The Minnesota Building Codes and Standards Division has
recently received several inquiries concerning installation of
drain/waste piping on-site under manufactured homes.
Question #1: Are drain/waste systems under new
manufactured homes allowed to be shipped without being connected
under the new manufactured homes?
Answer: Yes in accordance with Code of Federal Regulations
(C.F.R.), 3280.610(e)(5), "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, components,
including piping, fittings, cement, supports, and instructions
necessary for proper site installation." On new manufactured
homes the manufacturer shall supply all materials and a Design
Inspection Primary Inspection Agency (DAPIA) approved drawing
indicating how the drain system is to be completed on site. Also
note, C.F.R. 3280.610(c)(1, 2, & 4), that a manufactured home
shall have only one (1), three inch drain outlet.
Question #2: Is it acceptable to block/support drain
lines under the manufactured home with concrete blocks lying on
the ground?
Answer: No, in accordance with C.F.R. 3280.680(b) and (c)(1, 2,
& 3), plastic drainage piping shall be supported at intervals
not to exceed 4 feet, and piping shall be securely attached to
the structure by hangers, clamps, or brackets which shall not
compress, distort, cut, or abrade the piping.
Question #3: What ABS or PVC materials are allowed to
be used for drain/waste lines under a manufactured home?
Answer: In accordance with C.F.R. 3280.604(b), ABS materials
marked ASTM D-2661-91, ASTM D3311-91, and ASTM F-628-91 and PVC
materials marked ASTM D2665-91b, may be used under new
manufactured homes for drain/waste lines. If you are reworking
or reinstalling a used manufactured home the above referenced
materials may be used and Minnesota Plumbing Code 4715.0580 also
allows ABS marked ASTM F628 and PVC marked ASTM F891, or D2949
or D1785 or D2241. (Installation shall be in accordance with
referenced codes and applicable material standard."
Question #4: Are Licensed Manufactured Home Installers
required to file a $25,000.00 Plumbing Code Compliance Bond with
the Minnesota Department of Health, Plumbing Code Division when
including building drain and water connections in installation
contracts for manufactured homes.
Answer: No, if the only work being completed by the licensed
manufactured home installer is the installation of the building
drain and connection to the building sewer, and the installation
of the water distributing pipe connection to the water service
pipe. The installation of the building sewer and water service
and any other plumbing shall be performed by any person(s) who
have provided evidence of the $25,000 plumbing code compliance
bond. Plumber licensure or pipelayer certification may be
required for persons performing plumbing or the installation of
water service or building sewer piping in cities with a
population of 5,000 or greater.
Note the following definitions from Minnesota Plumbing Code,
Chapter 4715.0100.
Subp. 24. Building drain. "Building drain" means that part
of the lowest piping of the drainage system which received the
discharge from soil, waste, and other drainage pipes inside the
walls of the building and conveys it to the building sewer
beginning at least one foot outside the building footings.
Subp. 27. Building sewer. "Building sewer" means that 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.
Subp. 123. Water distributing pipe. "Water distributing
pipe" means a pipe conveys water from the water service pipe to
the point of usage.
Subp. 125. Water service pipe. "Water service pipe" means
the pipe from the water main or other source of water supply to
the water distributing system of the building served.
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