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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new homes, the installer must follow the instructions in the manufacturer’s installation manual, except where they are superseded by Rule 15C-1 of the Florida AdminIstrative Code.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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Here’s links to a collection of our blog posts about MOBILE/MANUFACTURED HOMES:
• Does the building code apply to mobile homes?
• Where can I file a complaint if I have problems with my new or used manufactured/mobile home in Florida?
• How do I determine the age of a very old mobile home?
• What is a "HUD label verification letter" for a mobile/manufactured home?
• When did a ground cover vapor barrier (plastic sheet) become required under a mobile/manufactured home?
• Is it safe to go under a mobile home?
• Are older mobile homes unsafe?
• What do I need to know about buying a foreclosed mobile home?
• Does it make sense to buy an older mobile home and remodel it?
• Where do I find the vehicle identification number (VIN) on a mobile home?
• How do I find out how old a mobile home is and who manufactured it?
• What is the right price for a used mobile home?
• How energy efficient is a mobile home?
• When were the first double-wide mobile homes manufactured?
• How do I upgrade my old (pre-1976) mobile home to meet HUD standards?
• What size air conditioner is right for my mobile home?
• Can you move an older mobile home in Florida?
• What does the HUD tag look like and where do I find it on a mobile home?
• Can I put a mobile home in my backyard in Florida?
• How can I remove water under my mobile home?
• What's the differences between a trailer, a mobile home, a manufactured home, and a modular home?
• What is a D-sticker mobile home?
• What are the tie-down requirements for a mobile home?
• How fireproof is a mobile home?
• Can I install a mobile home myself?
• What is a Park Model mobile home?
• Does an addition to a mobile home have to comply with the HUD Code?
• What walls can I remove in a mobile home?
• What can I do to prevent dampness and mold in my mobile home?
• How can I tell if a mobile home is well constructed?
• How can I tell the difference between a manufactured home and a modular home?
Visit our MOBILE/MANUFACTURED HOMES page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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