Preface Manufacturer-Supplied Information
This Handbook is a guide for those ap- Information about the home must be pro-
proving manufactured homes on permanent vided by the manufacturer. To simplify the ap-
foundations -- HUD Field Offices involved in proval process, the manufacturer may wish to
the approval process and manufacturers and prepare a Manufacturer's Worksheet for each
site owners who are seeking approval. standard foundation system. The Manufactur-
er's Worksheet is in Appendix E.
There are two acceptable methods for
owners or developers to use in seeking HUD
Approval: (1) Furnish foundation drawings and
design calculations prepared and sealed by a Information about the building site must
licensed professional for foundation concepts be provided by the owner. The size of the
shown in Appendix A and other foundation foundation, the depth of the footings, and the
concepts not covered in the Handbook. The anchorage requirements depends on the build-
design criteria and requirements of Chapters ing's site. This information should be submit-
1-7 of the Handbook shall be followed in ted on the Owner’s Site Acceptance Worksheet
Method (1) and does not require the submittal (Appendix E).
of Appendix F (Appendix F instructions in par-
agraph 103 do not apply to Method 1.) Or (2) Handbook: Site Conditions
Furnish the Design Worksheet (Appendix F)
prepared by a licensed professional in accord- Chapters 2 and 3 of the Handbook con-
ance with the Handbook. Method (2) does not tain recommendations for site preparation.
require design calculations. Methods (1) & (2) They also point out unusual site conditions that
both require submittals of Appendix E. See Ta- may call for additional geotechnical engineer-
ble i - 1 on page ii. ing reports, such as sloping sites and problem
soils. This documentation must also be submit-
The Foundation Concepts (Appendix A) ted if problem sites are found.
are considered permanent foundations. Perma-
nent foundations are those that have been engi-
Handbook: Foundation Design Concepts
neered for safety and long-term satisfactory
performance. These foundations were also de- Companies building manufactured homes
signed specifically for use with manufactured have assisted in the preparation of this hand-
homes. The Handbook contains construction book by providing foundation design concepts
recommendations that assure the home, the appropriate for manufactured housing. This
foundation and the site are all compatible. Be- information was assembled and used as the ba-
cause these recommendations are based on es- sis for the Foundation Design Concepts in Ap-
timated conditions, it is important to have pendix A.
complete information for each manufactured
home and its site.
The Handbook provides information ries of logical steps designated to lead to ap-
about three basic foundation types and six al- proval. The HUD Field Office at their preroga-
ternative types. Appendix A shows which tive may review the Design Worksheet.
foundation designs can be used on sites with
special requirements, such as windy sites. Technical assistance to determine accept-
ability of individual designs of permanent
foundation systems should be obtained from a
Handbook: Design Verification
licensed professional engineer.
The Handbook's format is arranged for a
licensed professional to progress through a se-
TITLE Method (1) Method (2)
Foundation Drawings (Pre- Yes No
pared & Sealed by Licensed
Design Calculations (Pre- Yes No
pared & Sealed by Licensed
Design Criteria Chap- Yes Yes
Appendix A - Foundation Yes Yes
Other Foundation Concepts Yes No
Appendix E (Own- Yes Yes
er’s Site Acceptability & Manu-
Appendix F De- No Yes
sign Worksheet (Prepared
& Sealed by Licensed Profes-
Table i - 1