Chinese Drywall Litigation: Settlements, New Claims, and Remediation

Chinese drywall litigation was a wave of federal and state lawsuits, consolidated into a multidistrict proceeding in the Eastern District of Louisiana, brought by homeowners whose properties were built or renovated with defective gypsum board imported from China between 2001 and 2009. The imported drywall released sulfur gases that corroded copper wiring and air conditioning coils, produced a rotten-egg smell, and triggered respiratory and other health complaints. The major settlements with Knauf, Taishan, Banner Supply, and the Porter-Blaine/Venture Supply class all reached final approval by January 2020, and no court-ordered compensation programs appear to remain open for new claims. For a homeowner discovering the problem now, the useful questions are whether the drywall can be confirmed, how to remediate it, what insurance will and will not pay, whether a casualty loss deduction is still available, and what must be disclosed on sale.

What the Litigation Was About

The defective drywall released hydrogen sulfide and related sulfur gases at low but persistent levels. Federal studies found hydrogen sulfide concentrations in affected homes often exceeded 0.59 parts per billion, compared to below 0.35 ppb in unaffected homes. Those readings sat below the Agency for Toxic Substance and Disease Registry’s minimum risk threshold of 20 ppb, but ongoing exposure was associated with a consistent pattern of complaints: respiratory irritation, headaches, sinusitis, eye and throat irritation, and fatigue. The characteristic rotten-egg odor was often the first thing homeowners noticed, particularly in tighter new construction.

The property damage was distinctive. Sulfur compounds reacted with copper to form copper sulfide, blackening electrical wiring, corroding air conditioning evaporator coils, and tarnishing silver items. HVAC systems, smoke detectors, and electrical components failed prematurely. The corrosion was not cosmetic; it compromised the conductivity of wiring and the function of safety devices, which is why proper remediation involved far more than swapping out the drywall.

How the Cases Were Consolidated and Resolved

On June 15, 2009, the U.S. Judicial Panel on Multidistrict Litigation transferred all federal Chinese drywall cases into MDL No. 2047 before a single judge in the Eastern District of Louisiana.¹ The two most prominent manufacturer defendants were Knauf Gips KG, whose Chinese subsidiary Knauf Plasterboard Tianjin (KPT) produced much of the defective drywall sold in the United States, and Taishan Gypsum, whose products were linked to corrosion in thousands of homes.² Domestic distributors, including Florida-based Banner Supply Company, were also central defendants.³

The turning point was Hernandez v. Knauf Gips KG, a bellwether trial in which the court entered judgment for the plaintiff family and validated the remediation protocol developed from trial evidence.² After Hernandez, Knauf negotiated a comprehensive settlement program giving homeowners three paths: a Program Contractor Option using Moss & Associates for full remediation; a Self-Remediation Option paying the higher of a bonded contractor’s estimate or 65% of an independent cost estimate; and a Cash-Out Option that paid a lump sum without requiring remediation, reduced by $7.50 per square foot. Residential owners who chose remediation also received moving and storage payments, damaged-appliance payments, and alternative living expenses of $8.50 per square foot for the first three months (for homes up to 3,500 square feet), plus $1.50 per square foot for each additional month. A separate Other Loss Fund reimbursed pre-settlement alternative living expenses and loss of equity from foreclosures or short sales tied to the damage.⁴

The Taishan settlement received final approval on January 10, 2020, after years of jurisdictional resistance from the Chinese manufacturer.⁵ The Allen Settlement, covering Porter-Blaine/Venture Supply claims, was finalized July 18, 2018. Banner Supply reached its own separate settlement.

Can New Claims Still Be Filed?

For someone discovering Chinese drywall in a home for the first time in 2026, the legal picture is grim. Statutes of limitation for property damage claims run from the time the defect was discovered or should have been discovered with reasonable diligence, and most states set that period at four to six years. Given that the problem was widely publicized starting in 2009, courts are unlikely to accept a discovery argument seventeen years later absent extraordinary circumstances. Federal courts have also held that a homeowner cannot extend an expired limitations period by piggybacking on an earlier-filed class action. The productive focus now is identification, remediation, disclosure, and tax treatment.

Confirming Problem Drywall in a Home

The Consumer Product Safety Commission and the Department of Housing and Urban Development published a two-step identification method that remains the standard.⁶

Step One: Visual Inspection

Both conditions must be present before further investigation is warranted: blackened copper electrical wiring or air conditioning evaporator coils, and drywall newly installed (in new construction or renovation) between 2001 and 2009. If either is absent, the home does not meet the federal threshold. Blackening on copper is the most recognizable sign, and it typically appears on grounding wires inside outlets and on central air conditioning evaporator coils.

Step Two: Corroborating Evidence

Homes with drywall installed between 2005 and 2009 need at least two of the following markers. Homes with drywall installed between 2001 and 2004 need at least four:

Lab testing showing elemental sulfur exceeding 10 parts per million in samples taken from the drywall core.
Confirmation that the blackening on copper is copper sulfide, verified through laboratory analysis or test strips placed in the home for two to four weeks.
Stamps or markings on the back of the drywall indicating Chinese manufacture. Not all problem drywall carries visible markings, and not all Chinese-made drywall is defective.
Lab chamber testing of drywall samples showing elevated hydrogen sulfide, carbonyl sulfide, or carbon disulfide.
Induced corrosion in a sealed test chamber, where copper placed alongside the drywall forms copper sulfide.

Four of the five markers require outside laboratory testing, so visual inspection alone cannot fully confirm the problem.

What a Proper Remediation Includes

The CPSC published its Remediation Guidance for Homes with Corrosion from Problem Drywall in March 2013, setting the minimum standard.⁷ The guidance requires replacement of:

All identified problem drywall.
Smoke alarms and carbon monoxide alarms in affected areas.
Electrical distribution components including receptacles, switches, and circuit breakers. Full replacement of cable runs is not required unless the wiring was damaged during removal, but exposed wire ends must be cleaned or cut back to reveal uncorroded copper.
Fusible-type fire sprinkler heads, with glass-bulb sprinkler heads requiring either testing or replacement.

One point often surprises homeowners: the CPSC guidance does not require replacement of HVAC evaporator coils. The agency acknowledged that many remediation efforts included coil replacement but stated there was “an absence of a direct connection to safety” for that component. Many settlement-funded remediations replaced HVAC systems anyway because corrosion had rendered them ineffective.⁸ The Knauf settlement’s own remediation protocol went further, requiring removal and replacement of all drywall, insulation, wiring, affected appliances, and heating and cooling systems.⁹

After removal, the home must be thoroughly cleaned to remove particulate matter and dust, then aired out before rebuilding begins. Inspections are required at multiple stages: after removal of all affected materials, after cleaning and air-out, and after submission of a pre-rebuilding clearance testing report.

Why Homeowners Insurance Will Not Pay

Most affected homeowners discovered their insurance would not cover the damage. The MDL court ruled that the defective drywall constituted “faulty materials” under standard homeowners policies, placing it within the faulty materials exclusion, and that the resulting corrosion was independently excluded under the corrosion exclusion in most policies.¹⁰ Homeowners argued that damage to wiring, HVAC systems, and personal property should count as covered “ensuing losses” even if the drywall itself was excluded. The court rejected that argument, finding the corrosion damage was not different in kind from the excluded loss. The practical effect: homeowners have to rely on manufacturer settlements or their own resources.

Casualty Loss Tax Treatment

The IRS issued special rules under Revenue Procedure 2010-36 allowing homeowners to treat unreimbursed remediation costs as a casualty loss in the year of payment. The procedure applies where the drywall qualifies as “corrosive drywall” under the CPSC/HUD two-step method, and the IRS will not challenge casualty loss treatment if the homeowner follows the procedure and reports the loss on Form 4684.¹¹

The deduction amount depends on the reimbursement posture:

No pending claim: deduct 100% of unreimbursed amounts paid during the tax year to repair damage to the home and household appliances.
Pending or intended reimbursement claim through insurance, litigation, or otherwise: deduct 75% of unreimbursed amounts paid during the tax year. If the eventual reimbursement differs from what was estimated, the difference is trued up as additional income or an additional deduction in the year the reimbursement is finalized.
Already fully reimbursed: no casualty loss deduction is available.

Taxpayers who already filed returns for the year they paid remediation costs generally had three years from the filing date to submit an amended return claiming the deduction.¹² For most affected homeowners, those windows have closed. Anyone who paid unreimbursed remediation costs in the last three years should check whether the amendment window is still open.

Disclosure Obligations When Selling

Homeowners who know their property contains or previously contained Chinese drywall face ongoing disclosure obligations when selling. Every state requires disclosure of known material defects that affect property value, and Chinese drywall qualifies under virtually any formulation of that duty. The obligation applies whether the drywall is still in place or has been fully remediated, because both the exposure history and the scope of any remediation are facts a reasonable buyer would consider material.

The Knauf Cash-Out settlement made this contractual: homeowners who took the cash payment without remediating were required to notify future purchasers about the presence of KPT Chinese drywall.⁴ Even homeowners who fully remediated should disclose the history. Standard seller disclosure forms may not include a specific line for Chinese drywall, but the general “known defects” or “material facts” section applies. Keeping records of the remediation scope, contractor certifications, and post-remediation clearance testing is the best protection against later fraud claims from a buyer who learns the truth.

1
United States District Court Eastern District of Louisiana. Order and Reasons
2
United States District Court Eastern District of Louisiana. MDL 2047 Order and Reasons
3
United States District Court Eastern District of Louisiana. Banner Settlement Preliminary Approval Order
4
United States District Court Eastern District of Louisiana. Knauf Amended Settlement Agreement
5
United States District Court Eastern District of Louisiana. MDL 2047 Chinese-Manufactured Drywall Products Liability Litigation
6
U.S. Consumer Product Safety Commission. How Can I Tell If My Home Has Problem Drywall?
7
U.S. Consumer Product Safety Commission. Interagency Drywall Investigation
8
U.S. Consumer Product Safety Commission. Remediation Guidance for Homes with Corrosion from Problem Drywall
9
GovInfo. MDL 2047 Remediation Protocol
10
United States District Court Eastern District of Louisiana. Order and Reasons – Homeowners Insurance
11
Internal Revenue Service. IRS Publication 547 – Casualties, Disasters, and Thefts
12
Internal Revenue Service. IRS Provides Relief for Homeowners with Corrosive Drywall