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)