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How is the size and spacing of foundation piers under a mobile/manufactured home determined in Florida?
Thursday, June 14, 2018
Pier Size and Spacing Determined By Manufacturer’s Manual or Florida Rule 15C-1
Mobile homes can only be set by a licensed installer in Florida. For new homes, the installer must follow the instructions in the manufacturer’s installation manual, except where they are superseded by Rule 15C-1 of the Florida AdminIstrative Code. Used homes are also installed per manufacturer’s manual; however, if it is not available, the installer follows the guidelines and load/spacing tables in Rule 15C-1.
Examples of Rule 15C-1 Overrides
There are multiple installation requirements in Florida’s Rule 15C-1 that exceed the HUD standards. Here’s a few of them:
- Wood foundations not allowed.
- Piers required at each end of centerline of home, even if the manufacturer’s installation manual does not require them.
- Steel piers not allowed.
- Smallest foundation pad allowed is 16” x 16”.
- Minimum acceptable soil bearing capacity is 1500 psf, which cannot be declared without a pocket penetrometer test.
All of these foundation pier rules are designed to avoid having a pier failure like the one shown below.
For a listing of typical foundation and tie-down requirements and defects, see our blog post What are the most common defects in mobile/manufactured home foundation piers? and What are the tie-down requirements for a mobile home?
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