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The Minnesota Construction Codes and Licensing
Division has learned that on-site testing of drain/waste lines
on manufactured homes is not being conducted in a uniform manor
in Minnesota. Bulletin #36 is intended to help clarify the
manner in which the drain/waste lines are to be tested when the
home is installed at the site of occupancy.
When the manufactured home is constructed at the manufacturing
facility, its drainage system is required to be tested in
accordance with the HUD Code of Federal Regulations (CFR)
3280.612 (b). CFR 3280.612 (b) requires the drainage system to
be tested at the production facility by one of three methods. |
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1. |
Water test. Before plumbing fixtures are connected, all of
the openings into the piping shall be plugged and the entire
piping system subjected to a static water test for 15 minutes by
filing it with water to the top of the highest vent opening. |
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2. |
Air test. After all fixtures have been installed, the traps
filled with water, and the remaining openings securely plugged,
the entire system shall be subjected to a 2-inch (manometer)
water column air pressure. |
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3. |
Flood level test. The manufactured home shall be in a level
position, all fixtures shall be connected, and the entire system
shall be filled with water to the rim of the water closet bowl
(tub and shower drains shall be plugged). After all trapped air
has been released, the test shall be sustained for not less than
15 minutes without evidence of leaks. The system shall be
unplugged and emptied. The waste piping above the level of the
water closet shall then be tested and show no indication of
leakage when the high fixtures are filled with water and empty
simultaneously to obtain maximum possible flow in the drain
piping. |
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CFR 3280.610 (c)(5) Preassembly of drain lines.
Sections of the drain system, designed to be located underneath
the home, are not required to be factory installed when the
manufacturer designs the system for site assembly and also
provides all materials and components, including piping,
fittings, cement, supports, and instructions necessary for
proper site installation.
Minnesota State Building Code (MSBC) 1350.3400 subpart 2,
states in part "Waste piping to the manufactured homes shall
comply with the Minnesota Plumbing Code (MPC), chapter 4715.
This indicates that waste piping (on-site drain waste lines) of
the manufactured home shall be installed and tested to MPC 4715.
If the manufacturer of the home complies with CFR 3280.610 for
"Preassembly of drain lines" the construction of the drain waste
line on-site must follow manufacturer's instructions sent with
the manufactured home. If the drain waste lines on-site to not
follow the manufacturer's instructions they must be completed in
accordance with MPC Chapter 4715. MPC 4715.0100 subpart 27, "Building
Sewer" means the part of the drainage system which extends
from the end of the building drain and conveys its discharge to
the public sewer, private sewer, individual sewage-disposal
system, or other point of disposal.
The "building sewer" (from drops under the home to point of
disposal) would be required to be tested in accordance with MPC
4715.2820. The manufactured home (from the drops under the home
throughout the home) drainage system is required to be tested in
accordance with CFR 3280.612 (b). Manufactured home proposed
federal installation standards CFR 3285.604 (d) will require the
tests of the home drain system be completed after installation
of the home at the site of occupancy.
MPC 4715.2810 requires a minimum of eight (8) hours of
notification prior to
inspections or testing from the plumbing contractor to the
proper administrative authority. If the proper administrative
authority does not appear for an inspection within 24 hours of
the notification (excluding weekends and holidays) the
inspection or test shall be deemed to have been made, and the
plumbing contractor is required to file an affidavit with the
proper authority stating the work was completed according to
code and required tests were completed and system was free
from leaks.
Minnesota Statute (MS) 326.40, Piping work from the factory
provides connections to the point of disposal require that the
work be completed by a licensed plumber/plumbing contractor
or by a person with an unlicensed contractors plumbing bond.
A licensed manufactured home installer completing connections to
a manufactured home would be required to obtain and maintain an
unlicensed contractors plumbing bond.
In conjunction with this bulletin also please refer to
manufactured home informational
bulletin No. 30 issued in September
1999 (still in effect).
Bulletin No. 30 discusses on-site connections and materials and
who is allowed to perform some of the connections.
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