A small section of roof where shingles are removed to inspect for hidden damage beneath the surface — and a tool that can either confirm your claim or become a battleground between you and your carrier.
What a Test Square Is
A test square is a defined section of roof — typically 10 feet by 10 feet, or 100 square feet — where shingles are carefully removed to expose the underlayment and decking beneath. The exposed area is then inspected for damage that is not visible from the surface: deteriorated underlayment, rotted or damaged decking, failed fasteners, and evidence of water infiltration that has not yet caused an active leak.
Test squares serve a straightforward purpose: they allow inspectors to see what is actually happening beneath the roof’s surface layer. On an older roof in Colorado’s hail corridor, what is happening beneath the shingles is often more significant than what is visible on top.
When Test Squares Are Used
Test squares come up in roof insurance claims in two primary contexts — and understanding the difference matters for how you respond when one is requested or recommended.
Adjuster-Requested Test Squares
Insurance adjusters sometimes request a test square when surface damage is ambiguous — when they cannot determine from a standard inspection whether the damage they are seeing is storm-related or pre-existing. By removing shingles in a representative area, the adjuster can inspect the underlayment and decking for evidence that helps establish causation and the extent of damage.
When an adjuster requests a test square, the cost of the test is typically covered by the insurance company if damage is found. If no damage is found, the homeowner may be responsible for the repair cost — though this varies by carrier and policy. Clarify who bears the cost before agreeing to a test square requested by the adjuster.
Contractor-Recommended Test Squares
Contractors and roof consultants may recommend test squares on older roofs where surface inspection suggests the possibility of concealed damage. Opening a representative section before committing to a full replacement scope gives everyone — the homeowner, the contractor, and the carrier — a clearer picture of what is actually present beneath the surface.
On roofs with skip sheathing, aged underlayment, or a history of leaks, a contractor-recommended test square before the insurance inspection can strengthen the claim by providing documented evidence of subsurface conditions that the adjuster would otherwise have to accept on faith.
What a Test Square Reveals
The value of a test square is in what becomes visible once shingles are removed. A thorough test square inspection looks for:
Underlayment Condition
The underlayment — felt paper or synthetic — is the secondary water barrier beneath shingles. On an older roof that has sustained hail damage, underlayment may show tears, brittleness, or areas where it has separated from the decking. Compromised underlayment is a functional damage finding that supports a replacement claim rather than a repair-only scope.
Decking Condition
The wood decking beneath the underlayment absorbs moisture from any penetration in the layers above it. Water intrusion from storm damage — even water that has not reached the interior — can cause OSB to swell and delaminate or plywood to soften and rot. Decking damage discovered in a test square that can be linked to storm-related water intrusion qualifies as concealed damage for a supplemental claim.
Skip Sheathing Gap Assessment
On homes with older skip sheathing — spaced wooden boards rather than continuous panels — a test square can reveal whether the gaps between boards exceed the code-allowed maximum. In Colorado Springs under the 2021 IRC, gaps exceeding ¼ inch require OSB overlay before new shingles can be installed. In Pueblo under the 2009 IBC, the threshold is ½ inch. A test square that exposes skip sheathing with excessive gaps documents a code upgrade requirement that the insurance estimate must address.
Fastener Condition
The nails or staples holding shingles to the decking can be pulled, corroded, or improperly installed. A test square reveals fastener patterns and conditions that are relevant to both the quality of the prior installation and the extent of storm-related damage.
Evidence of Prior Water Infiltration
Staining, mold, or biological growth on the decking surface indicates that water has penetrated the roof system at some point — even if no active leak is present. If that water infiltration can be connected to storm-related damage rather than pre-existing neglect, it supports a broader damage scope than surface inspection alone would reveal.
Test Squares and Insurance Claims
Test squares interact with insurance claims in several specific ways that Colorado homeowners need to understand before agreeing to one or requesting one.
Who Pays for the Test Square
The general industry position is that test square costs are covered by the insurance company when damage is found — because the test is part of establishing the scope of a covered loss. When no damage is found, the homeowner typically bears the cost of the test and the repair of the opened section.
Before agreeing to a test square requested by your adjuster, get written confirmation of who pays in each scenario. Verbal assurances are not sufficient. If the carrier will not confirm in writing that they cover the cost when damage is found, that is worth noting before agreeing to proceed.
Test Square Location Matters
The location of the test square affects what it reveals. An adjuster who selects a test square location on a less-damaged area of the roof may find less damage than a square opened in a higher-impact zone. If you believe the adjuster’s chosen location is not representative of the worst damage on the roof, you have the right to request that the test square be conducted in a more representative location — or that multiple test squares be opened in different areas.
Photographing the Test Square
Everything revealed during a test square opening should be photographed thoroughly before any repairs begin. Photographs of underlayment condition, decking damage, skip sheathing gaps, and fastener issues become part of the claim documentation. If the test square is opened by a contractor rather than the adjuster, photographs taken before the adjuster’s follow-up inspection provide an independent record that cannot be disputed after the fact.
Test Squares and Supplemental Claims
When a test square reveals damage that was not included in the initial scope — rotted decking, deteriorated underlayment, skip sheathing requiring overlay — that damage is the basis for a supplemental claim. The supplement should include photographs, measurements of the affected area, and documentation connecting the damage to storm-related water intrusion rather than pre-existing neglect.
When to Request a Test Square
A test square is worth requesting or recommending in these situations:
- Your carrier denies surface damage as insufficient — if the adjuster claims there is not enough visible damage to warrant replacement, a test square that reveals subsurface damage may change that determination
- Your roof has a history of leaks — prior water infiltration often causes decking and underlayment damage that is not visible from the surface but becomes apparent once shingles are removed
- Your home was built before the mid-1980s — these homes frequently have skip sheathing that may require OSB overlay under current code, and a test square confirms the gap measurements
- The adjuster’s scope seems incomplete relative to the roof’s age and condition — a test square provides objective subsurface evidence that supplements the surface inspection
- Your contractor suspects concealed damage based on surface indicators — soft spots, unusual deflection underfoot, or visible staining from the attic side all suggest subsurface conditions worth confirming before finalizing the scope
Common Test Square Questions
How much does a test square typically cost?
A test square typically involves removing shingles in a 10×10 section, inspecting the exposed area, and then repairing the opening — reinstalling shingles or temporarily sealing the area. Costs vary by contractor and market conditions but generally range from a few hundred dollars for a straightforward repair to more if significant damage is found and the repair scope expands. When the carrier covers the cost on a positive finding, that cost appears as a line item in the claim estimate.
Can the adjuster require me to allow a test square?
Your policy’s cooperation clause typically requires you to cooperate with the carrier’s reasonable investigation — which may include allowing a test square if the adjuster determines it is necessary to assess the claim. Refusing a reasonable test square request could give the carrier grounds to dispute the claim. However, you have the right to be present during the test, to have your contractor present, and to document everything that is revealed.
What if the test square reveals damage the carrier still refuses to cover?
If a test square reveals damage that you believe is storm-related and the carrier still refuses to include it in the scope, you have the same options available as in any coverage dispute — re-inspection request, supplemental claim submission, appraisal clause invocation, DOI complaint, or legal consultation. The test square documentation — photographs, measurements, and inspection notes — becomes the evidence for that dispute.
How many test squares should be opened on a large roof?
There is no universal standard. A single test square may be representative on a simple, uniform roof. On a larger or more complex roof with multiple sections, dormers, or a history of varying performance, multiple test squares in different locations provide a more complete picture. If your adjuster proposes a single test square on a large roof, requesting additional test squares in other areas is reasonable — particularly if surface damage patterns suggest the damage is not uniform.
How Claim Advocacy Helps With Test Squares
Test squares are high-stakes moments in a roof claim. What is revealed — and how it is documented — can significantly affect the scope of the claim and the final settlement. Having professional support during this process ensures the results work in your favor.
- Location selection — recommending test square locations that are most likely to be representative of the roof’s actual condition and damage extent
- Documentation — photographing and measuring everything revealed before any repairs begin, creating an independent record that supports the claim
- Code requirement identification — identifying skip sheathing gaps, underlayment failures, and other conditions that trigger code upgrade requirements
- Supplement preparation — translating test square findings into a properly documented supplemental claim with supporting evidence
- Carrier response management — ensuring the carrier’s response to test square findings is appropriate and that any denial of supplement items is properly challenged
Related Glossary Terms
- Concealed Damage
- Skip Sheathing
- Deck / Sheathing
- Underlayment
- Supplemental Claim
- Scope of Loss
- Code Upgrade Coverage
- Tear-Off
- Adjuster
Not Sure What’s Beneath Your Roof’s Surface?
On an older Colorado roof, what you cannot see from the surface is often more significant than what you can. A free inspection includes a thorough assessment of surface indicators that suggest subsurface conditions — and a recommendation on whether a test square is warranted before your carrier finalizes the scope of your claim.
📞 Call to discuss your claim: (719) 210-8699
📧 Email: gerald@winik.io