Free Houston Tool
Hurricane Roof Wind-Load & TDI/WPI-8 Estimator
On the Texas Gulf Coast, your roof's required wind rating — and whether you need a TDI WPI-8 Certificate of Compliance for windstorm insurance — depends on exactly where you live. This estimator maps your Houston sub-region to its design wind speed and tells you what documentation a hurricane claim will demand.
Estimated design wind speed for your zone
Outside the TDI catastrophe area, so a WPI-8 is generally not mandated — but Houston still sees hurricane-force gusts (Beryl, 2024). Insist on properly rated shingles installed to the manufacturer's high-wind nailing pattern (6 nails) and starter strips, or a wind claim can be denied for improper installation.
Find a Houston roofer →This is a planning estimate only — actual requirements depend on an on-site assessment by a licensed Houston pro. Wind-speed zones are approximate; your exact TDI/WPI-8 obligation depends on your address's designation. Verify with the Texas Department of Insurance before contracting.
How Gulf-Coast wind zones work
Design wind speeds rise as you approach the coast — from roughly 115–120 mph inside greater Houston to 140–150 mph on the Galveston coastal strip. The Texas Department of Insurance (TDI) designates a catastrophe area near the coast where windstorm coverage through TWIA requires certified, inspected construction.
Why WPI-8 matters
Inside the TDI designated catastrophe area, roof work must be inspected and documented with a WPI-8 Certificate of Compliance to be insurable through TWIA. No WPI-8 on file can mean a denied windstorm claim after a hurricane. Outside the zone, proper high-wind shingle installation still protects your standard-policy claim.
Frequently asked questions
Do I need a WPI-8 certificate for my Houston roof?
If your home is inside the TDI designated catastrophe area — generally the coastal counties and parts of the Bay Area — then yes, roof work must be inspected and documented with a WPI-8 Certificate of Compliance to remain insurable through TWIA. Inland Houston addresses usually do not, but proper high-wind installation still matters. Confirm your address's designation with TDI.
What wind speed should a Houston roof be rated for?
It depends on your sub-region: roughly 115–120 mph inland in greater Houston, 130 mph in the coastal-inland Bay Area, and 140–150 mph on the Galveston coastal strip. Your roofer selects shingles and fastening patterns to meet the rating for your zone.
Will insurance deny my roof claim after a hurricane?
It can, if the roof wasn't installed to code for your wind zone or (in the catastrophe area) lacks a WPI-8 certificate. Improper nailing patterns are a frequent reason for denial. Use a licensed roofer who documents compliance to protect your claim.
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