Short answer: The way your roof trusses attach to your exterior walls is one of the biggest factors on your wind mitigation inspection form — and one of the biggest levers on your homeowner’s insurance premium in South Florida. Toenails (old-school nails driven at an angle) earn little or no credit. Metal clips and wraps earn progressively more. If your home was built before the early 2000s, you likely still have toenails — and you are leaving money on the table every year.
Key Takeaways
- Roof-to-wall attachment type is scored on the OIR-B1-1802 wind mitigation form and directly affects your insurance premium.
- The credit hierarchy runs: toenails (lowest) → clips → single wraps → double wraps (highest).
- Every truss must have a connector; a maximum ½-inch sideways gap is allowed — otherwise the inspector downgrades the whole roof.
- Re-roofing does not automatically add hurricane straps — a separate structural retrofit is required.
- Strap retrofit work that involves structural framing requires a contractor authorized for structural scope — not a roofer alone.
- Retrofit cost varies widely based on attic access and truss count; get a site-specific estimate.
The Problem
Why Most Older Florida Homes Are Under-Protected — and Over-Charged
Your trusses may be connected by nothing more than three nails driven at an angle.
Thousands of homes in Miami-Dade, Broward, and Palm Beach were framed before modern hurricane-resistant connection standards existed. The original roof-to-wall connection method — driving nails diagonally through the truss into the top plate of the wall — is called a toenail. It works under normal loads. Under hurricane uplift, toenails are among the weakest connections a truss can have.
When a wind mitigation inspector visits your home and checks the OIR-B1-1802 form field for roof-to-wall attachment, a toenail finding yields the lowest possible credit category. That translates directly to higher annual insurance premiums — potentially hundreds of dollars more per year compared to a home with the same roof but proper metal straps, depending on your insurer and coverage amount.
The painful part: many homeowners replace their roof, pay a significant sum, and assume the straps were included. They were not. A new roof installation replaces shingles, underlayment, and decking — it does not automatically add hurricane straps to every truss. That is a separate structural scope item.
South Florida Context
The HVHZ, OIR-B1-1802, and Why the Inspector’s Checkmark Matters So Much Here
Florida’s High Velocity Hurricane Zone (HVHZ) covers Miami-Dade and Broward counties — the strictest building-code environment in the United States. Homes in this zone face mandatory wind mitigation inspections for insurance purposes, and insurers are required to apply credits based on the OIR-B1-1802 form results.
The roof-to-wall attachment field on that form has five categories, each tied to a different credit level:
| Connection Type | Inspector Code | Credit Level | Notes |
|---|---|---|---|
| Toenails only | A | Lowest / none | Pre-2002 common construction |
| Clips (single) | B | Moderate | Must be on every truss; max ½” gap |
| Single wraps | C | Higher | Wrap over top of truss; 3 nails minimum per side |
| Double wraps | D | Highest | Both sides wrapped; strongest connection; max credit |
| Structural or reinforced | E/F | Highest | Engineered or proprietary systems |
The three-nail rule is critical: an inspector will not give credit for a clip or strap unless it is fastened with at least three nails per connector. Two nails — even if a metal connector is present — drops the rating to the lower category. Similarly, if even one truss lacks a connector or exceeds the ½-inch lateral gap allowance, the entire roof can be downgraded on the form.
How It Works
Toenails, Clips, and Wraps: What the Inspector Is Actually Looking At
A wind mitigation inspector enters your attic (or reviews attic photos) and looks at each truss-to-top-plate junction. Here is what each connection type means structurally:
- Toenails: Two or three nails driven at roughly 45° through the truss into the wall’s top plate. No metal hardware. Resists modest downward loads; provides minimal uplift resistance.
- Clips (H-clips or similar): A stamped metal bracket nailed to the side of the truss and to the top plate. Resists uplift directly. Requires 3+ nails on each leg to count for full credit.
- Single wraps: A flat strap that wraps over the top of the truss and is nailed to both sides. More surface area than a clip; higher uplift rating.
- Double wraps: Two straps, one on each side of the truss, both wrapped over and nailed down. The strongest standard retrofit connection. Earns the highest OIR-B1-1802 credit.
One more rule that catches homeowners off guard: the standard requires that every truss in the roof system has a qualifying connector. If 90% of your trusses have double wraps but 10% still have toenails, the inspector must rate the roof at the lower category. There is no averaging.
Side-by-Side
Retrofit Options Compared: What Changes, What Costs, What Earns Credit
| Retrofit Option | Structural Scope | OIR Credit Potential | Typical Access Needed | Who Can Perform |
|---|---|---|---|---|
| Do nothing (toenails) | None | Lowest | — | — |
| Add clips at every truss | Low–moderate | Moderate | Open attic preferred | Contractor with structural authorization |
| Add single wraps | Moderate | Higher | Clear truss access required | Contractor with structural authorization |
| Add double wraps | Moderate–high | Highest standard credit | Full attic access both truss sides | Contractor with structural authorization |
Access is one of the biggest cost drivers. A home with a clean, open attic and standard 24-inch truss spacing is far simpler to retrofit than a home with spray-foam insulation covering the top plates, HVAC equipment blocking truss bays, or hip-roof geometry requiring custom-length straps at every corner.
When Staying with Toenails Is Reasonable
If your home is on the market short-term and the insurance delta does not justify the retrofit investment, or if your attic is entirely inaccessible without major demolition, a full strap retrofit may not pencil out. A qualified contractor can walk the attic and give you an honest assessment before you commit.
Why Structural Scope Requires the Right License
A Roofer Alone Cannot Always Close This Job
Hurricane strap retrofits involve structural framing — a licensed general contractor, not a roofer alone, is authorized to perform that work under Florida law.
“We see it all the time: a homeowner gets a new roof, pays for a wind mitigation inspection, and finds out the straps were never touched. Re-roofing and strap retrofit are two completely separate scopes. One of the reasons we hold a Certified General Contractor license is so we can handle both in a single project without handing you off to someone else.”
President, Bigfoot Windows & Roofing
Retrofit Materials
What Hardware Goes on Your Trusses — and Why It Matters
Not all metal connectors are equal. The connector must carry a current Florida Product Approval (FPA) number and must match the truss lumber dimension and spacing specified in the engineer’s retrofit design. Using the wrong gauge, the wrong nail pattern, or a connector whose approval has lapsed will result in a failed inspection — and require the work to be redone.
For standard wood-framed roof systems in South Florida, H-clips and wrap straps from manufacturers with active Florida Product Approvals are the baseline. For engineered truss systems or homes in the HVHZ with specific uplift requirements, an engineer of record may need to specify the connector model. That engineering layer is part of what a permit-pulled structural retrofit looks like — and it is part of what separates a properly documented job from one that costs money but earns no credit.
If your project also includes a full roof replacement, coordinating the strap retrofit at the same time is the most cost-efficient approach: the top plates are already accessible before new decking goes down, reducing labor significantly compared to a standalone attic retrofit after the fact.
The Process
How a Hurricane Strap Retrofit Actually Unfolds
- Attic assessment: A contractor walks your attic, documents every truss connection, measures lateral gaps, and identifies access constraints (HVAC, spray foam, low clearance).
- Engineering & permit: For most structural retrofits in Miami-Dade and Broward, a permit is required. An engineer may need to specify the connector and nail pattern. The permit documents the work for your insurance carrier.
- Installation: Connectors are installed at every truss, nailed to code (minimum 3 nails per leg for credit). Photos are taken at each truss for the inspection record.
- County inspection: A building inspector verifies the work before attic insulation or new decking is replaced.
- Wind mitigation re-inspection: After the permit closes, a licensed wind mitigation inspector re-inspects and issues an updated OIR-B1-1802 form with the new roof-to-wall attachment category.
- Insurance submission: You submit the updated form to your insurer (or have your agent do it). The new credit is applied at your next renewal or mid-term endorsement depending on carrier policy.
The permit step is not optional in most South Florida jurisdictions. An unpermitted strap retrofit will not be accepted by most insurers and creates a disclosure liability if you sell the home. If a contractor offers to skip the permit to save money, that is a red flag — not a deal.
Because this work spans roofing scope and structural framing scope, having a single contractor who holds both a Certified Roofing Contractor license and a Certified General Contractor license means one permit, one point of accountability, and no finger-pointing between trades if a detail needs coordination.
Want to know what your attic actually has?
Call Bigfoot Windows & Roofing for a site assessment. We hold both the roofing and structural licenses to complete the work — and pull the permit correctly.
Related Reading
More Guides for South Florida Homeowners
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Written by Darryl Henry Rosenbaum, Founder of Bigfoot Windows & Roofing.
Darryl Henry Rosenbaum, doing business as Bigfoot Windows and Roofing, holds four active Florida licenses recognized by the Florida Department of Business and Professional Regulation (DBPR): Certified General Contractor (CGC1531370), Certified Residential Contractor (CRC1331693), Certified Roofing Contractor (CCC1333168), and Certified Specialty Contractor with a Glass & Glazing Specialty (SCC131153098).
Who We’re Not the Right Fit For
- Homeowners who only need a permit expeditor: If you have already hired a contractor and just need someone to pull a permit, that is not a service we offer. We take on the full scope or refer you elsewhere.
- Projects requiring electrical, plumbing, or HVAC coordination as the primary scope: Our four licenses cover general contracting, residential contracting, roofing, and glass & glazing. We do not hold electrical or mechanical licenses and will not pretend to coordinate those trades as the lead contractor.
- Homeowners seeking the absolute lowest bid: Strap retrofits done correctly require permits, engineering when needed, and inspected connections at every truss. If a quote skips those steps, it is cheaper for a reason. We are not the right fit for buyers prioritizing price over a documented, insurer-accepted outcome.
- Very small single-strap repairs under warranty from another contractor: If a previous contractor’s work is under warranty and only one or two straps need attention, contact them first. We focus on full-system assessments and retrofits.
Homeowner Questions
Frequently Asked Questions
What are hurricane straps and what do they do?
Hurricane straps are metal connectors — clips or wrap-around straps — that mechanically fasten each roof truss to the exterior wall’s top plate. Their job is to resist uplift: the force a hurricane exerts trying to peel your roof off the walls. Without metal connectors, older toenail connections can pull free under sustained high-wind loads. Straps significantly increase the force required to separate the roof from the wall structure.
Do hurricane straps lower my Florida homeowner’s insurance?
Yes — upgrading your roof-to-wall attachment type earns a higher credit on the OIR-B1-1802 wind mitigation form, which insurers are required to apply to your premium. The exact dollar savings depends on your insurer, your coverage amount, and what category you move from and to. Moving from toenails to double wraps typically produces the largest single-item wind mitigation credit available on the form, per the OIR credit structure.
Does replacing my roof automatically add hurricane straps?
No. A standard roof replacement covers shingles, underlayment, and decking — it does not include a strap retrofit unless that scope is explicitly quoted and permitted separately. Many homeowners discover this after paying for a new roof and then having a wind mitigation inspection that still shows toenails. If you want straps added, ask your contractor to quote that scope as a distinct line item with its own permit.
What is the difference between toenails, clips, and straps on the wind mitigation form?
Toenails earn the lowest credit; clips, single wraps, and double wraps each earn progressively higher credits on the OIR-B1-1802 form. Toenails (Category A) use no metal hardware. Clips (Category B) are single-sided metal brackets. Single wraps (Category C) wrap over the truss top. Double wraps (Category D) wrap both sides and earn the highest standard credit. Each connector must be fastened with at least three nails per leg, and every truss must have one — partial coverage does not qualify for the higher category.
How much does it cost to retrofit hurricane straps in Florida?
Retrofit cost depends heavily on attic access, truss count, roof geometry, and whether engineering is required. Open attics with clear truss access cost significantly less to retrofit than attics blocked by spray foam, HVAC equipment, or low clearance. There is no single price that applies to all homes. A site-specific attic assessment is the only reliable way to get an accurate number. Get at least two itemized quotes that include the permit and inspection.
Do I need a general contractor to install hurricane straps?
Ready to get started? Get a free, no-pressure estimate from a licensed South Florida contractor.