GAF Is Being Sued for Antitrust Violations and Contractor Retaliation Here Is What the Lawsuit Alleges

A construction company has taken one of the biggest names in American roofing to court. Heritage Builders LLC filed a lawsuit against GAF — North America’s largest roofing manufacturer — alleging anti-competitive pricing practices, deceptive conduct, and retaliation against contractors who pushed back.

The case is being tracked at GAFLawsuit.com, a dedicated site launched by Heritage Builders to gather information from others who say they experienced similar issues.

Quick Facts

Field	Detail
Plaintiff	Heritage Builders LLC
Defendant	GAF (Building Materials Corporation of America)
Claims Filed	Antitrust, Deceptive Practices, Consumer Fraud, Tortious Interference, Civil Conspiracy, Retaliation
Information Site	GAFLawsuit.com
Case Status	Active — ongoing
Last Updated	May 18, 2026

Who Is GAF?

GAF is North America’s largest roofing manufacturer, producing quality, innovative roofing materials including asphalt shingles, solar roofing, and TPO roofing systems. GAF is a subsidiary of Standard Industries, with headquarters in Parsippany, New Jersey. One in four roofs in the United States is constructed using GAF products.

GAF holds roughly 35–40% market share in the North American roofing materials market. That dominant position is central to the legal claims Heritage Builders is bringing against it.

What Heritage Builders Is Alleging

Heritage Builders filed a lawsuit against GAF for antitrust violations, deceptive practices, consumer fraud, tortious interference, civil conspiracy, retaliation, and more.

The complaint involves allegations related to roofing materials, performance expectations, and representations made in connection with those products. Heritage Builders filed the complaint after identifying issues it believes required legal review.

The claims break down into six distinct legal categories:

Antitrust covers laws designed to promote fair competition and prevent monopolies or unfair business practices that harm consumers or other businesses.

Deceptive Practices refers to business actions that mislead consumers — such as false advertising, hidden fees, or misrepresentation of products or services.

Consumer Fraud involves the use of false or misleading tactics to cheat consumers out of money or property.

Tortious Interference occurs when a third party intentionally disrupts an existing business relationship or contract between two other parties.

Civil Conspiracy is an agreement between two or more parties to commit an unlawful act, or a lawful act in an unlawful way, resulting in harm to another person or business.

Retaliation means taking adverse action against someone for engaging in a legally protected activity — such as reporting misconduct or filing a complaint.

Why GAF’s Market Position Matters Here

Antitrust law in the United States — primarily the Sherman Antitrust Act (15 U.S.C. § 1 and § 2) and the Clayton Act (15 U.S.C. § 15) — prohibits companies from using market dominance to suppress competition, fix prices, or punish businesses that refuse to play along.

GAF’s contractor certification program requires certified contractors to use a minimum amount of GAF products to qualify for enhanced warranties — and only certified contractors can offer GAF’s enhanced warranty products to homeowners. Critics argue this structure can effectively lock contractors into purchasing GAF materials and limit their ability to offer competing brands without losing warranty access.

When a company holds 35–40% of a market and controls which contractors can access its top-tier warranty products, antitrust claims about pricing and retaliation become more legally viable than they would be for a smaller player.

For a broader understanding of how antitrust law works in practice, see our coverage of the Ticketmaster antitrust class action lawsuit, where similar market dominance and pricing claims are at the center of the case.

GAFLawsuit.com — What the Investigation Site Is Asking

Heritage Builders launched GAFLawsuit.com as a public information hub for the case. The site serves as a centralized source for updates and context surrounding the case, and invites contractors, property owners, and others who have experienced similar issues with GAF to come forward with information.

The matter may be relevant to contractors, property owners, and others who rely on roofing materials and manufacturer representations in their projects.

If you are a contractor who believes you were penalized, decertified, or otherwise harmed for raising concerns about GAF’s pricing or products, the site at GAFLawsuit.com has a contact form to submit your information.

What Contractors and Homeowners Should Know

Contractors who participate in GAF’s certification programs and depend on GAF warranties for their customers are most directly affected. If the allegations of retaliation are proven, contractors who faced decertification or loss of business after raising complaints may have legal grounds to participate in this action.

Homeowners are affected indirectly. Anti-competitive pricing at the manufacturer level typically flows downstream — meaning contractors pay more, and those costs land on the homeowner’s final invoice.

This case is still in early stages. No settlement has been reached, and GAF has not publicly responded to the specific complaint allegations at this time.

For context on how antitrust enforcement affects everyday consumers through business-level pricing disputes, see our coverage of the Nexstar-Tegna antitrust merger lawsuit, where pricing harm to end users is a central argument.

Frequently Asked Questions

What laws cover the claims in this lawsuit?

 The primary federal laws at issue are the Sherman Antitrust Act (15 U.S.C. §§ 1–2), which prohibits anti-competitive agreements and monopolization, and the Clayton Act (15 U.S.C. § 15), which allows injured businesses and consumers to sue for treble damages. State consumer fraud statutes may also apply depending on where the conduct occurred.

Is this a class action lawsuit? 

Based on available information, this is a lawsuit filed by Heritage Builders LLC against GAF. The GAFLawsuit.com site is actively seeking others with similar experiences, which suggests the case could expand or lead to additional claims.

Can I participate if I am a contractor who had a similar experience with GAF?

 Heritage Builders is asking contractors, property owners, and others who experienced similar issues to submit information at GAFLawsuit.com. Submitting information is not the same as filing a legal claim, but it can help attorneys assess whether additional plaintiffs may be involved.

Does filing a complaint at GAFLawsuit.com cost anything? 

The site functions as an information-gathering platform. Consulting with an attorney about your specific situation is always recommended before taking any legal step.

What happens if GAF is found liable?

 Under the Clayton Act, successful antitrust plaintiffs may recover triple their actual damages, plus attorney fees and court costs. Exact remedies depend on what claims survive and what the court or a jury ultimately decides.

Sources

• GAFLawsuit.com — Heritage Builders vs. GAF official case site
• GAF.com — contractor certification program details
• Sherman Antitrust Act, 15 U.S.C. §§ 1–2 — Cornell Law LII
• Clayton Act, 15 U.S.C. § 15 — Cornell Law LII
• FTC — Antitrust Laws: A Brief History

Prepared by the AllAboutLawyer.com Editorial Team and reviewed for factual accuracy against official legal sources on May 18, 2026. Last Updated: May 18, 2026

Disclaimer: This article is for general informational and educational purposes only and does not constitute legal advice. Laws vary by state and jurisdiction. For advice about your specific situation, consult a qualified attorney.