2001–2009
Imported material enters homes
Homes were constructed or renovated during a period of building demand and material shortages.
Florida Real Estate Contract Guide
Addendum M: Defective Drywall
A building-material shortage introduced defective drywall into thousands of American homes. Florida Addendum M helps buyers and sellers address the property’s history, inspection rights, known records, resulting damage, and the buyer’s ability to cancel.
The short explanation
What does Addendum M do?
Plain English
Addendum M gives the seller a dedicated place to disclose actual knowledge, reports, records, or other documents involving defective drywall. It then allows the buyer either to waive a specialized drywall inspection or select an inspection period with a contractual path to cancel if defective drywall or related damage is found.
Why this form exists
The defective-drywall crisis
The rider is a direct response to a real construction crisis. During the mid-2000s building boom—and after hurricanes increased demand for replacement materials—domestic drywall supplies became strained. Imported drywall entered rapidly growing states such as Florida. Complaints later connected some of that material with noxious odors, metal corrosion, equipment damage, and reported respiratory irritation.
Late 2008
Complaints reach regulators
The U.S. Consumer Product Safety Commission began receiving complaints involving odors, corrosion, and reported health effects.
2009–2010
Federal investigations expand
Agencies studied indoor air, drywall samples, metal corrosion, and conditions inside affected homes.
Today
The history still follows the property
Older reports, repairs, replacements, claims, or incomplete remediation can remain important during a future resale.
“Chinese drywall” and “defective drywall” are related terms, but not identical.
Much of the crisis involved imported drywall manufactured in China. Addendum M uses the broader term “Defective Drywall” because the central transaction issue is whether material in the property emits problematic compounds or has caused related damage—not simply the country printed on the back of a drywall panel.
What homeowners experienced
The problem went beyond the walls
Defective drywall could affect systems throughout a home. That is why replacing a visibly damaged appliance—or covering an odor—would not necessarily answer whether the drywall or resulting corrosion had been fully addressed.
Metal corrosion
Complaints included blackening and corrosion of copper tubing, electrical components, wiring, and other household metals.
Mechanical damage
Air-conditioning and refrigerator coils were among the components reportedly affected by corrosive conditions.
Persistent odors
Homeowners reported strong and unpleasant sulfur-like odors inside affected homes.
Reported irritation
Federal investigations documented reports involving eyes, skin, breathing, headaches, and upper-respiratory irritation.
Broad remediation
Addressing the problem could involve far more than replacing drywall because corrosion may extend to building systems.
Future resale questions
Buyers may reasonably ask what was found, what was removed, who performed the work, and whether supporting records remain.
Documented Florida case study
Seifart v. Banner Supply
$2.47M
Approximate jury verdict
A construction product became a whole-house problem
In 2010, a Miami-Dade jury considered claims arising from defective drywall installed in Armin and Lisa Seifart’s Florida home. The jury found that the drywall was defective and returned a verdict totaling approximately $2.47 million.
The case was brought against Banner Supply, a drywall distributor. It was a product-liability case—not a lawsuit accusing a residential seller of failing to make a real estate disclosure.
View the court’s verdict form →
Why it matters to a later home sale:
The verdict illustrates that defective drywall can create damage far
beyond the cost of a few wall panels. If a seller knows that a home
was inspected, affected, repaired, remediated, or involved in a
related claim, those facts and records could be highly significant to
a buyer evaluating the property.
The disclosure lesson
Why known drywall history should not disappear at resale
Florida’s general disclosure rule
When a residential seller knows of facts materially affecting the property’s value that are not readily observable and are not known to the buyer, Florida law generally requires disclosure.
Johnson v. Davis
The landmark Florida Supreme Court case involved serious roof problems rather than defective drywall. Its importance is the broader rule it established for known, hidden, material property conditions.
Applied to defective drywall, the lesson is straightforward: a seller should not assume that an “AS IS” contract turns known reports, prior remediation, corrosion, claims, or defective building materials into irrelevant history.
Read Johnson v. Davis →Inside Addendum M
Four parts of the defective-drywall rider
01
Seller’s actual knowledge
The seller identifies known defective-drywall information and lists available records, reports, or documents affecting the property.
02
Buyer’s inspection choice
The buyer either waives the opportunity to conduct a specialized assessment or selects the contractual inspection option.
03
Cancellation deadline
When the inspection option is selected, the buyer must inspect and deliver any cancellation notice within the period stated in the current rider.
04
Professional reliance
The rider explains that the broker has not independently verified the drywall condition. The buyer relies on inspections, professionals, agencies, and other retained experts.
Always read the version attached to the actual contract.
Form language, default selections, deadlines, and cancellation procedures can change between revisions. The signed rider—not a website summary or an older copy—controls the parties’ contractual rights.
Seller documentation
Disclosure is more than checking a box
When a seller has actual knowledge of a drywall concern, the most useful disclosure often includes the history and supporting documents, not merely a one-word answer.
Inspection and laboratory reports
Preserve professional assessments, photographs, sample results, correspondence, and any written conclusions concerning the drywall.
Remediation scope
Identify what material was removed, which building systems were examined or replaced, and whether the work addressed resulting corrosion.
Permits and contractor records
Retain permits, invoices, contracts, licenses, warranties, completion documents, and final inspections related to the work.
Claims and litigation
Insurance claims, builder claims, settlements, warranties, or lawsuits involving defective products may remain material to a future buyer.
Buyer’s election
Waive the inspection—or preserve the right to investigate
Option A
Waive the specialized inspection
- The buyer gives up the opportunity provided by the rider.
- The drywall is accepted in its existing condition.
- The buyer should understand the effect before selecting this option.
- A general inspection may not answer every defective-drywall question.
Option B
Conduct an inspection or risk assessment
- The inspection is performed at the buyer’s expense.
- The rider establishes a specific Drywall Inspection Period.
- The buyer may obtain help from an appropriate qualified professional.
- Cancellation must follow the rider’s written-notice requirements.
- The buyer is responsible for inspection-related property damage.
Frequently asked questions
Florida Addendum M FAQ
Is all drywall manufactured in China defective?
No. Country of origin alone does not establish that drywall is defective. The relevant questions concern the particular material installed, professional findings, reported emissions, resulting corrosion, and the property’s documented history.
What must a seller disclose in Addendum M?
The rider provides space for the seller to describe actual knowledge concerning defective drywall and identify available information, reports, records, or other documents affecting the property.
Can a buyer inspect specifically for defective drywall?
Yes, when the inspection option is selected. The current rider should be reviewed carefully for the applicable deadline, required notice, default selection, and cancellation procedure.
Can a buyer cancel if defective drywall is discovered?
The inspection option may provide a cancellation right when the buyer obtains the permitted inspection and delivers timely written notice as required by the rider. Missing the deadline can eliminate that particular contractual cancellation right.
Does an AS IS contract eliminate the seller’s disclosure duty?
An AS IS contract should not be treated as permission to conceal a known, hidden condition that materially affects property value. Sellers should obtain legal advice when uncertain about a particular disclosure.
Does replacing the drywall end the disclosure issue?
Not necessarily. Buyers may need to evaluate what was removed, whether affected wiring, tubing, coils, or other components were addressed, who performed the work, and what documentation exists.
Can a real estate agent determine whether drywall is defective?
A real estate agent is not a substitute for a qualified inspector, licensed contractor, environmental professional, attorney, or governmental agency. Addendum M specifically addresses the buyer’s reliance on appropriate third parties.
Primary resources
Learn more about defective drywall
Understand Before You Sign
A repaired wall may have a much longer history.
DW&Co. helps Central Florida buyers and sellers ask better questions, preserve transaction records, and coordinate specialized concerns with qualified inspectors, contractors, closing professionals, and Florida real estate attorneys.
Connect With DW&Co.This page is provided for general educational purposes and is not legal, medical, environmental, engineering, inspection, or contracting advice. Contract forms and requirements may be revised. Buyers and sellers should review the form used in their transaction and consult qualified Florida legal and technical professionals regarding their specific property.