How can I get a better wind mitigation report and reduce the cost of my windstorm insurance in Florida?

Wednesday, April 14, 2021

Here’s a breakdown of the seven categories in the Florida Wind Mitigation Form (OIR-B1-1802, Rev. 01/12) and how to get, or improve, your discount in each one:

1) Building Code - This discount is given for homes that were built after the first version of the state-wide Florida Building Code took effect in March 1, 2002. For homes in Miami-Dade and Broward counties only, the discount applies if the permit date is after September 1, 1994. You can’t really do anything to upgrade this one. Your home either was built after the FBC or Miami-Dade codes went into effect, or not. The exact date of the permit application must be entered on the form if it is near the year the new codes took effect. Only the date for the original construction of the home is used, and later permits for home additions or roof replacement do not change it.

2) Roof Covering - This concerns whether the roof covering material is approved by Florida Building Code or Miami-Dade County. Date of roof permit application of 3/1/02 or later; or original construction permit from 2004 or later can be used here, or markings on shingle of Miami-Dade approval. If any part of the roof does not qualify, you do not get this discount. For the HVHZ (High Velocity Hurricane Zone in South Florida), a permit application of 9/1/94 or later, or original construction permit of 1997 or later qualifies for the discount. Having a newer home or putting a new roof on your house will get you this discount.

3) Roof Deck Attachment - If your home was built after the Florida Build Code went into effect on 03/01/02, or your roof was replaced after 10/01/07, then your roof either had a stronger nailing pattern when constructed, or the nailing was Improved when the roof was replaced. The inspector has to document the nailing pattern as part of the report. Having a newer home or putting a new roof on your house will get you this discount.

4) Roof-To-Wall Attachment - There are several levels in this rating. If the roof is older and only nails were used as a connection (toe-nailed), you get no discount here. Also, if the house has metal clips or straps, but they are not nailed to the trusses or rafters with three or more nails, you lose this discount. Older houses that don’t meet the connection standard can often be retrofitted with metal fasteners or additional nails added to the fasteners—but this work can get expensive.

5) Roof Geometry - Because a hip roof (one that slopes inward on all sides) is more hurricane-resistant that other shapes—like a a gable, flat, or shed roof—it gets a good discount. You can’t really do anything to change the shape of your roof, but you can recognize when house-hunting that a hip roof will save you money on insurance. At least 90% of the roof, as measured at the fascia line—must be a hip to get this discount.

6) Secondary Water Resistance (SWR) - This discount is given for a self-adhering bituminous roofing membrane installed instead of a roofing felt as a base for the roof; or, it can be installed in strips over all the plywood joints, with a regular underlayment over it. The membrane does not require nails to hold it down, and is self-healing of small punctures. A popular brand is Grace Ice & Water Shield®. You need to request an SWR membrane when your roof is replaced to get this discount. Some homeowners confuse the new synthetic roofing underlayments, such as RhinoRoof®, for secondary water resistance—but they do not qualify for this discount. 

7) Opening Protection - We do not inspect for this discount very often in North Florida, because the area is not in a wind-borne debris hurricane zone like South Florida. It requires careful documentation by the inspector of any stickers, imprints, or etched markings that specify product approvals for impact-rated windows, doors, or shutters around the home exterior. Impact-rated fenestration is mandatory in South Florida, but only high-wind-resistant windows are required further north in the state and they do not receive a discount. You need to replace windows, doors, and skylights—essentially all openings, or protect them with shutters to get his discount. Also, product approval paperwork from the installer can be used to verification if markings on the product are no longer legible. Again, because the weakest area must be used, if only one opening is not protected, the whole discount is voided. 

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Here’s links to a collection of our blog posts about the WIND MITIGATION FORM:

 Who can perform a wind mitigation inspection in Florida?

• How long does it take for a wind mitigation inspection? 

Is a wind mitigation inspection transferable from previous homeowner to new homeowner?

Is a wind mitigation inspection report (OIR-B1-1802) required for homeowners insurance in Florida? 

Which building permit date is used for the Building Code section of the wind mitigation form? 

What are the different roof deck attachment discount categories for a wind mitigation inspection?

What determines the year of a house? 

What is the difference between a toe nail, clip, single wrap, and double wrap for the wind mitigation form?

How do I get the hip roof discount for my homeowners windstorm insurance?

Can I do my own wind mitigation inspection?   

What’s the difference between a gable and hip roof for my insurance? 

• What is the wind mitigation inspection for homeowner's insurance? 

• Why did I get no discounts or only a small discount from my wind mitigation inspection? 

How can I tell how hurricane resistant a Florida house is before I buy it?

• How long does a wind mitigation inspection remain valid? 

What is a wind mitigation discount? 

Do I get a a discount for partial hurricane shutters in a Wind Mitigation inspection?

• Why did I get no discount for roof-to-wall-attachment in my Wind Mitigation report? 

 What’s the difference between a four-point and wind mitigation inspection?

• What is the discount for Secondary Water Resistance (SWR) on a Wind Mitigation Inspection Report (OIR-B1-1802)? 

How much does a wind mitigation inspection save on insurance?

• What is the discount for gable end bracing in a Wind Mitigation Inspection (OIR-B1-1802)? 

What is the discount for wall construction type in a Wind Mitigation Inspection Report (OIR-B1-1802)?

• Does RhinoRoof® underlayment qualify to the Secondary Water Resistance (SWR) discount on a Florida Wind Mitigation (OIR-B1-1802) inspection? 

Can I get the Florida Building Code (FBC) discount on a wind mitigation form even if the permit application was before March 1, 2002?

• What is the difference between the HVHZ (High Velocity Hurricane Zone) and the Wind-Borne Debris Region in Florida Building Code? 

If the strap has 2 nails at my roof trusses, what credit do I get on my wind mitigation inspection?

• Is a digital signature acceptable for customers on the Florida Wind Mitigation Form (OIR-B1-1802)? 

• Can I get a wind mitigation inspection for a mobile home? 

Can I get a wind mitigation inspection for a modular home?

• Why didn't I get the hip roof discount on my wind mitigation inspection? 

What does toe nailing mean?

• Is it worth it to upgrade my roof tie-down hurricane straps for a better wind mitigation insurance discount? 

Why didn’t I get an insurance discount for my new hurricane-resistant windows on my wind mitigation inspection?

• When did Florida start requiring re-nailing of roof deck sheathing for a roof replacement?




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