How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manufactured and modular homes

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

Monday, December 21, 2020

You lose a big discount—up to 35% off your windstorm insurance cost—if the inspector marks the box for Toe Nails on Section 4 - Roof To Wall Attachment of Florida's wind mitigation inspection form (Uniform Mitigation Verification Inspection Form, OIR-B1-1802). It does not necessarily mean that your roof has been toe-nailed to the wall below, although most pre-1960 houses are done that way. But it does indicate that the roof structure connection is inadequate by today’s standards. See our blog post What does toe-nailing mean? if you are not familiar with the term.

    When you have a wood roof structure like most homes, then it must meet the following four criteria for the discount:

  1. A metal connector clip or strap must be installed from the wall to every truss or rafter.
  2. The connector must be attached to the truss or rafter with a minimum of three nails.
  3. Less than 1/2” sideways gap between connection points.
  4. No visible severe corrosion of the connectors.

    The inspector must rate it based on the weakest connection. So if it doesn’t meet all these standards, even if only at one or two locations, the discount is voided and the inspector must mark the connection as equivalent to toe nailed.

    It is possible to do a retrofit and upgrade the connections to get the discount and there are contractors around Florida that specialize in it. The fix can be as simple as adding a third nail to each truss or rafter connection in the attic, or as complicated as having to remove the soffit all around the house and installing new connectors from outside, then replacing the soffit. The price can vary between $1,000 and $4,000-plus.

    Is the cost worth it? There are two factors to consider. The first is the number of years it will take for the insurance discount to pay back how much you spent, which may be more than a decade in some cases. But the second factor is the hurricane-resistance of your house. Upgrading the connection means you roof is much less likely to blow off or suffer severe damage in a hurricane, and what that additional level of safety for your home and your family is worth to you. 

    Although the maximum discount allowed for roof-to-wall connections is about 35%, it can be much less—depending on the insurance company and the other hurricane-resistant details of your home. So, if cost savings and payback time are your primary concern, check with your insurance agent first for the approximate dollar savings for the upgrade.

• • • • • • • • • • • • • • • • • • • • • • • • • • • •

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

How much does a wind mitigation inspection save on insurance?

 Who can perform a wind mitigation inspection in Florida?

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

• What is checked during a wind mitigation inspection? 

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)? 

• 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? 

     Visit our INSURANCE page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

Water Heaters

Water Heater Age

"What Are The

Signs Of..."

Septic Tank Systems

Structure and Rooms

Plumbing Pipes

Termites, Wood Rot

& Pests



When It First

Became Code

"Should I Buy A..."

Park Model Homes


Shingle Roofs




Wind Mitigation

Roof and Attic

"Does A Home


Pool and Spa

"What Is The Difference Between..."




Concrete and

Concrete Block

Metal Roofs


Modular Homes

Rain Gutters

Mold, Lead & Other Contaminants


Older and

Historic Houses

Crawl Spaces

Mobile-Manufactured Homes

Building Permits

Life Expectancy

Clay Soil





Exterior Walls

& Structures


Common Problems

HUD-Code for

Mobile Homes

Garages and Carports

Flat (Low Slope) Roofs

Electrical Panels

Sprinkler Systems

Electrical Receptacle Outlets

4-Point Inspections

Hurricane Resistance

Frequently Asked Questions (FAQ)

Home Inspection

Heating and Air Conditioning

Building Codes

Fireplaces and Chimneys

Inspector Licensing

& Standards

Energy Efficiency

Washers and Dryers



Doors and Windows



Electrical Wiring

Click Below  

for Links

to Collections

of Blog Posts

by Subject

Plumbing Drains

and Traps


Smoke & CO Alarms

Aging in Place

Top 5 results given instantly.

Click on magnifying glass

for all search results.






Air Conditioner & Furnace Age/Size


Electrical Switches





Water Intrusion

Electrical - Old

and Obsolete


Foundation Certifications

Tiny Houses

About McGarry and Madsen



Buying a home in North/Central Florida? Check our price for a  team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.

Moisture Problems

Crawl Spaces