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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
Supervisor, Manufactured Structures

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.

1.

Wick - Marshfield Homes

 

 

Lindsay floor system

 

 

 

Perpendicular to joists. - Simpson A23 connector w/ 810d nails (2) per truss.

 

 

 

Parallel to joists. - 16d nails 3" oc rim to sill.

 

 

 

 

2.

Schult Homes Corporation

 

 

Perimeter Frame

 

 

 

 

 

Masonry or Concrete foundation

 

 

 

Perpendicular to joists - 16d nail 12" oc filler to sill plate and 3/8" x 2" lag bolt 4' oc.

 

 

 

Parallel to joists - same as perpendicular

 

 

 

 

 

 

 

Wood Foundation - 4' maximum backfill height - CABO One & Two Family Dwelling Code 1995

 

 

 

Perpendicular to joists - 5/16" x 2 ½" Bolt 8' oc. and 16d nail @ 16" oc.

 

 

 

Parallel to joists - same as perpendicular

 

 

 

 

3.

Dutch Housing, Inc.

 

 

Extended Frame - 48" oc

 

 

 

Perpendicular to joists - 3 #8 x 1 ½" screws from extended outrigger 4' oc. to sill plate.

 

 

 

Parallel to joists - installation instructions

 

 

 

 

 

 

4.

Redman Homes

 

 

Extended Frame - 48" oc

 

 

 

Perpendicular to joists - 3 #8 x 1 ½" screws from extended outrigger 4' oc. to sill plate.

 

 

 

Parallel to joists - installation instructions

 

 

 

 

 

 

5.

Fortune Homes

 

 

Extended Frame - 48"oc

 

 

 

Perpendicular to joists - 3 #8 x 1 ½" screws from extended outrigger 4' oc. to sill plate.

 

 

 

Parallel to joists - installation instructions

 

 

 

 

 

 

6.

Commander Homes

 

 

Extended Frame - 48" oc

 

 

 

Perpendicular to joists - 3 #8 x 1 ½" screws from extended outrigger 4' oc. to sill plate.

 

 

 

Parallel to joists - installation instructions

 

 

 

 

 

 

7.

Fall Creek Housing Corporation

 

 

13 Gauge squared outrigger - 48" oc

 

 

 

Perpendicular to joists - 3 #8 x 1 ½" screws from extended outrigger 4' oc. to sill plate.

 

 

 

Parallel to joists - installation instructions

 

 

 

 

 

 

8.

Friendship Homes of Minnesota

 

 

Joist resting directly on the foundation sill plate.

 

 

Main I Beams supported on cross I Beams.

 

 

 

Perpendicular to joists - 1- #10 x 4" wood screw 16 " oc.

 

 

 

Parallel to joists - main "I" Beam on pilaster see manufacturers' instructions for anchoring

 

 

Squared outrigger - 48" oc.

 

 

 

Perpendicular to joists - 4 # 8 X 1 ½" wood screws at each outrigger

 

 

 

Parallel to joists - See manufacturers' instructions for anchorage.

 

 

 

 

 

 

9.

Friendship Homes

 

 

Joist resting directly on the foundation sill plate.

 

 

Main I Beams supported on cross I Beams.

 

 

 

Perpendicular to joists - 1- #10 x 4" wood screw 16 " oc.

 

 

 

Parallel to joists - main "I" Beam on pilaster see manufacturers' instructions for anchoring

 

 

Squared outrigger - 48" oc.

 

 

 

Perpendicular to joists - 4 # 8 X 1 ½" wood screws at each outrigger 

 

 

Parallel to joists - See manufacturers instructions for anchorage.

 

 

 

 

 

 

10.

Century Homes

 

 

Joist resting directly on the foundation sill plate.

 

 

Main I Beams supported on cross I Beams.

 

 

 

Perpendicular to joists - 1- #10 x 4" wood screw 16 " oc.

 

 

 

Parallel to joists - main "I" Beam on pilaster see manufacturers' instructions for anchoring

 

 

Squared outrigger - 48" oc.

 

 

 

Perpendicular to joists - 4 # 8 X 1 ½" wood screws at each outrigger

 

 

 

Parallel to joists - See manufacturers' instructions for anchorage.

 

 

 

 

 

 

11.

Fairmont Homes

 

 

Joist resting directly on the foundation sill plate.

 

 

Main I Beams supported on cross I Beams.

 

 

 

Perpendicular to joists - 1- #10 x 4" wood screw 16 " oc.

 

 

 

 

 

Parallel to joists - main "I" Beam on pilaster see manufacturers' instructions for anchoring

 

 

Squared outrigger - 48" oc.

 

 

 

Perpendicular to joists - 4 # 8 X 1 ½" wood screws at each outrigger

 

 

 

Parallel to joists - See manufacturers' instructions for anchorage.

 

 

 

 

 

 

12.

Highland Manufacturing Inc.

 

 

Standard frame - joist bearing on the sill

 

 

 

Perpendicular to joists - 3/8" x 6" lag bolt 4' oc

 

 

 

Parallel to joists - See manufacturers' instructions.

 

 

 

 

 

 

13.

Skyline

 

 

Integral floor frame

 

 

 

Perpendicular to joist - factory attached outrigger to sill w/ 2 -#10 TEC Screws

 

 

 

 

 

Parallel to joists - See manufacturers' instructions.

 

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

  

                            

      

 

 

ADDITIONS TO

Manufactured Home

Information Bulletin Number 29

To:

Manufacturers, Manufactured Home Dealers, Installers, and Building Officials

From:

Elroy Berhahl
Supervisor, Manufactured Structures

Date:

January 3, 2000

Subject:    

Manufactured home attachment to foundation walls

The following manufacturers have submitted their method of attachment between the foundation wall and the manufactured home frame.  See "Manufactured Information Bulletin Number 29" for the basic content.  The information provided in this bulletin is only a recap of the manufacturers instructions, the manufacturers installation manuals are to be followed when installing and inspecting the home.

 

Liberty Homes

 

 

Standard manufactured home frame.

 

 

 

Use 3 - 8d nails through an oversized plate into each joist or 2 - #8 - 3" wood screws.

 

 

Perimeter frame

 

 

 

Use # 8 screw through the "I" beam or welded clip at 22" oc into sill plate.

 

 

 

 

 

Holly Park

 

 

Extended frame.

 

 

 

Use 2 11 gauge 2" steel brackets 4" max from outrigger secured 2/ 2 - #8 x  1 1/2" screws each leg.

 

 

 

 

 

Medallion

 

 

Standard manufactured home frame.

 

 

 

Use 2 - 12d nails 16" oc rim joist to sill.

 

 

Perimeter frame.

 

 

 

Use 1/2" bolts 4' -6" or 6' -0" oc from wall through the "I" beam.

 

   
    
               
                  

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