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HomeMy WebLinkAboutA007 - Letter dated November 24, 1991 to City Council - anchorage of Manufactures homes Ii"'Ei11 CITY OF AMES , IOWA 50010 FILE© `'�'� 77 November 24, 1992 NOV 2 41992 w,..� CITY OfYAMES ROVVA The Honorable Larry R. Curtis, Mayor, and Members of the City Council of the City of Ames, Iowa Re: Anchorage of Manufactured Homes Dear Mayor Curtis and Council Members: With this is a copy of Section 16.626 IAC, which is the state law on anchor- ing manufactured homes. You can compare it with §29.20(16) of the Ames Code on tie down. You will see that the state law goes into greater technical specificity. However, the state law sets the technical standard of care and legally pertains to installation of all mobile homes, whether the installa- tion occurs in a new or long established park. Yours truly, John R. Klaus City Attorney 515 Clark Avenue, P.O. Box 811 Ames, Iowa 50010 (515) 239-5146 JRK:gmw Attachment cc: Brian O'Connell AMES - THE CENTER OF IT ALL IAC 11/16/88 Public Safety[661] Ch 16, p.35 16.625(4) Other inspections. The commissioner or the commissioner's designee shall make periodic inspections of the facilities of persons who are subject to these rules and regulations, when it appears that a person is not in compliance with this code. 16.625(5) Fees. All remittances shall be in the form of checks or money orders, payable to: Treasurer, State of Iowa and delivered to: Building Code Commissioner State Building Code Department of Public Safety Wallace State Office Building Des Moines, Iowa 50319 a. Installation seal . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .$12.50 b. Installation replacement seal . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .$ 7.50 c. Installer certification initial fee . .. . ... . . . . . . .. . . . . .. .. .. . . . . . . . . ... . . . . . . $30.00 d. Annual installer renewal certification fee .. .. . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . $15.00 e. Ground support and anchoring system approval fee . . . . . .. ... . . . .. .. . . .. . . . $65.00 f. Verification inspections made by the state building code staff will be charged at a rate based on time spent at the site plus travel expenses. The hourly rate shall be $30.00 per hour and direct cost for travel. 661-16.626(103A) Support and anchorage of manufactured homes. Manufactured homes shall be installed with support and anchorage as recommended by the manufacturer and required by federal manufactured home construction and safety standards section 3280.306(b). As an alternate to the manufacturer's recommended instructions, a support and anchorage system designed by a registered engineer may be used. Subrules 16.626(1) and 16.626(2) are the minimum requirements for support and anchorage systems which shall apply if a manufac- turer's instructions are not available or for units which were manufactured before June 15, 1976, and no installation instructions are available. EXCEPTION I: Minor adjustments in pier locations may be necessary to avoid utility and service lines. Additional supports may be needed to ensure that the maximum distance between supports and anchors is maintained. EXCEPTION 2: The use of any type of foundation other than a permanent system may be prohibited by the local jurisdiction. 16.626(1) Requirements for support system installations. a. Piers placed on foundations shall be installed and centered directly under the main frame longitudinal beams. The piers should not be further apart than ten feet on centers for manu- factured homes twelve feet wide or less and not more than eight feet on centers for manufac- tured homes over twelve feet wide to less than sixteen feet wide and no more than six feet on centers for manufactured homes sixteen feet wide or more. The main frame, front or back, should not extend further than two feet beyond the center line of the end piers. NOTE: Precaution shall be taken to ensure that no telephone, electrical, plumbing or water lines are contacted when making excavations for footings and piers on private property. Utility line locations shall be verified with the property owners or owner's representative. b. Pier foundations shall be placed below the frost line on level and undisturbed soil, or on controlled fill, which is free of grass and organic materials. (A small amount of sand may be of use to provide a level surface.) All pier foundations shall be set level and piers must be installed plumb. The pier foundation shall be at least a 16" x 16" x 4" solid concrete pad, precast or poured in place,or other approved material. Two nominal 4"x 8"x 16"solid concrete blocks may be used provided the joint between the blocks is parallel to the main frame longitudinal beam. Concrete used in foundations shall have a twenty-eight day compressive strength of not less than three thousand pounds per square inch (3000 P.S.I.). EXCEPTION: Pier foundations may be exempt from extending below the frost line on manu- factured home installations, only if the owner agrees to be responsible for the loosening of the anchor system on or about November 1 to prevent frost heave damage to the unit, and to retighten the anchors each spring. A statement to this effect is on the installation certificates and a space is provided for the owner's signature. Ch 16, p.36 Public Safety[661] IAC 11/16/88 c. Unless otherwise directed by the owner of the site the soil bearing capacity of the site may be assumed to be two thousand pounds per square foot. The acceptable construction under this subrule is based upon a soil bearing capacity of two thousand pounds per square foot. Soils with less capacity will require increased size footings. EXPLANATION: The permissible footing sizes and pier spacing given in this code are based upon a combined live and dead load of sixty-five pounds per square foot of unit.This assumes that the full snow and internal live load will not be present at the same time. d. Piers may be constructed of concrete or undamaged nominal 8" x 8" x 16" concrete blocks, open celled or solid placed on the pier foundation. All open celled concrete block shall be installed with the cells of the block in a vertical position. Nominal 2" x 8" x 16" or nominal 4" x 8" x 16"solid concrete blocks may be utilized as needed, to achieve the neces- sary heights of the piers for a particular installation.A nominal 2" x 8" x 16"wood plate, or equivalent, shall be placed on top of each pier, unless there is at least 4"of solid block, with shims fitted and driven between the wood plate or solid block and the main frame longitudinal beam. The wood blocking shall not occupy more than a nominal two inches of vertical space and shims shall not occupy more than one inch of vertical space. Shims which have a thick- ness of more than three-eighths of an inch shall be hardwood. 1. Piers up to forty inches in height, except corner piers over three blocks high(a nominal 24% may be single block construction and shall be installed transverse (right angle) to the main frame longitudinal beam. (see Figure 1) 2. Piers over forty inches in height but not exceeding eighty inches in height and corner piers over three blocks high shall be double block construction with every other course either parallel or transverse (right angle) to the main frame longitudinal beam. These piers shall be capped with a nominal 16" x 16" x 4" solid concrete block or equivalent. (see Figure 2) Wood blocking and hardwood shims shall be installed accordingly. 3. Piers over eighty inches in height shall be reinforced concrete or double block construc- tion following exactly the procedure given in paragraph number two above. Celled concrete