Concrete Cancer FAQ: Pool Questions Answered

The phrase “concrete cancer” can create more fear than understanding. This FAQ is designed to answer the questions Central Texas buyers, sellers, and homeowners are most likely to ask about alkali-silica reaction, swimming-pool inspections, repairs, insurance, disclosure, home value, and real estate transactions.

The answers are intentionally direct, but a short answer cannot replace evaluation of an individual pool. Cracking and water loss can have several causes, and ASR may require engineering, core sampling, petrographic examination, or laboratory testing before it can be confirmed.

For a complete overview, read Understanding Concrete Cancer in Swimming Pools Without Panicking and Concrete Cancer in Texas Pools.

TLDR: Concrete Cancer FAQ: Answers for Central Texas Pool Owners, Buyers, and Sellers

Concrete cancer usually refers to alkali-silica reaction, or ASR, in the current Central Texas pool discussion.
ASR is documented in Central Texas, but not every crack, newer pool, or area pool is affected.
Reliable diagnosis may require more than a visual inspection.
Repair options and costs depend on the individual pool, damage, future expansion, and complete scope.
Pool concerns can affect insurance, disclosure, value, financing, negotiations, and future resale.

Understanding Concrete Cancer

What is concrete cancer in a swimming pool?

Concrete cancer is an informal term commonly used in the Central Texas pool discussion for alkali-silica reaction, or ASR. ASR can occur when reactive silica in aggregate interacts with alkalis in concrete while enough moisture is present, creating a gel that can absorb water, expand, and contribute to cracking.

Is concrete cancer the same as ASR?

In the current Central Texas swimming-pool discussion, concrete cancer usually refers to alkali-silica reaction, commonly shortened to ASR.

Is concrete cancer a real problem in Central Texas?

Yes. A 2024 forensic engineering paper published through the American Society of Civil Engineers reported more than 100 affected pools in and around Central Texas.

Does every Central Texas pool have concrete cancer?

No. ASR is a documented regional problem, but there is no reliable public evidence showing that most Central Texas pools are affected.

Does every pool built after 2017 have ASR?

No. Construction year may justify additional questions, but it does not establish which concrete materials were used or whether damaging expansion is occurring.

Can older pools have concrete cancer?

Possibly. Pool age alone cannot confirm or rule out ASR. Older pools can also have cracking, leaks, movement, and finish problems caused by other conditions.

What causes ASR in concrete?

ASR generally requires reactive silica in aggregate, sufficient alkalis in the concrete, and enough moisture to support the reaction and expansion.

Why are swimming pools vulnerable to ASR?

A swimming pool shell remains in a moisture-rich environment because it is designed to hold water. Moisture alone does not cause ASR, but it can support damaging expansion when susceptible concrete materials are present.

Is every pool crack a sign of concrete cancer?

No. Pool cracks can result from shrinkage, soil movement, plumbing leaks, hydrostatic pressure, workmanship, corrosion, drainage problems, or ordinary finish deterioration.

What does map cracking look like?

Map cracking is a network of irregular, interlocking cracks that may resemble a road map, dried mud, or alligator skin. It can be associated with ASR, but it is not a diagnosis by itself.

Can white deposits around cracks prove ASR?

No. Deposits may be associated with ASR, but they may also be efflorescence, calcium scale, or minerals transported by water moving through concrete.

Can concrete cancer be diagnosed from photographs?

No. Photographs can document visible symptoms, but reliable diagnosis may require an onsite investigation, engineering review, core sampling, petrographic examination, or laboratory testing.

What is petrographic examination?

Petrographic examination is a detailed study of concrete and its components, often using prepared samples and microscopy to look for internal cracking, reaction products, and other evidence.

Inspections and Diagnosis

Who can diagnose concrete cancer in a pool?

Depending on the circumstances, diagnosis may involve a qualified pool professional, licensed professional engineer, concrete materials specialist, petrographer, and testing laboratory.

Can a regular home inspector confirm ASR?

A home inspector may identify visible concerns and recommend further evaluation, but confirmation may require specialized engineering and materials testing.

Should buyers order a separate pool inspection?

A dedicated pool inspection is often worthwhile because the scope of a general home inspection may not include a detailed evaluation of the pool shell, equipment, plumbing, electrical systems, safety features, and repair history.

What should a pool inspection include?

A useful inspection may address the visible shell and finish, tile, coping, deck, equipment, circulation, filtration, heating, electrical safety, barriers, drain covers, visible leaks, and available records.

Can a pool inspector find underground leaks?

A routine inspection may identify symptoms, but specialized leak detection and pressure testing may be needed to locate hidden plumbing failures.

Repairs and Costs

Can concrete cancer be repaired?

Possibly. The answer depends on the confirmed diagnosis, current damage, expected future expansion, structural condition, water retention, repair design, and whether rebuilding offers a more dependable result.

Does crack injection cure ASR?

Crack injection may seal or strengthen a particular crack, but it does not automatically stop the chemical reaction or future expansion elsewhere in the shell.

Does replastering fix concrete cancer?

No. Replastering replaces the visible interior finish. It does not correct active deterioration or expansion within the concrete shell.

Can waterproofing stop concrete cancer?

Moisture-control measures may help some affected structures, but a swimming pool remains exposed to water by design. Waterproofing should be part of a professionally designed strategy rather than treated as a guaranteed cure.

Does an ASR pool always need to be rebuilt?

No. Some affected pools may be monitored, mitigated, strengthened, or repaired. Replacement becomes more likely when damage, leakage, future expansion, or repair uncertainty is extensive.

How much does concrete-cancer repair cost?

There is no standard price. Cost depends on testing, engineering, structural work, plumbing, electrical work, tile, coping, decking, equipment, permits, restoration, and whether partial or complete reconstruction is necessary.

Can repair costs be estimated from photographs?

Not reliably. Photographs rarely provide enough information to identify the cause, extent of internal damage, remaining expansion, or complete repair scope.

Is the cheapest repair estimate usually the best choice?

Not necessarily. A lower estimate may exclude engineering, permits, structural work, plumbing, decking, restoration, monitoring, or a meaningful warranty.

Insurance, Value, and Financing

Does homeowners insurance cover concrete cancer?

Coverage depends on the policy, cause of loss, timing, exclusions, and evidence. Gradual deterioration, defective materials, construction defects, cracking, seepage, or earth movement may affect coverage.

Can a separate sudden event be covered?

Possibly. A sudden covered event may create a different insurance question from the preexisting ASR condition. The carrier will evaluate the facts and policy language.

Can concrete cancer affect home value?

Yes. Suspected or confirmed ASR can affect buyer demand, marketability, negotiations, appraisal, financing, insurance, and future resale.

Is the value loss equal to the repair cost?

Not necessarily. Buyers may also discount for inconvenience, uncertainty, future disclosure, insurance, financing, project management, and the possibility that the scope will increase.

Can a damaged pool cause a low appraisal?

Yes. The appraiser may consider the property’s current condition, market reaction, usability, repair information, and comparable sales.

Can a lender require pool repairs before closing?

Yes. Requirements may arise when the condition affects safety, soundness, marketability, insurability, appraisal conditions, or loan-program standards.

Can insurance problems stop a home sale?

Yes. A buyer may be unable to satisfy lender requirements or may decide that the available coverage, exclusions, or premium are unacceptable.

Buying and Selling a Home With Pool Damage

Should a buyer automatically walk away from a home with ASR?

No. The buyer should first evaluate the diagnosis, repair scope, cost, warranty, insurance, financing, price, future resale, and personal tolerance for risk.

Can a home with pool damage still be a good purchase?

Yes, when the cause and scope are reasonably clear, the price reflects the condition, the buyer has adequate resources, and the repair or reconstruction plan is credible.

Can a seller sell a home with concrete cancer in the pool?

Yes. The condition may affect disclosure, pricing, negotiations, financing, insurance, and buyer demand, but it does not automatically make the home unsellable.

Does selling a home as is eliminate disclosure concerns?

No. An as-is sale and the seller disclosure process address different parts of the transaction.

Did the Texas REALTORS disclosure form change in 2026?

Yes. Texas REALTORS reported that its revised Seller’s Disclosure Notice, effective June 15, 2026, added Alkali-Silica Reaction, also known as concrete cancer, to Section 3.

Should sellers disclose prior pool repairs?

Prior repairs, inspections, claims, reports, leaks, and known structural concerns may be relevant to the disclosure process. Sellers should answer the actual form accurately based on their knowledge.

Should sellers repair pool problems before listing?

Sometimes. Repairing may help when the cause and scope are clear and the work is likely to improve marketability. Selling in the current condition may be more practical when the scope is uncertain, expensive, or likely to delay the sale.

Can a pool cause a home sale to fall apart?

Yes. Transactions may fail because of unexpected inspection findings, uncertain repair costs, appraisal issues, lender requirements, insurance problems, disclosure conflicts, or unsuccessful negotiations.

Can good maintenance prevent concrete cancer?

Maintenance cannot change reactive materials already inside a concrete shell or guarantee prevention. It can help protect finishes and equipment, identify leaks and movement early, maintain drainage, and preserve useful records.

Maintenance and Next Steps

What pool pH should homeowners maintain?

The Centers for Disease Control and Prevention recommends maintaining pool pH between 7.0 and 7.8. A pool professional may also monitor alkalinity, calcium hardness, stabilizer, and other factors.

Should a pool be drained to inspect the shell?

Do not drain a pool without professional guidance. Draining can create finish and structural risks depending on weather, groundwater, hydrostatic conditions, and pool construction.

What records should a pool owner keep?

Keep construction documents, permits, service records, water tests, repair invoices, leak-detection reports, inspection and engineering reports, warranties, photographs, and insurance or builder correspondence.

What should buyers ask the seller?

Ask about construction date, builder, leaks, cracks, resurfacing, structural repairs, engineering reports, laboratory testing, insurance claims, warranty claims, and transferable warranties.

What should homeowners do after noticing a suspicious crack?

Document the condition, gather records, monitor changes, avoid hiding the evidence with a quick cosmetic repair, and obtain evaluation from an appropriately qualified professional.

What is the most important takeaway?

Concrete cancer should be taken seriously without assuming every crack or newer pool is affected. Decisions should be based on the individual pool’s history, inspection findings, testing, repair options, and complete documentation.

My Bottom Line

Concrete cancer deserves careful attention, but it should not turn every pool crack into a worst-case conclusion. The most useful approach is to separate known facts from assumptions, preserve the pool’s records, complete the right inspections, and involve qualified professionals when the condition moves beyond ordinary maintenance.

Buyers, sellers, and homeowners will make better decisions when they understand not only what the pool looks like today, but also what has been documented, what remains uncertain, and what the proposed repair is expected to accomplish.