What does roof deck attachment mean on a wind mitigation inspection?

Roof deck attachment refers to how the roof decking is fastened to the trusses or rafters. Inspectors document nail size, nail spacing, and whether the fasteners meet Florida Building Code requirements for uplift resistance.

How do inspectors determine the roof deck attachment rating?

Inspectors examine the attic for nail size, nail type, and spacing. Common ratings include 6d nails, 8d nails, and enhanced attachment patterns. The rating is based on the weakest attachment observed.

Do 8d nails provide better wind mitigation credits than 6d nails?

Yes. 8d nails typically provide stronger uplift resistance and qualify for higher wind mitigation credits. Homes with 6d nails may receive lower credits unless spacing or attachment patterns meet enhanced standards.

Does the spacing of nails affect wind mitigation discounts?

Yes. Nail spacing directly affects uplift resistance. Closer spacing generally results in stronger attachment and higher wind mitigation credits. Inspectors document spacing as part of the roof deck attachment rating.

What documentation helps confirm roof deck attachment compliance?

Useful documentation includes roofing permits, attic photos showing nail size and spacing, contractor installation records, and any documentation showing compliance with Florida Building Code uplift requirements.

Florida Roof Deck Attachment Wind Mitigation Guide

Roof deck attachment is one of the key wind mitigation credits on the Florida inspection form.

How Roof Deck Attachment Is Graded on the Wind Mitigation Form

Inspectors use specific options (A–H) on the OIR‑B1‑1802 form to identify how the roof decking is fastened to the trusses or rafters. These options translate directly into wind mitigation credits and can impact your premium.

Roof Deck Attachment Options (Florida OIR‑B1‑1802)

Option A – Weakest qualifying system:
7/16″ plywood or OSB attached with staples or 6d nails at 6″ edge / 12″ field, or any fastening system with an equivalent uplift resistance of at least 55 psf but less than the requirements of Options B or C.
(Matches: “staples or 6d nails… equivalent mean ultimate uplift resistance of at least 55 psf”)
Option B – Standard 8d nailing:
7/16″ plywood or OSB attached with 8d common nails at a maximum of 12″ spacing in the field (max 24″ truss/rafter spacing), or equivalent systems with uplift resistance of at least 103 psf.
(Matches: “8d common nails… equivalent… at least 103 psf”)
Option C – Strong 8d nailing / dimensional decking:
7/16″ plywood or OSB attached with 8d common nails at a maximum of 6″ spacing in the field, or dimensional lumber/T&G decking with proper nailing, or equivalent systems with uplift resistance of at least 182 psf.
(Matches: “8d common nails… 6\” in the field… uplift resistance of at least 182 psf”)
Option D – Reinforced concrete roof deck.
Option E – Spray foam products:
Spray foam installed along rafter/deck intersections and panel joints with uplift resistance of 110 psf (FOS 1.5).
(Matches: “Spray foam… uplift resistance of 110 PSF (FOS 1.5)”)
Option F – Other:
Any system that does not fit A–E but has documented characteristics.
Option G – Unknown or unidentified.
Option H – No attic access.

Which Roof Deck Attachment Is Weakest?

On the Florida wind mitigation form, Option A is the weakest qualifying roof deck attachment. It uses staples or smaller 6d nails and has lower uplift resistance compared to Options B and C. Homes with Option A typically receive less favorable credits than homes with stronger attachment (Options B, C, or D).

Why Stronger Roof Deck Attachment Helps Your Premium

Moving from Option A to B or C can improve your wind mitigation credits because carriers see better resistance to uplift and roof failure. During a re‑roof, upgrading the roof deck attachment can lead to stronger discounts once a new wind mitigation inspection is completed.

If you have a wind mitigation report and want to know how your roof deck attachment affects your premium, I can review the form and apply all eligible credits across multiple Florida carriers.

Wind Mitigation Knowledge Center

Explore detailed guides for each wind mitigation feature:

For personalized quotes with all eligible wind mitigation credits applied, visit our
Florida Homeowners Insurance Quote Page.

Disclaimer: This guide reflects my interpretation of the Florida wind mitigation inspection form for the purpose of applying insurance credits. It is not a substitute for a licensed inspection. If you need clarification on any construction feature, material, or compliance item, please consult a licensed Florida home inspector or contractor.

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