It’s a Trap
From a recent home inspection.
Here we have an improper trap installation. The trap seal is too deep and the actual trap is installed backwards.
Both “Model Plumbing Codes” (UPC/IPC) specify that the trap seal should be between 2 to 4 inches (with exceptions).
Because of the increased depth and capacity, they are more resistant to flow from the fixture. This will impede drainage and make the fixture drain more likely to build up sludge.
2015 IPC
1002.4 Trap Seals
Each fixture trap shall have a liquid seal of not less than 2 inches (51 mm) and not more than 4 inches (102 mm), or deeper for special designs relating to accessible fixtures.
2015 UPC
1005.0 Trap Seals.
1005.1 General. Each fixture trap shall have a liquid seal of not less than 2 inches (51 mm) and not more than 4 inches (102 mm), except where a deeper seal is found necessary by the Authority Having Jurisdiction. Traps shall be set true with respect to their liquid seals and. where necessary, they shall be protected from freezing.
Typically the deeper trap seal exception is for those area that are remote and have the potential to evaporate the trap seal or with a fixture or piece of equipment calls for an indirect waste connection. These trap configuration will need approval from the AHJ.
If you find any errors or have additional information that would expand on any code, building standards or manufacturer requirements please let me know.
NCW Home Inspections, LLC is a Licensed Washington State Home Inspection service located in Wenatchee Washington serving Chelan County, Douglas County, Kittitas County, Okanogan County and Grant County Washington and the cities of Wenatchee, Leavenworth, Cashmere, Oroville, Cle Elum, East Wenatchee, Quincy and many more…
Your Wenatchee and Chelan Professional Real Estate, Home and Structural Pest Inspection Service
Coordinator & Instructor- Fundamentals of Home Inspection- Bellingham Technical College
Former WA Home Inspector Advisory Licensing Board
www.ncwhomeinspections.com 509-670-9572
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