The purpose of this page is to define a manufactured (mobile) home, a commonly used term in floodplain management.
A structure, transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when attached to the required utilities. The term manufactured home does not include a recreational vehicle. Generally, manufactured homes must meet the same requirements as stick built or conventional housing. Because they are usually residential buildings, they must be elevated so that the lowest floor is above the Base Flood Elevation (BFE).
Manufactured homes must be elevated and anchored to to a permanent foundation to resist flotation, collapse, or lateral movement.
- (a) (1) - Development Permit
- (a) (3) - Reasonably Safe From Flooding
- (b) (8) - Anchoring Requirement
- (c) (6) - Outside of Manufactured Home Park, New or Expansion of Existing Manufactured Home Park, and Substantially Damaged Manufactured Homes
- (c) (12) - Within Existing Manufactured Home Park
- (e) (8) - Zone V
- IS-9 Managing Floodplain Development Through The National Flood Insurance Program (NFIP) (Pages 5-42 and 5-44)
- Protecting Manufactured Homes from Floods and Other Hazards (FEMA P-85)
Special Topic Resources
- Page 5-44
Supplemental Information for Manufactured (Mobile) Home
All manufactured homes placed in Special Flood Hazard Areas (SFHAs) have to be elevated to or above the BFE, except those being placed in an existing manufactured home park or subdivision. Manufactured homes placed on a site in an existing manufactured home park or subdivision must be elevated on at least 3-foot reinforced piers or equivalent foundations, or to or above the BFE if that is lower. If a manufactured home had previously been substantially damaged on a specific site, new placements on that sitemust be elevated to or above the BFE. has had substantial damage to a home.
Anchoring systems are a critical component of a manufactured home installation. Anchoring systems generally consist of ties (straps) and anchors. The ties are generally of two types: over-the-top ties and frame ties which connect the I-beam to the anchor.
Ties are secured to either a ground anchor, which may be a screw auger or concrete deadman anchor, or to a slab anchor, or to the foundation itself.
Anchors must be sufficiently embedded to account for saturated soil conditions which accompany flooding.
To anchor a manufactured home to a pier foundation, frame ties connect the I-beams to an anchor set into the ground below the home. For posts or piles, the I-beams can be anchored directly to the horizontal beam of the foundation.