Manufactured home attachments to foundation walls
Manufactured Structures Bulletin Number 29 (with additional memo attached)
To: |
Manufacturers, Manufactured Home Dealers, Installers, and Building Officials |
From: |
Elroy Berdahl |
Date: |
July 22, 1999 |
Subject: |
Manufactured home attachments to foundation walls |
We are enclosing copies of the various foundation (basement) wall designs acceptable per the Minnesota State Building Code. These designs each have limiting characteristics and must be used as written. The basic limiting factor of each design is that the soil load is 30 pounds per cubic foot fluid weight. If the soil conditions at the home site are greater than this or the fill differential is greater than the given design, a registered engineer is required to design the basement wall. The methods of attachment of the manufactured home to the foundation are just a basic recap of the submittals by the various manufacturers. Most of the manufacturers have referenced the One and Two Family Dwelling Code in their drawings. Make sure when constructing, pricing, or inspecting a basement and framing of any home that all connections and structural elements of the manufacturers' approved design or empirical design or engineers design are incorporated. The enclosed empirical designs from the building code are not to be used in place of the specific design requirements of the manufacturer but are to be used when the manufacturers' design references local building codes. Installers rolling or craning homes on foundations are required to place support seals on the home. The installer bolting, lagging, screwing or nailing the home to the sill or basement wall is required to place an anchoring seal on the home. The exception to this requirement is if the home is installed on a permanent foundation and building permits are issued and inspections are made of the installation. The fastening described below is only the connection of the home to the sill plate, be sure to read all instructions, drawings and details that the manufacturer supplies with the home for complete fastening requirements. Recap of manufacturers' method(s) of home installation on basements.
FOUNDATION REQUIREMENTS PER MINNESOTA BUILDING CODE 13003.1900. Notes 8. Floor framing must be nailed to the sill in accordance with Uniform Building Code Table 23-II-B-1 or Table R-402.3a of The One and Two Family Dwelling Code. In addition approved metal angle clips must be fastened to floor joists, trusses or blocking to the sill plate at anchor bolt locations. The clip must not be less than 18 gauge and be fastened to the plate and adjoining joists, trusses or blocking with three (3) 1½ inch by 8d nails in each leg of the clip 9. Foundation walls must not exceed a height of 8½ feet, as measured from the basement floor. Height of unbalanced fill must also be measured from the basement floor. 10. Prior to backfilling , foundation wall must be laterally supported by the floor construction at both the top and bottom or by adequate temporary bracing. 11. A foundation drainage system must be installed, consisting of a foundation drain complying with the Uniform Building Code Appendix 1825.3 & 4, or section 305.1 of The One and Two Family Dwelling Code, or other approved design. 12. Foundations must also comply with the applicable construction provisions of the Uniform Building Code chapter 19 and 21. UNIFORM BUILDING CODE CHAPTER 21 MASONRY UBC 2109 EMPIRICAL DESIGN
ONE AND TWO FAMILY DWELLING CODE
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and workers
