WPI-8 Windstorm Certificates, Explained for Coastal Texas Homeowners

The usual introduction to this subject is unwelcome. A roof was replaced two years ago, or windows were changed during a remodel, and now an insurance renewal or a closing has produced a request for a WPI-8 that nobody has ever heard of. The work is finished, it is covered up, and the person who did it has moved on.

This explains what the certificate is, who needs one, how the two routes to getting one differ, and what can be done when the work is already complete.

Where the requirement applies

The Texas Department of Insurance designates a catastrophe area along the Gulf Coast. It covers fourteen seaward counties in full, plus, in the department's wording, parts of Harris County east of Highway 146.

The fourteen counties are Aransas, Brazoria, Calhoun, Cameron, Chambers, Galveston, Jefferson, Kenedy, Kleberg, Matagorda, Nueces, Refugio, San Patricio, and Willacy.

The single most important thing about that list is that it is a list of counties, not a distance from the water. Harlingen sits roughly twenty five miles inland and is inside the requirement because it is in Cameron County. Victoria sits closer to the coast than some covered locations and is outside it, because Victoria County is not on the list, while neighbouring Calhoun and Refugio counties are. People are caught out by this every year, in both directions.

What a WPI-8 is

Inside the designated area, construction has to comply with the windstorm building code, which is based on the International Residential and Building Codes with wind loads determined under ASCE 7 for some of the highest design wind speeds in the country. Compliance has to be documented, and the document that records it is a certificate of compliance issued by the Texas Department of Insurance: a WPI-8 for ongoing construction, or a WPI-8E for construction that is already finished.

It matters because the Texas Windstorm Insurance Association, which is the insurer of last resort for windstorm and hail coverage in this area, requires that documentation before it will write or continue coverage on the improvement. Without coverage, a mortgage requirement goes unmet, which is how this becomes urgent very quickly.

The requirement covers far more than new houses. Reroofs, window and door replacements, additions, and many detached structures all trigger it. If the work touches the building envelope in a covered county, assume it applies until somebody establishes otherwise.

Ongoing work and finished work are two different processes

This is the distinction that decides everything else, and almost every confused conversation about windstorm certificates comes from collapsing it. TDI handles construction that has not started yet and construction that is already finished through separate processes, with separate forms and separate certificates.

Ongoing construction

Before work begins, Form WPI-1, the Application for Certificate of Compliance, is filed with TDI. Inspections then happen while the work is underway, performed by either a TDI windstorm inspector or an appointed Texas licensed professional engineer. TDI is explicit that inspections must occur during the construction or repair rather than before or after it, which is exactly why covering something up closes this route off.

On completion, the WPI-1 and the applicable WPI-2-BC forms go to TDI, and TDI issues the WPI-8 Certificate of Compliance. TDI does not charge a fee for its own inspectors. What that route costs instead is time, because it moves at the speed of the inspector queue, and after an active storm season that is not fast.

Completed construction

Where no WPI-1 was ever filed and the work is finished, there is a separate route, and one detail in it is worth reading twice. TDI states that any professional engineer licensed by the Texas Board of Professional Engineers and Land Surveyors may perform inspections on completed construction. Appointment is required for ongoing work and is not required here.

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 rather than a WPI-8. This is the route most people arrive at, because most people find out about any of this when a renewal or a closing asks for paperwork nobody obtained.

One piece of history, 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 is not a WPI-8E and came from a different body.

What is actually evaluated

The whole question is the load path. Wind pressure on the building envelope has to travel through the covering into the deck, through the deck 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 capable of carrying it. A chain with one weak link fails at that link, and on older coastal homes the weak link is usually the same one.

• Roof covering and its attachment: fastener type, pattern, and edge treatment. On a reroof this is the primary item.
• Roof deck attachment to the framing, including nail size, spacing, and whether the pattern is adequate at panel edges.
• Roof to wall connections. This is where the load path most often fails on older Texas coastal housing, and it is the item that is most difficult to evaluate once ceilings are closed.
• Wall to foundation anchorage.
• Opening protection: windows, doors, and garage doors, and their impact and pressure ratings. Garage doors are a recurring weak point because a failed garage door pressurizes the building and takes the roof with it.
• Product approvals and evaluation reports for the specific assemblies installed, which is documentation rather than inspection and is frequently the item that is missing.

Completed work: what determines whether it can be certified

This is the hard case and it deserves a straight answer. Connections cannot be evaluated by looking at a finished ceiling. What can be certified depends on three things.

1. What can be inspected now. Attic access is enormously valuable, because roof to wall connections and deck attachment are frequently visible from inside the attic even when nothing else is.
2. What can be exposed. Opening a small area of soffit or interior finish at representative locations is often enough, and it is far cheaper than the alternative.
3. What documentation exists. Photographs taken during construction are worth a great deal here, along with product approvals, invoices, and permit records.

Contractors working the Texas coast should be photographing every connection and every fastening pattern before it is covered, on every job, whether or not anybody has asked. It costs nothing at the time and it is the difference between a straightforward certification and an expensive one later.

Where the evidence does not support certification, the certification is not issued. That is uncomfortable and it is correct, because a WPI-8 that does not reflect the building is a coverage problem that surfaces at the single worst possible moment: after a storm.

What the certificate does not mean

• It does not mean the house is hurricane proof. 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. A certificate for a reroof is about the roof.
• It is not an insurance policy. The certificate makes the property eligible for coverage; a policy is written separately by TWIA or a private carrier.
• It is not a city permit and a city permit is not it. They are separate processes with separate authorities, and completing a city inspection does not satisfy the windstorm requirement.

If you are buying or selling coastal property

Missing windstorm documentation on prior work is one of the most common late surprises in a coastal Texas file. It is worth asking the question early rather than during an option period.

For a seller, obtaining certification before listing removes an obstacle at the point where there is time to deal with it. For a buyer, asking for the WPI-8 documentation on every improvement made since purchase is a five minute question that occasionally saves a transaction. For an agent working this coast, it belongs on the intake checklist alongside the survey.

Practical steps

1. Confirm the county. It is decided by county, not by how far the water is.
2. List the work: what was done, roughly when, and by whom.
3. Gather everything. Permits, invoices, product documentation, and above all any photographs taken during construction.
4. Establish what can be accessed, particularly the attic.
5. Then get an engineer's evaluation. What can be certified follows from the four steps above, and knowing that before starting is better than discovering it halfway through.