A.
Label
of Compliance. Approval for installation of any manufactured dwelling
is limited to units manufactured after June 15, 1976 and bearing a
label from the Department of Housing and Urban Development indicating
compliance with electrical, plumbing and structural standards as set
forth by H.U.D.
B.
State
Standards. Installation of manufactured dwellings are to follow State
of Oregon standards adopted and administered by the State Building
Code Agency. See OAR 814-34-050 to 814-23-080. These state standards
are summarized as follows:
1.
Support
blocking shall be installed according to the manufacturers' instructions
approved by the State Building Codes Agency and, unless higher loading
requirements are justified by soils analysis, the blocking shall support
the manufactured dwellings on a soil with a bearing capacity of 1,500
pounds per square foot. OAR 814-23-060.
2.
Plumbing,
electric and gas service connections shall be made according to the
instructions approved by the State Building Codes Agency. OAR 814-23-050.
3.
A
single-wide manufactured dwelling in certain listed areas along the
coast and the Columbia River shall be tied down with devices that
meet federal standards as approved by the State Building Codes Agency.
OAR 814-23-065.
4.
Manufactured
dwelling accessory buildings and structures shall comply with state
construction and installation standards. OAR 814-023-070. Manufactured
dwelling accessory structures are skirting, some porch and steps,
awnings, cabanas and some carports. In the manufactured dwelling field,
an awning is not a sunshade for a window, but is any structure with
a roof and not more than one wall. A structures is a manufactured
dwelling accessory structure if it depends in part on the manufactured
dwelling for its structural support. Accessory structures are not
required by the state, but must meet standards if installed.
5.
A
building or other structure associated with a manufactured dwelling
that is not a manufactured dwelling accessory structure must comply
with state building code standards for ramadas to relate the ramada
to the manufactured dwelling. OAR 814-23-0[3]70. A ramada is primarily
a roof built to go over a manufactured dwelling but is not supported
by the manufactured dwelling.
C.
Tie-Down
Requirements (to Exclude Manufactured Dwellings Attached to Basements).
1.
Minimum
tie-down requirements are to conform to standards established by the
State Building Codes Agency.
2.
Minimum
number of tie-downs required:
a.
Single-wide: as specified by state code plus cross tie-downs at no
greater than 12 foot intervals.
b.
Double-wide: one at each corner plus cross tie-downs at no greater
than 12 foot intervals.
c.
Triple-wide: three per side on outside units plus cross tie-downs
at no greater than 12 foot intervals.
3.
Tie-Down
Materials. Steel straps or cables that have been treated to make them
weather resistant must be used for ties.
4.
Anchors.
Anchors must have a rod made of steel not less than five-eighths inch
in diameter, and must have a tensioning head or a drop forged, closed
eye for use with a turnbuckle. In addition, it must be able to withstand
a pull of at least 4,800 pounds without failure. All anchors should
be installed as nearly vertically as possible. The heads of the anchors
should come to rest next to the concrete, and should be directly below
the "I" beam of the manufactured dwelling frame.
D.
Grade.
The portion of the lot on which the manufactured dwelling shall rest
must be leveled to a +-3" variance from the mean elevation. This leveling
shall expose an area of bearing soil or fill material so compacted
as to receive approval by a soil engineer as meeting state requirements.
E.
Supports.
Bearing weight of manufactured dwellings shall be supported by one
of the following:
1.
Types.
a.
Placing on a permanent concrete or block basement, or perimeter foundation.
Standard floor beams will be used across the width of the foundation.
"I" beams of the manufactured dwelling floor shall be secured by lag
bolts at each juncture of an "I" beam with foundation floor beams.
b.
Placing upon concrete block piers, each of which rests upon a continuously
poured concrete ribbon six inches in depth and 16 inches in width
extending the full length of the manufactured dwelling less one foot.
Each ribbon must contain a minimum of two reinforcing bars of at least
one-half inch in diameter. One ribbon is required under each longitudinal
"I" beam member of the manufactured dwelling's floor frame structure.
F.
Extensions.
1.
Cabanas,
expando units, patio awnings, carports, and other manufactured dwelling
extensions, shall be considered part of the manufactured dwelling
in determining setbacks.
2.
All
manufactured dwelling extensions shall be installed in accordance
with plans approved by the State Building Codes Agency.
3.
Extensions
must be secured by tie-downs in the same manner as the manufactured
dwelling; a minimum of one tie per corner of the extension.
G.
Skirting.
1.
Skirting
shall be weather resistant, noncombustible or not more combustible
than three-eighths inch exterior grade plywood.
2.
Untreated
wood shall not be nearer than six inches to any earth, unless separated
by three inches of metal or concrete. EXCEPTION: For metal skirting,
supporting members of untreated lumber shall be separated from the
ground by not less than two inches.
3.
Adequate
access shall be provided.
4.
Ventilation
openings shall be provided for each 25 linear feet of skirting.
5.
Each
opening shall have a minimum net area of 36 square inches and shall
be located within two feet of the external corners of the manufactured
dwelling and shall have a corrosion resistant louver or mesh cover.
6.
Skirting
shall be completed within 90 days after placement of the manufactured
dwelling.
H.
Ramadas
shall be considered as part of the structure in determining setbacks;
they shall conform to all requirements of the statewide building code
and shall be constructed to allow the manufactured dwelling to be
moved.
(Ord. 73E § 9.010, 1992)