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WPI-8 Windstorm Certifications for the Texas Coast
The Texas Department of Insurance certificate of compliance that windstorm coverage depends on, obtained through the licensed engineer path rather than the TDI inspector queue.
Opening soon
Sealed Engineering is not yet accepting orders. Firm registration is pending with the Texas Board of Professional Engineers and Land Surveyors, and no engineering services are being offered or performed under this brand until it is granted. Founding customers on the waitlist are contacted first when ordering opens.
Where the requirement applies
The Texas Department of Insurance designates a catastrophe area along the coast. It covers fourteen seaward counties in full, Aransas, Brazoria, Calhoun, Cameron, Chambers, Galveston, Jefferson, Kenedy, Kleberg, Matagorda, Nueces, Refugio, San Patricio, and Willacy, plus, in the department's own wording, parts of Harris County east of Highway 146. TDI names La Porte, Morgan's Point, Pasadena, Seabrook, and Shoreacres among the Harris County areas covered.
Inside that area, construction has to comply with the windstorm building code, and compliance has to be documented before the Texas Windstorm Insurance Association will write or continue wind and hail coverage on it. The document that records it is a certificate of compliance, and which certificate depends on whether the work is ongoing or already finished.
Ongoing construction and completed construction are two different processes
This is the distinction that decides everything else, and it is the one most often got wrong. TDI treats work that has not started yet and work that is already finished as separate processes with separate forms and separate certificates.
For ongoing construction, Form WPI-1, the Application for Certificate of Compliance, is filed with TDI before construction begins. Inspections are then performed while the work is underway, by either a TDI windstorm inspector or an appointed Texas licensed professional engineer. TDI is explicit that inspections must happen during the work rather than before or after it, which is precisely why covering something up ends this route. On completion the inspector or engineer submits the WPI-1 and the applicable WPI-2-BC forms, and TDI issues the WPI-8 Certificate of Compliance. TDI charges no fee for its own inspectors, and that path moves at the speed of the inspector queue.
For completed construction, where no WPI-1 was ever filed, the route is different in a way that matters. TDI states that any professional engineer licensed by the Texas Board of Professional Engineers and Land Surveyors may perform inspections on completed construction, so appointment is not required here as it is for ongoing work. The engineer submits Form WPI-2E, the Completed Construction Inspection Form, together with a sealed post-construction inspection report and supporting documentation, or a sealed design. TDI then issues a WPI-8E certificate rather than a WPI-8.
One piece of history worth knowing if you are reading old paperwork: certificates numbered WPI-8C were issued by the Texas Windstorm Insurance Association for completed construction between January 1, 2017 and May 31, 2020. A WPI-8C in a file is not a WPI-8E and was issued by a different body.
Work finished years ago with nothing filed is the most common reason a coastal file reaches an engineer, and the completed construction route is the remedy for it.
What gets evaluated
The evaluation is against the wind load requirements that apply at the specific site, which on the Texas coast are among the highest in the country. The load path is the whole question: wind pressure on the envelope has to travel through the sheathing into the framing, through the framing into the walls, and through the walls into the foundation, with a connection at every one of those transitions that is capable of carrying it.
- Roof covering and its attachment, including fastener pattern and edge treatment.
- Roof deck attachment to the framing.
- Roof to wall connections, which is where the load path most often fails on older coastal homes.
- Wall to foundation anchorage.
- Opening protection: windows, doors, and garage doors, and their impact and pressure ratings.
- Product approvals and evaluation reports for the specific assemblies installed.
Evidence for completed work
Work that is already covered up is the hard case. Connections cannot be evaluated by looking at a finished ceiling, so the evaluation depends on what can be exposed, what can be reached from the attic, and what documentation exists from when the work was done. Photographs taken during construction are worth a great deal here, and contractors on the coast should be taking them for every job whether or not anybody has asked.
Where the evidence does not support certification, the certification is not issued. That is an uncomfortable outcome and it is the correct one, because a WPI-8 that does not reflect the building is a coverage problem that surfaces at the worst possible moment.
What arrives
- Site inspection of the work by a professional engineer licensed by the Texas Board of Professional Engineers and Land Surveyors.
- Evaluation against the applicable windstorm building code requirements for the site.
- For completed construction: Form WPI-2E with a sealed post-construction inspection report and supporting documentation, prepared for submission to TDI.
- A photo and documentation record supporting the certification.
- Any items that must be corrected before certification, itemized.
- Coordination through to the certificate TDI issues, a WPI-8E for completed construction.
Set by the site inspection and by TDI processing, which is outside anyone's control but is tracked through to issuance.
What has to exist first
An engineer seals what the evidence supports, so this list is the work rather than the paperwork around it. Anything missing is named rather than assumed.
- Property address and county, so the applicable requirements are the right ones.
- Scope of the work: new construction, addition, reroof, window or door replacement, or other.
- Approximate date the work was completed, if it is already done.
- Any WPI-1 application, prior WPI-8, or permit records.
- Construction photographs, especially of connections and fastening before cover.
- Product approvals, evaluation reports, or manufacturer documentation for installed assemblies.
WPI-8 Windstorm Certifications: common questions
Do I need a WPI-8 if I am not on the coast?
No. The requirement applies only inside the TDI designated catastrophe area: the fourteen seaward counties and the part of Harris County east of Highway 146. If the property is outside that area, there is no WPI-8 and no windstorm certificate to obtain.
The roof was replaced two years ago and nobody filed anything. Is it too late?
Not necessarily. That is completed construction, and TDI has a route for it: any engineer licensed by the Texas Board of Professional Engineers and Land Surveyors may inspect completed work and submit Form WPI-2E with a sealed post-construction report, after which TDI can issue a WPI-8E. What determines whether it succeeds is the evidence: what can be inspected now, what can be exposed, and what documentation exists from the original work. Photographs taken during the reroof make an enormous difference.
Does a WPI-8 mean my house is hurricane proof?
No. It records that the specific work certified complies with the windstorm building code requirements that applied to it. It says nothing about the rest of the structure, it is not a prediction about any particular storm, and it is not a warranty.
Is a WPI-8 the same thing as a windstorm insurance policy?
No. The certificate is a compliance document issued by the Texas Department of Insurance. The policy is written by TWIA or by a private carrier. The certificate is what makes the property eligible for the coverage, and getting one does not by itself put a policy in force.
Can the certification be issued without the engineer coming out?
No. The engineer's certification is a statement about work that was inspected, and TDI's completed construction route is built around a sealed post-construction inspection report. That inspection is the certification, and there is no document route around it.
Where this is ordered most in Texas
Wind speed, soil, and the permit office all change by market, and so does what this document has to address. These pages are written for the market rather than templated across it.
Often needed alongside this
- Site visit requiredRoof Certification LettersThe letter an underwriter asks for when the appraiser flags the roof: condition observed, deficiencies named, and an estimate of remaining useful life, sealed by an engineer.What it contains
- Documents or site visitStructural Letters for PermitsPlan review asked for a sealed letter and the project stopped. This is the deliverable that restarts it: a specific structural question answered, sealed, and addressed to the reviewer who asked.What it contains
- Document reviewSolar Structural LettersThe stamped letter your plan reviewer asks for before a rooftop array goes on: existing framing capacity, wind uplift at the actual site, and attachment spacing that resists it.What it contains
Need a wpi-8 windstorm certification?
Start with the property address and we will tell you exactly what else is needed.
Opening soon. Founding customers get first turnaround slots.