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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations 2 Methods for on-site completion and finishing of these elements are included in the approved design.
3 Complete installation instructions and the required materials for finishing these elements are provided.
18. In 3280.504, add paragraph a3
and revise paragraph b introductory text to read as follows:

a
3 In multi-story manufactured homes, the ceiling vapor retarder is permitted to be omitted when the story directly above is part of the same manufactured home.
b Exterior walls. Exterior walls must be provided with a system or method to manage moisture and vapor accumulation with one of the elements in paragraphs b1 through 4 of this section. For purposes of the requirement in this paragraph b, the fire separation wall between each attached manufactured home must be considered to be an exterior wall. See subpart K of this part

19. Amend 3280.506 as follows:
a. Redesignate paragraphs a, b, and c as paragraphs b, c, and d, respectively;
b. Designate the introductory text as paragraph a;
c. In newly designated paragraph a:
i. Remove of this subpart;
ii. Remove figure 506 and add figure 1 to this paragraph a in its place; and iii. Add a heading for the figure.
d. In newly redesignated paragraph b:
i. Remove the heading;
ii. Add a comma between ventilation and and;
iii. Remove below and add in the table to this paragraph b in its place;
and iv. Add a heading for the table; and e. Revise newly redesignated paragraph c.
The revisions and additions to read as follows:

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Heat loss/heat gain.

a
Figure 1 to Paragraph a b
Table 1 to Paragraph b

c To assure uniform heat transmission in manufactured homes, cavities in exterior walls, floors, and ceilings must be provided with thermal insulation. For insulation purposes, the fire separation wall between each single
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3280.602

Definitions.

3280.504 Condensation control and installation of vapor retarders.

3280.506

family attached manufactured home shall be considered an exterior wall see subpart K of this part.

20. In 3280.602, add alphabetically the definition for Indirect waste receptor to read as follows:

Indirect waste receptor means a receptor that receives a discharge waste pipe that is not directly connected to a receptor but maintains a suitable air gap between the end of the pipe and the top of the drain.

21. In 3280.608, revise paragraph b to read as follows:
3280.608

Hangers and supports.

b Piping supports. Piping must be secured at sufficiently close intervals to keep the pipe in alignment and carry the weight of the pipe and contents. Unless otherwise stated in the standards incorporated by reference for specific materials at 3280.604a, or unless specified by the pipe manufacturer, horizontal plastic drainage piping must be supported at intervals not to exceed 4 feet and horizontal plastic water piping must be supported at intervals not to exceed 3 feet. Vertical drainage and water piping must be supported at each story height.

22. In 3280.609, revise paragraph c1iii and add paragraph c1iv to read as follows:
3280.609

Water distribution systems.

c
1
iii Relief valves must be provided with full-sized drains, with cross sectional areas equivalent to that of the relief valve outlet. The outlet of a pressure relief valve, temperature relief valve, or combination thereof, must not be directly connected to the drainage system. The discharge from the relief valve must be piped full size separately to the exterior of the manufactured home, not underneath the home, or to an indirect waste receptor located inside the manufactured home. Exterior relief drains shall be directed down and shall terminate between 6 and 24 above finished grade. Drain lines must be of a material listed for hot water distribution and must drain fully by gravity, must not be trapped, and must not have their outlets threaded, and the end of the drain must be visible for inspection.

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iv Relief valve piping designed to be located underneath the manufactured home is not required to be installed at the factory provided the manufacturer designs the system for site assembly and also provides all materials and components including piping, fittings, cement, supports, and instructions for proper site installation.

23. In 3280.610, add headings to paragraphs c1 and 4 and revise paragraph c5 to read as follows:
3280.610

Drainage systems.

c 1 General.

4 Size Requirement.
5 Preassembly of drain lines.
Sections of the drain system, designed to be located underneath the manufactured home or between stories of the manufactured 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.

24. Amend 3280.611 as follows:
a. Remove the comma at the end of paragraph c1i and add a semicolon in its place; and b. Revise paragraph c1ii.
The revisions to read as follows:
3280.611

Vents and venting.

c
1
ii A 112-inch diameter min.
continuous vent or equivalent, indirectly connected to the toilet drain piping within the distance allowed in paragraph c5 of this section for 3
inch trap arms through a 2-inch wet vented drain that carries the waste of not more than one fixture. Sections of the wet vented drain that are 3 inches in diameter are permitted to carry the waste of an unlimited number of fixtures; or

25. In 3280.612, amend paragraph a to read as follows:
3280.612

Tests and inspection.

a Water system. All water piping in the water distribution system must be subjected to a pressure test. The test must be made by subjecting the system to air or water at 80 psi + or 5 psi for 15 minutes without loss of pressure.

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