Wind-Driven Rain and FORTIFIED Documentation Guide
TAS 100(A) Roof Vents for Louisiana Homes
TAS 100(A) is a test procedure used to evaluate how a roof ventilation product resists wind and wind-driven rain in a defined assembly. For a Louisiana homeowner, the important question is not whether a proposal says “hurricane vent.” It is whether the exact manufacturer and model can be documented, whether that product is suitable for the actual roof, and whether it will be installed according to its tested and manufacturer-required details.
Quick answer
What Does TAS 100(A) Mean on a Roof-Vent Proposal?
It means the exact vent product should have evidence showing that it was tested in accordance with TAS 100(A). The phrase is not a substitute for a manufacturer name, model number, product document or correct installation. For a project seeking a FORTIFIED Home™ designation under the 2025 standard, ridge and off-ridge roof vents must meet the TAS 100(A) requirement and be documented.
A passing vent does not make the entire roof FORTIFIED, calculate the attic ventilation, approve a mixed vent layout or guarantee that no water can ever enter. It confirms one performance requirement for one product used as part of a larger roof and ventilation system.
Tested product, defined assembly
What Is the TAS 100(A) Wind-Driven Rain Test?
TAS 100(A) is a Florida test protocol for the wind and wind-driven rain resistance of soffit ventilation and continuous or intermittent ventilation systems installed in the ridge area. Products evaluated under the protocol can include continuous ridge vents and intermittent units such as static vents, turbines or powered vents. The test uses a representative roof assembly and controlled wind-and-water exposure to measure performance under the procedure.
The result belongs to the product and configuration identified in the supporting report. That distinction matters. Two vents that look alike from the street may have different internal baffles, materials, fastening schedules, approved roof pitches or test documentation. A generic photograph, distributor category or statement that “this style is rated” does not establish that the unit delivered to the home is the tested model.
| Claim on a proposal | What should support it | What still needs verification |
|---|---|---|
| “TAS 100(A) vent” | Documentation for the exact manufacturer and model showing the TAS 100(A) result | That the delivered product matches the document and is acceptable for the planned project |
| “Wind-driven-rain resistant” | A test report, approval or manufacturer product information that identifies the applicable procedure | Roof pitch, roof-cover compatibility, installation method and current document status |
| “FORTIFIED compliant vent” | The vent documentation plus the applicable FORTIFIED checklist and evaluator review | Every other required roof component, site-specific documentation and final designation decision |
| “Enough ventilation” | Labeled net free area for the selected products and a project-specific ventilation calculation | Available soffit intake, clear air paths, attic divisions and whether the attic is vented or unvented |
| “Hurricane-ready installation” | A written product-specific scope and in-progress installation documentation | Fasteners, slot or opening, end treatment, flashing, roof covering and all site conditions |
Current program documents
How Does TAS 100(A) Relate to the 2025 FORTIFIED Home Standard?
The 2025 FORTIFIED Home standard applies to projects permitted on or after November 1, 2025. Where a roof permit is not required, it applies to roofs installed on or after that date. The standard aligns the ridge and off-ridge attic-vent requirement for High Wind and Hurricane designations: the roof-mounted vents must be tested in accordance with TAS 100(A).
The official re-roofing checklist states that all ridge and off-ridge roof vents must be tested according to TAS 100(A). For an existing roof vent on a project seeking a designation, the 2025 summary of changes says that if the TAS 100(A) rating cannot be verified, a new vent complying with the requirement must be installed.
Gable-end vents are handled separately. For Hurricane designations, a gable-end vent open to the attic must have temporary storm protection available, and the permanent attachment hardware for that cover must be installed. This is not the same as claiming every gable vent must be permanently sealed or that every home must be converted to ridge ventilation.
Verify the exact ridge-vent model, TAS 100(A) documentation, labeled ventilation capacity and installation instructions for the roof assembly.
Static vents, turbines and other roof-mounted units need documentation for the actual model rather than an assumption based on shape or brand.
For a Hurricane designation, review the separate temporary-cover requirement with the evaluator and document each opening that communicates with the attic.
The model number is the starting point
What Proof Should a Homeowner Request?
The 2025 FORTIFIED Roof documentation checklist is unusually specific about roof-mounted vents. It calls for at least one legible photograph of the packaging for each roof-mounted vent showing the manufacturer, model and TAS 100(A) rating. If the rating is not printed on the packaging, product information in PDF form must be included.
That means a product link sent after installation may not be enough. The evidence should connect the units installed at the address to the qualifying documentation. For FORTIFIED work, photos and documents must be site-specific, legible and coordinated with the evaluator.
- 01
Manufacturer and exact model
Record the brand and complete model or SKU before ordering. A family name without the exact unit can leave multiple sizes, materials or versions unresolved.
- 02
TAS 100(A) evidence
Obtain packaging that shows the rating or product information that expressly ties the exact model to testing in accordance with TAS 100(A). Save the document used for the decision.
- 03
Product installation instructions
Confirm the current instructions for roof pitch, opening or slot, fasteners, end closures, flashing and roof-cover integration. Do not substitute a detail from a different model.
- 04
Labeled net free area
Use the listed net free area, not the outside dimensions of the vent, when sizing intake and exhaust. The product must fit the ventilation plan as well as the storm-resistance requirement.
- 05
Site-specific installation photographs
Capture the delivered packaging and the critical in-progress details before shingles, caps or finished components conceal them. Coordinate the required views with the evaluator before work begins.
- 06
Written responsibility
The proposal should state who selects the vent, who confirms the documentation, who records installation and who supplies the evidence to the evaluator. Do not leave the handoff until project closeout.
Verify, replace or redesign
Can an Existing Roof Vent Stay During a FORTIFIED Reroof?
Age alone does not answer the question. The existing vent must first be identified by manufacturer and model. Its condition, attachment, surrounding roof details and supporting TAS 100(A) documentation must then be reviewed against the project requirements. If the required rating cannot be verified for a FORTIFIED project, the 2025 standard directs the team to install a new qualifying vent.
| Existing condition | Responsible next step | Why |
|---|---|---|
| Exact model and qualifying documentation are available; vent is in suitable condition | Have the contractor and evaluator confirm whether it may remain and how it will be documented | Verifiable paperwork is necessary, but condition and project compatibility still matter |
| Brand is visible but model is unknown | Do not infer compliance from the brand; continue identification or specify a documented replacement | Different models from one manufacturer can have different reports and instructions |
| No label, no packaging and no product document connects the vent to TAS 100(A) | For a FORTIFIED project, plan a new vent that can be verified | The 2025 standard does not allow an unverifiable existing vent to satisfy the requirement |
| Vent is bent, cracked, corroded, loose or has evidence of leakage | Evaluate replacement and the surrounding deck, flashing or roof-cover condition | A past test result does not establish the condition of an aged or damaged field installation |
| Multiple exhaust types serve the same connected attic | Review the ventilation layout before choosing replacement products | The project may need a system redesign, not a one-for-one hardware swap |
| Attic is designed as an unvented or conditioned assembly | Confirm the building-envelope design before adding any vents | Adding openings can conflict with the intended assembly and moisture-control strategy |
A tested vent still needs a working system
What Else Must Be Checked Besides TAS 100(A)?
TAS 100(A) addresses wind and wind-driven rain performance under the test procedure. It does not replace ventilation design. A roof can have documented vents and still have blocked intake, disconnected attic zones, too little exhaust, excessive exhaust or an arrangement that pulls air through another upper vent instead of from the eaves.
Vented or unvented attic
First establish what assembly the home actually has. A conventionally vented attic and an intentionally conditioned attic should not receive the same vent plan.
Net free area
Calculate with the labeled NFA of the exact products. Outside dimensions, ridge length alone and nominal turbine diameter do not provide a complete calculation.
Low intake
Confirm that soffit or eave intake exists, is open to the attic and is not blocked by insulation, paint, debris or missing baffles.
Connected attic zones
Additions, vaulted sections, changes in ceiling height and framing divisions can separate areas that look like one roof from the exterior.
Exhaust layout
Ridge vents, turbines, static vents and powered fans should not be combined casually. Review whether one exhaust opening can become intake for another.
Moisture source
Attic staining may come from a roof leak, flashing defect, duct condensation, indoor air leakage or wind-driven rain. A vent replacement is not an automatic cure for every moisture symptom.
For calculations, intake-to-exhaust balance and the differences among common vent types, use the separate attic ventilation guide for Louisiana. For a product-layout decision, compare ridge vents and turbine vents on Gulf Coast roofs. Keeping those decisions separate prevents a test-document page from turning into a generic ventilation article.
The tested detail must reach the roof
Which Installation Details Should Be Written Into the Scope?
A product can be correctly selected and poorly installed. The written scope should identify enough detail to connect the chosen vent to the roof-cover system, manufacturer instructions and FORTIFIED documentation plan. Exact requirements vary by product, so a responsible proposal avoids one universal fastening or slot specification for every vent.
- Exact vent schedule: manufacturer, model, quantity, location and whether each unit is new or existing.
- Applicable product documents: the TAS 100(A) evidence and current installation instructions used for the proposal.
- Roof pitch and covering: confirmation that the product and detail are compatible with the actual slope and roof-cover type.
- Opening dimensions: ridge slot or individual opening sized and terminated according to the selected product instructions.
- Fasteners: type, length, corrosion resistance, location and spacing required for the model and exposure.
- Ends and transitions: end plugs, stops, intersections, hips, changes in ridge height and short sections handled according to the product detail.
- Flashing and water path: off-ridge bases, curbs or flanges integrated with the underlayment and roof covering in the correct sequence.
- Ridge-cap shingles: compatible caps and fastening that do not block the designed exhaust path or violate the covering instructions.
- Abandoned openings: old vent penetrations closed with an appropriate deck and roofing repair rather than simply covered by underlayment.
- Intake verification: the low intake and air path checked before the exhaust quantity is finalized.
- In-progress photos: required views assigned before the work is concealed.
- Closeout package: product information, relevant photographs, warranties and contractor forms supplied to the appropriate parties.
Compare evidence, not slogans
What Should a TAS 100(A) Vent Estimate Include?
Vent cost cannot be reduced to a universal price per foot or per unit. Total scope depends on roof geometry, access, roof-cover condition, number and type of existing penetrations, ridge preparation, deck repair, intake changes and whether the work is part of a reroof. A clear proposal separates known work from concealed conditions.
Be cautious when a quote promises guaranteed insurance savings, automatic grant approval, complete hurricane protection or a FORTIFIED designation from installing vents alone. Incentives, underwriting and program eligibility are separate decisions. Request written, current information from the responsible program, insurer or evaluator.
Project scope by location
How SHIC Handles Roof-Vent Work in Southeast Louisiana
Southern Home Improvement Center reviews roof ventilation as part of qualifying roof replacement and major roof repair projects across its service area. On a FORTIFIED project, product selection and documentation should be coordinated with the certified evaluator before critical work is covered.
Related SHIC resources
Continue With the Guide That Matches Your Next Decision
Frequently asked questions
TAS 100(A) Roof Vent FAQ
What is a TAS 100(A) roof vent?
It is a roof ventilation product with documentation showing that the exact model was tested in accordance with TAS 100(A), a wind and wind-driven rain test procedure. Verify the manufacturer, model and supporting document rather than relying only on the vent style or a sales description.
Does every Louisiana roof legally require TAS 100(A) vents?
No universal statement covers every Louisiana roof. Local code, permit conditions, product approvals, contract requirements and voluntary programs can differ. The 2025 FORTIFIED Home standard requires ridge and off-ridge roof vents on applicable designation projects to be tested in accordance with TAS 100(A).
Do TAS 100(A) vents make a roof FORTIFIED?
No. A qualifying vent satisfies one component requirement. A FORTIFIED designation depends on the complete applicable roof scope, qualified providers, site-specific documentation, independent evaluation and IBHS review.
Can an existing roof vent remain on a FORTIFIED reroof?
It may be considered only after the exact product, condition and qualifying documentation are verified for the project. Under the 2025 FORTIFIED standard, if the TAS 100(A) rating of an existing vent cannot be verified, a new vent meeting the requirement must be installed.
How do I prove that a vent meets the TAS 100(A) requirement?
For 2025 FORTIFIED documentation, provide at least one legible packaging photo for each roof-mounted vent showing the manufacturer, model and TAS 100(A) rating. If the rating is not shown on the packaging, include product information in PDF form that connects the exact model to the requirement.
Does a TAS 100(A) vent guarantee that no rain will enter?
No. Testing measures performance under a defined procedure and assembly. Field performance also depends on product condition, roof geometry, opening dimensions, flashing, fasteners, roof-cover integration, maintenance and installation quality.
Does TAS 100(A) tell me how much attic ventilation I need?
No. Use the labeled net free area of the exact intake and exhaust products in a project-specific ventilation calculation. TAS 100(A) addresses wind and wind-driven rain performance, not whether the attic has enough balanced airflow.
What happens to gable-end vents on a FORTIFIED project?
For Hurricane designations, gable-end vents open to the attic require temporary storm protection to be available, with permanent attachment hardware installed for the cover. Review the exact opening and documentation plan with the certified evaluator.
Free written roofing estimate
Verify the Vent Before It Goes on the Roof
Southern Home Improvement Center can review the vent schedule as part of a qualifying roof replacement or major roof repair, document the specified products and coordinate the FORTIFIED roofing scope with your evaluator. Include the property address, roof concern and whether you are seeking a FORTIFIED designation when requesting an estimate.
Request a Free Estimate Southern Home Improvement Center • Louisiana contractor license 81801 • Serving Gulf Coast homeowners since 1991