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TDI Forms Explained: WPI-1, WPI-2-BC-8, WPI-2E, WPI-8
There are four TDI forms in the windstorm inspection process, and they sound almost identical. Here’s a plain-English breakdown of what each one is, when it’s filed, and who is responsible for it — so you can stop confusing them on phone calls.
The four forms in order
Think of the forms as a timeline, not a list. Each one corresponds to a different moment in the project:
- WPI-1 — at the start, opens the inspection file
- WPI-2-BC-8 — during construction, after each inspection
- WPI-2E — at the end, the final certification package
- WPI-8 — issued by TDI after review, the actual certificate
Application for Certificate of Compliance
The starting form. Identifies the project address, owner, builder, and engineer. This is what opens the inspection file with TDI and tells the agency that a windstorm inspection is going to happen on this property.
What can go wrong: Filing late. If the WPI-1 isn’t on file before key inspections need to happen, the inspector cannot verify concealed work — and that work may not qualify for certification later.
Inspection Verification Form
This is the form the TDI Appointed Qualified Inspector (AQI) fills out after each inspection during construction. It documents what was inspected, what code provisions apply, design wind speed, exposure category, opening protection requirements, and whether the work conforms to the sealed drawings.
What can go wrong: The form requires sealed drawings to reference. If the structure was built without a Texas PE seal on the drawings, this form can’t be properly executed.
Engineer’s Certification (Final)
The final affidavit submitted by the engineer at the end of the project, certifying that the completed structure complies with the applicable windstorm building code. This is the document TDI reviews to decide whether to issue the WPI-8.
What can go wrong: Outstanding deficiencies. If any open items from the WPI-2-BC-8 reports haven’t been corrected and re-inspected, the engineer can’t sign the WPI-2E. The whole closeout stalls.
Certificate of Compliance
The certificate itself — the document that confirms the structure is eligible for windstorm and hail insurance through TWIA. It is issued by TDI, not by the engineer or inspector, after TDI reviews the WPI-2E and supporting file and finds it complete.
What can go wrong: Incomplete file. If TDI’s review finds missing inspection reports, missing seals, or unresolved deficiencies, the certificate is delayed or denied until the file is cleaned up.
Quick reference: WPI-1 opens the file. WPI-2-BC-8 documents each inspection. WPI-2E is the engineer’s final affidavit. WPI-8 is the certificate TDI issues at the end. The first three are work product. The fourth is the prize.
Who fills out what
This is the other source of confusion — different forms have different signers:
- WPI-1 can be filed by the owner, builder, contractor, or engineer. Practically, the engineer or inspector files it because they know the form best.
- WPI-2-BC-8 must be signed by a TDI Appointed Qualified Inspector (AQI). Not just any engineer — only one with the AQI appointment.
- WPI-2E must be sealed and signed by a Texas-licensed Professional Engineer.
- WPI-8 is issued by TDI. No signature from your engineer appears on the certificate itself.
Why the forms changed in April 2026
TDI updated the WPI-2-BC-8 form effective April 1, 2026 for projects that began construction after that date. The new form references IRC 2024 / IBC 2024 wind load provisions and the latest ASCE 7 design conditions. Older projects use earlier versions of the form referencing the code in effect at the time construction began.
If your project straddles the April 1, 2026 cutoff or you’re not sure which version applies, ask your inspector. The wrong form version is a common reason TDI sends a file back for correction.
Don’t want to track all four forms yourself?
Oasis Engineering handles the entire WPI-1 through WPI-2E process so TDI can issue your certificate. Flat fee. Three site visits. Pay deposit online to start.
View WPI-8 service →