 
  • Final Gas. After all gas appliances are connected a final inspection will be made. This includes all gas furnaces, water heaters, fireplaces, and cooking appliances. 
  • Mechanical Final. This is the last inspection to be made by the mechanical department and includes all heating and air conditioning equipment, all finish items such as thermostats, grilles, registers, and ventilation covers and caps. The final gas and mechanical inspections are required before calling in for a building final or certificate of occupancy.

Commercial

  • Above Ceiling. Most commercial buildings incorporate a 'drop ceiling' design where the ductwork is between the roof and the ceiling tiles. An above ceiling inspection allows the ceiling grid and tiles to be installed and the ductwork to be covered up.
  • Rough-in Gas. After the gas piping is completed it must be leak tested. The standard method is an air test of 30 psi for a minimum of 10 minutes to a maximum of 24 hours.
  • Temporary Gas. Allows MLGW to set or unlock a gas meter in order to use gas appliances during the construction of a commercial building. At least one appliace must be attached to the main gas line and all other openings capped off. Gas vents will also be inspected at this time.
  • Fire/Smoke Dampers. All required dampers must be inspected for proper installation and operation.
  • Grease Duct. Any commercial building with cooking equipment that requires a grease hood must have a grease duct inspection. Proper clearances and liquid tight welds will be inspected before any portion of the duct is covered up.
  • Smoke Detectors. All required smoke detectors will be tested using canned smoke. All audio/visual indicators and system shutdown must be operational for this test to pass. The Town of Collierville Fire Marshall must also approve the smoke detector test when required.
  • Partial Inspections. Partial inspections will be done as needed to accommodate the progress of the project. Partial inspections need to be requested in an organized manner. The request of a partial inspection needs to include as large of a section as possible for each inspection.
  • Approved Plans. Any changes or deviations from the stamped approved plans must be approved by the design professional engineer by means of a stamped and signed engineer’s letter.
  • Final Gas. After all gas appliances are connected a final inspection will be made. This includes all gas furnaces, water heaters, fireplaces, and cooking appliances. 
  • Mechanical Final. This is the last inspection to be made by the mechanical department and includes all heating and air conditioning equipment, all finish items such as thermostats, grilles, registers, and ventilation covers and caps. The final gas and mechanical inspections are required before calling in for a building final or certificate of occupancy.
Town of DemoCollierville
    • Town Hall Location

      500 Poplar View Parkway
      Collierville, TN 38017

      Mon – Fri: 8AM – 5PM
      Phone: 901-457-2200

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