Texas changed the building-code basis used for windstorm certificate applications in 2026. For coastal remodeling projects, that affects how roof replacements, windows, siding, and other alterations are specified, documented, and inspected.
This article is dated August 2026 and summarizes TDI’s adopted-code page. It does not interpret the code for a specific structure. The engineer, inspector, designer, manufacturer documents, and applicable authority should confirm the requirements for the property.
Key point: Texas changed the building-code basis used for windstorm certificate applications in 2026. For coastal remodeling projects, that affects how roof replacements, windows, siding, and other alterations are specified, documented, and inspected.
What Changed on April 1, 2026
TDI states that WPI-1 applications submitted starting April 1, 2026, must be certified using either the 2024 International Residential Code or the 2024 International Building Code. The correct code depends on the structure and project. Older proposals should be reviewed if construction or certification crosses the transition date.
The Catastrophe Areas Did Not Change
The code edition changed, but TDI says the designated catastrophe areas remained the same. Entire listed coastal counties are generally included; Harris County is treated differently, with covered locations east of Highway 146 and within specified city limits. Always verify the address on the official map.
Wind Speed Is Property-Specific
A single wind speed should not be copied across Greater Houston. TDI says the required speed is determined for each structure based on location, using appropriate hazard tools and code criteria. Exposure, building type, height, components, and cladding can affect the design path.
What It Means for Roofs, Windows and Siding
Roof assemblies may require documented deck attachment, underlayment, flashing, edge metal, and roof-covering compliance. Windows and doors may need product and anchorage documentation. Siding and wall work can involve fastening, sheathing, water-resistive layers, and opening details. The exact inspection stages must be planned before concealment.
Windborne-Debris Protection
TDI notes that much of the designated area is now within a windborne-debris region under the adopted codes. Whether protection is required depends on the location and structure. Do not describe a product as impact-rated or code-compliant without documentation for the exact model, size, configuration, anchorage, and use.
A Better Preconstruction Workflow
First verify the property location, then identify the code and certification path, retain the inspector or engineer, select documented products, put inspection hold points into the schedule, and keep invoices, labels, photos, and approvals together. Use the companion WPI-8 guide for certificate timing and lookup.
A Practical Houston Decision Checklist
Before approving work or relying on a recommendation, connect the visible symptom to the actual building condition, product documents, applicable requirements, and written scope. Houston heat, humidity, sudden downpours, wind-driven rain, and storm exposure can magnify a weak detail, but climate alone does not prove a particular repair is necessary.
- Document the current condition with dated notes and photographs from safe locations.
- Confirm the exact product, assembly, property address, and responsible professional.
- Compare written scopes that identify preparation, repairs, exclusions, and change-order procedures.
- Keep permits, inspections, warranties, invoices, and completion records together.
- Avoid guarantees about code, insurance, energy savings, lifespan, or performance that are not supported in writing.
Frequently Asked Questions
When did the 2024 IRC and IBC become effective for TDI windstorm applications?
TDI states that the new code basis applies to WPI-1 applications starting April 1, 2026.
Did the 2026 change expand the coastal catastrophe area?
No. TDI says the designated catastrophe areas remained the same.
Does a product approval guarantee my project will pass?
No. Approval is only one part of compliance; the exact product, configuration, anchorage, installation, and inspection also matter.
Authoritative Sources
Related Tekton Resources
Need a property-specific assessment? Request an evaluation from Tekton Exteriors. Recommendations depend on the building, conditions, applicable requirements, and written project scope.
