ASCE 7-22 Roof Compliance

Roof Recover vs Replacement: When Wind Upgrades Trigger

In Broward County's 170 MPH wind zone, a simple roof recover can trigger mandatory compliance with current ASCE 7-22 wind load requirements. Cross the 25% threshold and your "recover" becomes a full structural upgrade project. Know where that line is before you commit to a roofing scope.

Calculate Roof Wind Loads Understand the Triggers

The Data Story: Recover vs Replacement Costs

How upgrade costs change when you cross the 25% threshold in Broward County

Recover with Upgrades

Full Replacement

Code Trigger Point

Below 25%: Simple Recover

Repairs under 25% of roof area can often proceed without wind load upgrades. Simple recover over existing layer with minimal structural work. Cost tracks linearly with area repaired.

At 25%: The Cliff

Crossing 25% triggers FBC Section 706.1.1. Suddenly, the entire roof must meet ASCE 7-22 requirements for Broward's 170 MPH zone. Costs jump dramatically as structural upgrades become mandatory.

Above 25%: Full Replacement Wins

Once triggered, recover costs parallel replacement costs. But replacement provides insurance benefits, clean warranty, and no moisture trapping. The cost differential narrows significantly.

What Triggers Full Wind Compliance?

Understanding when a roof project requires ASCE 7-22 upgrades in Broward County

Triggers Full Compliance

Repairs exceeding 25% of roof area in 12 months
Adding a second layer over non-compliant deck
Structural modifications to roof framing
Any work in Zone 3 (corners) requiring permits
Hurricane damage repairs over 25%
Change of occupancy or risk category
Building additions that affect roof loading

May Avoid Full Compliance

Repairs under 25% of total roof area
Emergency repairs (temporary, documented)
Cosmetic repairs not affecting structure
Coating applications over compliant deck
Flashing and sealant maintenance
Gutter and edge metal replacement in-kind
Single shingle replacements (storm damage)

Recover vs Replacement: True Cost Analysis

When the 25% threshold is crossed, here's how the numbers compare for a 2,000 SF roof

When Threshold is Triggered

Recover + Upgrades

New roofing material $6,000
Deck re-nailing (entire roof) $3,200
Hurricane strap upgrades $2,800
Secondary water barrier $1,600
Edge metal upgrades $1,200
Permit and engineering $1,500

Total $16,300

Clean Slate Option

Full Replacement

Tear-off and disposal $2,000
New roofing material $6,000
Deck re-nailing (compliant) $3,200
Hurricane strap upgrades $2,800
Secondary water barrier $1,600
Edge metal (new rated) $1,400
Permit and engineering $1,500

Total $18,500

The $2,200 Difference Delivers Significant Value

Full replacement provides: clean warranty coverage, no moisture trapping between layers, insurance premium discounts (often $500-1,500/year), and complete documentation of code compliance. Most homeowners recover the cost difference within 2-3 years through insurance savings alone.

Existing Roof Evaluation Checklist

What to assess before deciding between recover and replacement in Broward's 170 MPH zone

Deck Fastening Assessment

Identify existing nail type (smooth, ring-shank, screw)
Measure nail spacing at edges (required: 6" OC)
Measure nail spacing in field (required: 6" OC for 170 MPH)
Check for staple-only attachment (requires upgrade)
Document deck thickness (minimum 7/16" OSB or 15/32" plywood)

Rafter-to-Wall Connections

Identify existing connection type (toenails, clips, straps)
Document uplift capacity of existing hardware
Check for continuous load path to foundation
Verify blocking at gable ends exists
Assess ridge connection method

Historical Documentation

Pull original building permit (construction date)
Review previous roofing permits in last 12 months
Check for wind mitigation inspection reports
Identify applicable code at time of construction
Document any unpermitted modifications

Roof Geometry Analysis

Calculate total roof area for threshold tracking
Map Zone 1, 2, and 3 areas per ASCE 7-22
Measure roof slope for pressure coefficients
Identify hip vs gable configuration
Document mean roof height for calculations

Code References: ASCE 7-22 and FBC

The specific code sections that govern roof recover requirements in Broward County

Florida Building Code

FBC Section 706.1.1 - Roof Repairs

When roof repairs, recovers, or replacements exceed 25% of the total roof area within any 12-month period, the work shall comply with the requirements of this code for new construction. The percentage shall be cumulative, considering all work performed in the preceding 12-month period.

FBC 706.1.1 (2023 Edition)
Referenced: ASCE 7-22 for wind loads

ASCE 7-22

Chapter 30 - Component and Cladding

ASCE 7-22 defines wind pressure requirements for roof components including deck fastening, edge metal, and roofing materials. For Broward County's 170 MPH basic wind speed, Risk Category II buildings, Zone 3 (corners) can see design pressures exceeding -120 psf uplift.

ASCE 7-22, Sections 30.3-30.6
GCp coefficients, Zones 1, 2, 3

Roof Recover Wind Requirements FAQs

Common questions about recover vs replacement in Broward County

What is the 25% roof area threshold for wind load upgrades in Broward County?

Under the Florida Building Code Section 706.1.1 and ASCE 7-22, if roof repairs, recovers, or replacements exceed 25% of the total roof area within any 12-month period, the entire roof system must comply with current wind load requirements. In Broward County, this means meeting the 170 MPH basic wind speed design requirements for component and cladding pressures, which can require significant structural upgrades to the roof deck, fastener spacing, and perimeter attachments.

Can I do a roof recover over existing shingles in Broward's 170 MPH wind zone?

A roof recover (installing new roofing over existing) is only permitted if the existing roof has only one layer of roofing material, the existing roof deck and fasteners meet current wind load requirements, and the combined system can achieve the required uplift resistance. In Broward County's 170 MPH zone, most pre-2002 roofs lack adequate deck fastening for a recover to be code-compliant. A structural evaluation of the existing roof is required before permitting.

How does ASCE 7-22 differ from ASCE 7-16 for roof wind loads in Broward?

ASCE 7-22 introduced several changes that affect Broward County roof designs. The standard increased the importance of roof zone calculations (Zones 1, 2, 3) and refined the GCp coefficients for component and cladding loads. For 170 MPH wind speeds, edge and corner zones now have more stringent uplift requirements. ASCE 7-22 also clarified the effective wind area calculations which can change fastener spacing requirements in hip and gable roofs.

What structural upgrades are typically required when a roof recover triggers wind compliance?

When a recover triggers full wind compliance in Broward County, typical upgrades include: re-nailing the roof deck to current standards (typically 8d ring-shank nails at 6 inches on center at edges), adding hurricane straps or clips to all rafter-to-wall connections, installing secondary water resistance under the roofing material, upgrading edge metal and drip edge to rated systems, and potentially adding blocking at gable ends. These upgrades often cost more than a full tear-off and replacement.

How do I evaluate an existing roof for wind load compliance before a recover?

Existing roof evaluation for wind compliance requires: identifying the original construction date and applicable code, inspecting deck fastener type, size, and spacing in multiple locations, verifying rafter-to-wall connection types and capacity, measuring roof geometry for zone calculations, checking for continuous load path from deck to foundation, and documenting any previous repairs or modifications. This evaluation typically requires a Florida-licensed contractor or engineer and should be documented in the permit application.

Is it cheaper to do a roof recover or full replacement in Broward's high wind zone?

In Broward County's 170 MPH zone, a full replacement is often more cost-effective than a recover that triggers wind upgrades. A recover that trips the 25% threshold requires the same structural upgrades as a replacement, but you still have the old roofing material adding weight and potentially trapping moisture. Most contractors estimate the upgrade costs at $3-8 per square foot, while tear-off adds only $1-2 per square foot. The full replacement also qualifies for insurance premium discounts and provides a clean slate for warranty coverage.