Per Chapter 1 - General Information of the Permanent Foundations Guide for Manufactured Housing--Page 1-1, C. Definition of permanent Foundation. Permanent foundations must be constructed of
durable materials; (
for example) concrete, mortared masonry, or treated wood - and be site built. It shall have attachment points to an anchor and stabilize the manufactured home to transfer all loads, herein defined, to the underlying soil or rock. The permanent foundations shall be structurally developed in accordance with this document or be structurally designed by a licensed professional engineer for the following: 1. Vertical stability--- 2. Lateral stability------.
Exterior Foundation Wall: Foundations placed directly below the exterior perimeter walls of the unit. These walls may, or may not be structurally used as bearing walls under horizontal loads. If these walls are not used structurally they are called non-bearing skirt walls.
Foundation Types:
Type C: Foundation system supported and anchored at chassis only, to equally spaced piers.
Type E: Foundation system supported at chassis and exterior wall but anchored for uplift and overturning at exterior wall only
Type I: Foundation system supported at chassis and exterior wall but anchored for uplift and overturning at exterior piers only.
National Homeownership Center Reference Guide:
Manufactured Homes:
Foundation Compliance
Chapter 1
Appraisal and Property Requirements
Page 1-09d
1. All foundation systems, new and existing, must meet the guidelines published in the Permanent Foundations Guide for Manufactured Housing, dated September 1996 (For a copy, see Mortgagee Letter 97-36).
A certification attesting to compliance with this handbook must be obtained from a licensed professional engineer and included in the insuring file. This procedure does not apply when the current FHA borrower refinances their loan. It is applicable for all resales.
2. HUD Handbook 4145.1, Rev-2, Section 3-4. C. Criteria for Existing Properties, dated Feb. 1990 states: "The foundation design information in HUD Handbook 4930.3, Permanent Foundations Guide for Manufactured Housing, Appendices A,B and C, may be used to verify the design of the existing system. Provide a licensed professional engineer’s certification to verify compliance with the handbook guidelines and with the requirements set forth in paragraph 3-4.B." HUD Handbook 4930.3 was republished in the Permanent Foundations Guide for Manufactured Housing.
3. Permanent Foundations Guide for Manufactured Housing (PFGMH). This guide as well as software can be ordered by calling (800) 245-2691 or from the web at
http://www.huduser.org