Mobile Home Tie-Down Calculator
Tie-Down Requirements by Wind Zone
Minimum requirements per HUD standards for a single-wide 14' × 56' home.
| Requirement | Zone I (70 mph) | Zone II (100 mph) | Zone III (110 mph) |
|---|---|---|---|
| Frame Tie Spacing | 8' max | 6' max | 4' max |
| Frame Ties/Side | 7 | 10 | 14 |
| Over-Top Ties | 7 | 10 | 14 |
| Min Anchor Capacity | 4,725 lbs | 4,725 lbs | 4,725 lbs |
| Strap Rating | 4,725 lbs | 4,725 lbs | 4,725 lbs |
| Ground Anchor Type | Auger/Screw | Auger/Concrete | Concrete required |
| Inspection Required | Varies by state | Yes | Yes |
How We Calculate This
This mobile home tie-down calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
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Mobile/manufactured homes must be anchored to resist wind uplift, overturning, and sliding per HUD standards (24 CFR 3280). The number and type of tie-downs depends on home dimensions, wind zone, and installation site.
The basic rule:
- Frame ties resist lateral/sliding forces — installed on both sides of the frame along the length
- Over-the-top ties resist uplift — run over the roof from ground anchor to ground anchor
- Wind Zone I: ties spaced no more than 8 feet apart. Zone II/III: spacing decreases to 4-6 feet
- Each anchor must have minimum 4,725 lbs holding capacity (higher in Zone II/III)
These are minimum HUD requirements. Local jurisdictions may have stricter requirements, especially in hurricane and tornado-prone areas. Always verify with your local building authority and hire a licensed installer.
When Would You Use This Calculator?
This mobile home tie-down calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
How many tie-downs does a single-wide mobile home need?
A typical 14'×56' single-wide in Wind Zone I needs about 7 frame ties per side (14 total) and 7 over-the-top ties, plus anchors for each. Wind Zone II/III requires more ties at closer spacing.
What is my HUD wind zone?
Wind Zone I covers most inland US areas (70 mph design wind). Zone II covers the Gulf Coast, southern Atlantic coast, and parts of the Great Plains (100 mph). Zone III covers extreme wind areas in southern Florida and coastal Gulf (110 mph).
What types of anchors are used?
Common types include auger/screw anchors (most common, driven into soil), concrete deadman anchors, and concrete slab anchors. The type depends on soil conditions. All must be rated for minimum holding capacity.
Do double-wide homes need more tie-downs?
Each section of a double-wide is anchored separately. A double-wide has more total anchors because each section needs frame ties and over-the-top ties. The mating wall side still needs frame ties.
Are tie-downs required by law?
Yes. Federal HUD standards require tie-downs for all manufactured homes. Most states have adopted these standards and some have additional requirements. Insurance companies also typically require proper anchoring.