How a Wind Mitigation Inspection Affects Your Florida Insurance Premium

Your homeowners insurance bill in Florida can feel like a second mortgage, especially after the market upheaval of recent years. What most Altamonte Springs homeowners don't realize is that a single document — a wind mitigation inspection report — can meaningfully reduce that premium, sometimes by hundreds of dollars a year. Insurers are required by Florida law to offer credits for wind-resistant features, and those credits stack.

Understanding what an inspector actually looks for, and how each finding translates to real savings, puts you in control. Here's a plain-English walkthrough of every section of the form and what you can do to improve your result before the next inspection.

What Is a Wind Mitigation Inspection?

A wind mitigation inspection is a formal evaluation of the features of your home that help it resist hurricane-force wind. A licensed inspector — typically a certified home inspector, engineer, or contractor — fills out a standardized state form called the OIR-B1-1802. Insurance companies use this form to calculate how much of a premium discount they can offer you.

The inspection covers your roof from the inside and outside. It usually takes one to two hours and costs far less than even one year's worth of premium savings. Most insurers accept a report for up to five years before requiring a renewal.

If you're not sure whether your current report is up to date, a free inspection arranged through Rune Roofing can help you find out.

The Eight Sections of the OIR-B1-1802 Form

1. Building Code (Year the Roof Was Permitted)

The form first asks when the roof was permitted. Homes permitted after the 2001 Florida Building Code adoption — and especially after the 2007 High-Velocity Hurricane Zone updates — tend to receive better baseline credits because the code required stronger construction methods. If your roof is aging, a roof replacement permitted to current code standards can reset this section in your favor.

Typical premium impact: Modest on its own, but it unlocks better credits in other sections.

2. Roof Covering

What material covers your roof matters. A properly installed asphalt shingle, metal panel, or tile system that meets current Florida Product Approval standards earns a credit. The inspector will look for a Florida Product Approval number on the materials or in your permit records.

Typical premium impact: Low to moderate discount on its own; mainly confirms eligibility for other credits.

3. Roof Deck Attachment

This is one of the highest-value sections. The inspector goes into your attic and measures the nail length and spacing used to attach the plywood or OSB decking to the roof trusses or rafters. The scale runs roughly like this:

• 6d nails spaced at 6 inches or more (old standard): Minimal credit or none
• 8d nails at 6-inch spacing: Moderate credit
• 8d nails at 6-inch spacing with ring-shank nails: Better credit
• 8d ring-shank nails at 4-inch spacing: Maximum credit in this category

Typical premium impact: This single item can be responsible for a 15–30% discount, depending on your insurer and zone. It is the single most impactful item on the form for many homeowners.

If your decking was nailed to old standards, re-nailing the deck during a full roof replacement is the most cost-effective way to earn this credit.

4. Roof-to-Wall Attachment

How your roof structure connects to your walls determines how well the roof stays on during a major storm. The inspector looks at your truss or rafter connections from inside the attic. The hierarchy from weakest to strongest is:

• Toe nails (nails driven at an angle — lowest credit)
• Clips (single metal strap wrapping one side)
• Single wraps
• Double wraps
• Structural anchors (hurricane straps wrapping fully around)

Typical premium impact: Double wraps and structural anchors can produce some of the largest individual discounts on the form — often 20–45% depending on your wind zone and insurer. This is frequently the most expensive feature to upgrade if you don't have it, but the insurance savings often justify the cost over time.

5. Roof Geometry

The shape of your roof affects how wind moves over and around it. Options range from flat (lowest credit) to hip roof (all four sides slope downward, no vertical gable ends). A full hip roof is the most wind-resistant shape and earns the highest credit.

Typical premium impact: A qualifying hip roof can earn a 20–40% discount in this section. Gable ends with knee walls or bracing provide partial credit. Changing your roof geometry is a major structural project, but if you're doing a full replacement or addition, it's worth discussing with the roofers your contractor connects you with.

6. Secondary Water Resistance (SWR)

This line item asks whether a self-adhering modified bitumen underlayment — often called peel-and-stick — was installed beneath the roof covering. This layer keeps water out if the outer surface is damaged in a storm. It's sometimes called a "secondary water barrier."

Typical premium impact: SWR earns a solid credit, commonly in the 5–15% range. When licensed roofers perform a replacement, requesting this underlayment is a straightforward upgrade that pays back quickly. Ask your matched contractor about it during any roof replacement estimate.

7. Opening Protection

This section evaluates how well your windows, doors, and skylights resist wind-borne debris. The categories are:

• No protection: No credit
• Basic (plywood panels): Minimal credit
• Hurricane fabric or screen systems: Moderate credit
• Impact-resistant glass or rated panel systems: Maximum credit

Typical premium impact: Full opening protection with rated products can reduce premiums by 45% or more on its own in high-wind zones. This is a whole-home upgrade, not a roofing item, but it's the highest single lever available on the entire form.

8. Terrain / Exposure Category

The inspector will note the wind exposure category of your lot based on surrounding terrain. Open water-front lots face higher sustained wind speeds than lots sheltered by trees or other structures. You can't change your terrain, but knowing your category helps you prioritize which upgrades matter most.

How to Improve Your Score Before the Next Inspection

1. Pull your existing report. Review each section and note where you received partial or no credit.

2. Focus on deck attachment first. It's the most cost-effective upgrade and is done during any re-roof.

3. Ask about peel-and-stick underlayment. Most licensed roofers offer it; confirm it will be documented for the inspector.

4. Get your hurricane straps evaluated. A contractor can often add or upgrade clips and wraps during a re-roof without major structural work.

5. Plan opening protection in phases. Start with the most exposed openings — garage doors and large windows — which have the highest impact on the credit.

6. Schedule a new inspection after upgrades. Credits only apply after a new report is submitted to your insurer.

After storm damage, insurers sometimes require a fresh inspection anyway, making it the perfect moment to ensure all upgrades are documented.

Your Next Step

A wind mitigation report is one of the few documents that can genuinely lower your Florida insurance costs for years. If your report is outdated, missing, or you've made improvements since your last inspection, call us today. Rune Roofing will connect you with a licensed local roofer in Altamonte Springs who can walk your roof, identify upgrade opportunities, and help you get a new inspection scheduled — at no cost for the initial visit. You can also read more guides on protecting your home and your wallet in Florida's challenging insurance environment.