FTC Home Insulation R-Value Rule — Labeling and Advertising Requirements

The FTC's Labeling and Advertising of Home Insulation rule — 16 CFR Part 460 — requires insulation manufacturers, retailers, installers, and new home sellers to provide standardized R-value disclosures so consumers can make apples-to-apples comparisons between insulation products. R-value measures thermal resistance — how well insulation resists heat flow. The higher the R-value, the better the insulating performance per inch of thickness. Without uniform testing and disclosure standards, manufacturers could cherry-pick thickness or temperature conditions to claim misleading R-values. The rule requires R-values to be based on specified ASTM test methods, prohibits "R-value per inch" claims (which can obscure installed thickness requirements), mandates labels on insulation packages, requires fact sheets from manufacturers, and obligates new home sellers to disclose insulation type, thickness, and R-value in every sales contract. Violating any provision is an unfair or deceptive act under the FTC Act — civil penalties apply.

Current Rule (2026)

What This Rule Does

16 CFR Part 460 applies whenever any covered person imports, manufactures, distributes, sells, installs, promotes, or labels home insulation. Home insulation is any material primarily used to slow heat flow in residential structures — fiberglass batts, cellulose loose-fill, mineral wool, closed-cell and open-cell spray polyurethane foam, rigid foam boards, and reflective/radiant barrier products all fall within scope. The rule does not distinguish between products sold in retail stores, installed by contractors, or used by builders in new construction.

The rule operates through a chain of disclosure obligations:

1. Manufacturers test products to ASTM standards, create labels for every package, and supply fact sheets to retailers and installers
2. Retailers make fact sheets available to do-it-yourself customers before purchase
3. Installers show customers fact sheets before purchase commitment and provide written contracts specifying installed R-value
4. New home sellers must include insulation specifications in every purchase contract

Key Provisions

• § 460.5 — R-value testing: all R-value claims in labels, fact sheets, and advertising must be based on tests under specified ASTM methods. The primary test standard is ASTM C518 (heat flow meter apparatus) for most insulation types. Reflective insulation is tested under ASTM C1363 or ASTM C1224. Results must represent a "representative thickness" — testing at the thinnest commercially sold thickness for each product line.
• § 460.8 — R-value tolerances: manufacturers must ensure that no individual specimen of any insulation product has an R-value more than 10% below the R-value claimed on the label, fact sheet, or advertisement. Non-manufacturer sellers must ensure they don't claim R-values that exceed what the manufacturer certified by more than 10%. This is a strict product quality standard — batch testing and quality control are necessary to comply.
• § 460.11 — Rounding: R-values must be rounded to the nearest tenth (e.g., R-13.1 not R-13.12). R-values of 10 or more may be rounded to the nearest whole number (e.g., R-19 not R-19.4).
• § 460.12 — Package labels: every package of home insulation sold by a manufacturer must include a label showing: (a) the type of insulation (fiberglass batt, cellulose, etc.); (b) a chart specifying the R-value, length, width, thickness, and square footage per package (for batts and blankets); or (c) for loose-fill, the maximum net coverage area at specified R-values, minimum weight per square foot, and minimum settled thickness — the information necessary for an installer to know how much product to purchase.
• § 460.13 — Manufacturer fact sheets: manufacturers must provide fact sheets to every retailer and installer covering each product. Each fact sheet must state the type of insulation, a coverage table (same information as the package label), and the settled thickness and density for loose-fill. Fact sheets must be kept available at the point of sale.
• § 460.14 — Retailer obligations: retailers selling to do-it-yourself customers must have fact sheets for every insulation product they sell and make them available at the point of sale (online retailers must make fact sheets available on their website for every product before purchase).
• § 460.15 — Installer obligations: installers must show customers the relevant fact sheet before customers agree to purchase and provide it before work begins. The installer may not commit the customer to insulation without showing them the specification.
• § 460.16 — New home seller obligations: every residential new home sales contract must specify the type, thickness, and R-value of the insulation that will be installed in each part of the house — attic, walls, crawlspace, floors, basement, etc. If a buyer agrees to substitute different insulation before installation, a new written disclosure is required. Builders may not promise R-values verbally without documenting them in the purchase contract.
• § 460.17 — Installer contracts: installers must provide a written receipt specifying the coverage area, thickness, and R-value of all insulation installed. For loose-fill insulation, the contract must also show the weight of material installed per square foot and the initial settled thickness.
• § 460.18 — Advertising requirements: any advertisement that mentions an R-value must also state the type of insulation and the thickness required to achieve that R-value. Ads mentioning R-values must also include the statement: "The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-values." This disclosure requirement applies to all advertising media.
• § 460.19 — Energy savings claims: if any marketing material claims or implies that insulation will cut fuel bills, reduce energy use, or provide energy savings, the claim must have a reasonable basis — typically, supporting test data or engineering calculations. Unqualified savings claims ("reduces heating bills by 40%") without substantiation are deceptive.
• § 460.20 — R-value per inch prohibition: sellers may not advertise or label the "R-value per inch" or "R-value for one inch" of their product. This prohibition prevents manufacturers from using a high-density inch to advertise a favorable per-inch comparison while selling a product installed at lower density. There are two exceptions: (1) compliance with an existing FTC cease-and-desist order that expressly permits the claim; (2) the product is sold exclusively in cut-to-order configurations, not in specific thicknesses.
• § 460.21 — Government endorsement prohibition: sellers may not claim that a government agency certifies, recommends, or endorses their insulation product unless it is true. "Government-approved R-value" or "meets federal standards" claims require actual certification from the relevant agency.
• § 460.22 — Non-insulation product R-value claims: if a product that is NOT home insulation (e.g., an interior paint additive, window film, or structural panel) makes an R-value claim to reduce residential energy use, it must be tested under the applicable ASTM method and meet the same substantiation standard. This provision captures spray-on additives, radiant barriers marketed as wall treatments, and similar products that try to use R-value language without meeting insulation testing standards.
• § 460.23 — Tax benefit claims: sellers may not claim their product qualifies for a tax credit or deduction (e.g., the § 25C energy efficiency credit) unless it actually qualifies. The § 25C insulation credit requires meeting specific R-value thresholds set by the IRS — sellers who claim their product qualifies must verify the specific threshold applies.

How It Affects You

Statutory Authority

This rule implements:

• 15 U.S.C. § 41 et seq. — FTC Act: prohibits unfair or deceptive acts or practices in commerce; authorizes the Commission to promulgate trade regulation rules with the force of law; civil penalties of up to $51,744 per violation apply when rules are violated

Recent Developments

• § 25C energy efficiency credit expansion (IRA 2022): The Inflation Reduction Act significantly expanded the IRC § 25C energy efficiency credit for home insulation. Homeowners can claim up to $1,200/year for qualifying insulation materials. The FTC rule's § 460.23 prohibition on false tax benefit claims has become more relevant as sellers market insulation products specifically for their credit eligibility. Qualifying insulation must meet or exceed IECC-specified R-values for the applicable climate zone. Sellers making tax credit claims should verify the specific R-value threshold in IRS guidance.
• Spray polyurethane foam growth and testing controversy: Closed-cell spray polyurethane foam (SPF) — which achieves R-6 to R-7 per inch — has grown rapidly in new construction. R-value claims for SPF must be based on ASTM C518 testing. The EPA has also issued chemical safety guidance on off-gassing during application under the TSCA framework; SPF manufacturers must navigate both FTC R-value labeling rules and EPA chemical safety requirements.
• Reflective insulation and radiant barriers: Radiant barriers (reflective foil products) have challenged traditional R-value methodology — their performance depends significantly on airspace and installation configuration, not just material properties. The FTC Part 460 requires testing under ASTM C1363 or C1224 for reflective products, and prohibits R-value claims for radiant barriers unless tested under these standards. The FTC has taken action against sellers of attic foil products making unsupported R-value claims.
• Trump FTC and § 25C IRA credit status (2025): The Trump FTC under chair Andrew Ferguson has focused on content moderation and Big Tech enforcement rather than consumer product rule modernization. FTC Part 460 (R-value rule) is not a target for rollback — it is a straightforward consumer disclosure rule with broad industry support that predates the IRA. However, the IRA's § 25C energy efficiency credit expansion — which drove consumer demand for qualifying insulation — is at risk in OBBBA reconciliation. If the § 25C annual credit cap ($1,200 for insulation, windows, and other efficiency measures) is reduced or eliminated in OBBBA, seller marketing emphasizing tax credit eligibility would become misleading under FTC § 460.23. Insulation retailers should track § 25C status in reconciliation proceedings.

Pending Action

(Left for wiki-enrich — FTC modernization of Part 460 to address new insulation technologies and online retail.)