Standards of Practice
The International Standards of Practice for inspecting the Doors, Windows, & Interior is located at www.nachi.org/sop.
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Electrical
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/unsupported_conductors-768x576.jpg)
Inadequately-supported conductors.
Plumbing
Observation
Inadequate/improper drain pipe slope.
No cleanouts installed.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/3a.-Appliance-connector-to-PVC-768x512.jpg)
Improper fittings.
- Appliance connector to PVC.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/4a.-PVC_to_galvanized_steel-768x512.jpg)
Improper pipe material.
PVC is not an acceptable gas supply pipe material.
Appliance connectors (orange corrugated pipe) should not be used as in-line gas pipe. It is to be used only to connect a gas-fired appliance, to the shut-off valve.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/5a.-Mixing_colors-768x512.jpg)
Improper pipe configuration.
- Mixing PEX pipe colors.
- Typically red is hot water and blue is cold. Mixing colors will complicate tracing pipes and diagnosing problems.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/4a.-PVC_to_galvanized_steel-768x512.jpg)
Observation
Improper pipe connections.
- Different metals in contact with each other in the presence of moisture causes galvanic corrosion.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/6A.-Steel_to_copper-768x512.jpg)
Steel supporting copper
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/6b.-Steel_to_coplper_support-768x1152.jpg)
Steel supporting copper.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/6c.-Steel_to_copper-768x1152.jpg)
Steel to copper.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/6d.-Copper_to_CSST_gas-768x512.jpg)
Copper to CSST gas line.
Observation
Improper support/pipe combinations.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/7a.-Metal_supporting_PEX-768x512.jpg)
Steel supporting PEX.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/7b.-Metal_supporting_PVC-768x512.jpg)
Steel supporting PVC.
Non-Defect Conditions
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/8a.-ABS_1-768x512.jpg)
Acrylonitrile-Butadiene-Styrene, commonly called “ABS”, is a black plastic pipe widely used across North America as drain, waste, and vent (DWV) pipe.
Welding solvents used to connect PVC won’t necessarily work with ABS so you should see connections made between these two pipes as shown in the photo above.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/8a.-ABS_2-768x291.png)
ABS is generally not used/available in south Florida but is extremely common over much of the US. You can recognize it from markings on the side of the pipe.
Observation
![Observation](https://www.nachi.org/school/wp-content/uploads/sites/2/2018/04/9.-Hanger_types-768x512.jpg)
PVC Support Types
Both metal and plastic hangers are acceptable for supporting PVC drain pipes.