Gypsum Product Manufacturing (U.S.) — NAICS 327420

An investor's primer. NAICS (North American Industry Classification System) code 327420 covers U.S. factories that turn gypsum rock into finished building products — above all the drywall panels that line the walls and ceilings of nearly every American building.

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1. Overview

Gypsum is a soft, chalky mineral (calcium sulfate). Heat it, grind it, mix it with water and sandwich the paste between two sheets of paper, and you get wallboard — the "drywall," "gypsum board," "plasterboard," or "Sheetrock" that forms the interior surfaces of roughly 90%+ of U.S. homes and most commercial buildings [4][6]. This industry is the factory step: it buys gypsum (mined or recovered from power plants), calcines and forms it into panels, plaster, and joint compounds, and ships them to builders and dealers.

Why an investor should care: drywall is a near-universal, low-tech, hard-to-substitute building material with no serious rival for the job. That gives the makers durable demand and — because the product is heavy and cheap per square foot — strong regional pricing power. The catch is cyclicality: volumes rise and fall with housing starts, remodeling, and commercial construction. It is a classic commodity manufacturing business, where profit is driven by capacity utilization, price discipline, and input costs (gypsum, paper, and energy) rather than brand.

• Public-market route: narrow. Eagle Materials (NYSE: EXP) is the only U.S.-listed company with large, direct wallboard exposure, and even it is mostly a cement company [9]. France's Saint-Gobain (owner of CertainTeed) is public in Paris. That's essentially the list.
• Private route: this is where most of the industry lives. The U.S. leader (USG) is owned by Germany's privately held Knauf; National Gypsum, Georgia-Pacific Gypsum (Koch Industries), and PABCO are all private. Private investors typically get exposure through building-products private equity, distributors, or the gypsum-mining/aggregates side rather than the panel plants themselves.

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2. What it is and how it's structured

In scope (NAICS 327420): manufacturing gypsum products — wallboard/panels, gypsum plasters and plasterboard, gypsum block, joint compound, architectural and ornamental plasterwork, and gypsum-based tile and ceiling products.

What it excludes (and where those activities sit):

• Mining or quarrying gypsum rock → NAICS 212390, Other Nonmetallic Mineral Mining and Quarrying. Federal manufacturing statistics for 327420 therefore capture the plants, not the mines — an important seam, because the same companies often do both and the U.S. Geological Survey (USGS) tracks the mining side separately [4][5].
• Cement → 327310; lime → 327410; ready-mix concrete → 327320; concrete block/products → 327331–327390.
• Installing drywall on a job site → specialty-trade contracting (NAICS 238310, Drywall and Insulation Contractors), not manufacturing.

The manufacturing process. Gypsum rock — or chemically equivalent synthetic gypsum — is crushed and ground, heated (calcined) to drive off part of the bound water and create "stucco," then remixed with water, foam, and performance additives. The slurry is deposited between paper or fiberglass facings, allowed to set as the gypsum rehydrates, cut, dried, and finished. The heating and drying stages make natural gas and electricity important inputs [16]. Plants produce commodity wallboard as well as differentiated fire-resistant, moisture- and mold-resistant, abuse-resistant, exterior sheathing, lightweight, and acoustic panels.

Ownership mix. This is a concentrated, capital-intensive industry of a handful of large producers, most of them either foreign-owned or family/founder-controlled and private. It is not a fragmented trade dominated by tiny operators, and it is not government-run — so federal business statistics capture it well (unlike, say, farming or home health). The main producers are the eight "regular members" of the Gypsum Association: United States Gypsum (USG), National Gypsum, Georgia-Pacific Gypsum, CertainTeed Gypsum, American Gypsum (Eagle Materials), PABCO Gypsum, plus the Canadian affiliates CGC and CertainTeed Canada [14]. Eagle Materials counts six U.S. manufacturers operating 59 wallboard plants and 69 production lines [9].

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3. How big it is

Federal statistics for NAICS 327420 (the manufacturing plants):

Two things stand out. First, this is a small-headcount, high-output industry: about 11,500 workers across ~172 plants produce roughly $9 billion of product — a sign of automated, capital-heavy manufacturing. Second, it is highly concentrated (see Section 8): the top four firms account for 84.1% of revenue [2].

The mining/production picture (USGS, complementary to the Census plant data). In 2025 the U.S. mined about 20 million tons of crude gypsum worth ~$260 million, down from 22 million tons in 2024 [5][4]. Total U.S. gypsum consumption ran about 44 million tons, with wallboard, cement, and agriculture the main uses [5]. U.S. wallboard sales were approximately 25–26 billion square feet in 2025 (estimates range from 25.4 BSF per the Gypsum Association to 26 BSF per USGS, depending on coverage and timing conventions), down from ~28 billion in 2024, against panel-making capacity of roughly 33–34 billion square feet per year — i.e., plants ran well below full capacity [4][5][9]. Manufacturing scrap recycled on-site runs approximately 700,000 tons annually; post-construction and demolition recycling also occurs but is not quantified [5].

A note on market-size figures. Private research firms quote a much larger "U.S. gypsum board market" — commonly $12–16 billion [6][7]. Those numbers bundle in distribution margins, related products, and sometimes installation, so they run above the ~$9 billion of factory-gate shipments the Census measures for 327420. Treat the federal figure as the ground truth for the manufacturing industry itself, and the market-research totals as broader, definition-dependent estimates.

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4. The investable universe

Public exposure is genuinely scarce — most of the industry is private or foreign-owned. The practical universe:

Takeaways for investors:

• There is no clean U.S. "drywall stock." Eagle Materials (EXP) is the closest, but wallboard/recycled-paperboard ("Light Materials") is under half of its ~$2.3 billion of revenue — the rest is cement and aggregates [9].
• Saint-Gobain (Paris-listed, U.S. OTC ticker CODYY) gives diversified exposure through CertainTeed, but drywall is a small slice of a giant global materials group.
• Knauf, National Gypsum, Georgia-Pacific, PABCO are not investable in public markets at all. Private and institutional investors reach the theme through building-products buyouts, the gypsum-mining/aggregates layer, or the distribution channel (see Section 10).

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5. How the money works

Wallboard economics are the economics of a regional commodity with a freight moat.

Revenue = volume × price. Volume is measured in square feet (MSF = thousand square feet; BSF = billion square feet); price is quoted per MSF. Eagle Materials' American Gypsum illustrates the model: in fiscal 2026 it sold about 2.76 billion square feet of wallboard at an average net price of $226.08 per thousand square feet (plus freight of $51.00/MSF), and its wallboard segment earned $286.8 million of operating profit on $764.5 million of revenue — roughly a 38% segment operating margin, down from 41% the prior year as volumes and prices softened [17]. Those are unusually fat margins for a building material, and they come from the industry's structure, not from brand premiums.

Why margins can be high — the freight moat. A drywall panel is heavy and cheap per square foot, so shipping it far destroys the economics. Delivery is predominantly by truck — less than 5% of Eagle's volume moves by rail [17]. Plants therefore serve a radius of a few hundred miles, and each region ends up supplied by only a few producers. That regional concentration, plus disciplined operators, gives pricing power when demand is firm — and is exactly why volumes and prices can hold up even when one input or another moves.

The cost stack the owner watches:

• Gypsum feedstock. Either natural rock (mined) or synthetic gypsum recovered from the flue-gas desulfurization ("FGD") scrubbers of coal-fired power plants. Synthetic gypsum was about 34% of U.S. supply in 2024, but that share is shrinking as coal plants retire — a structural cost issue (Section 9) [5].
• Paper facing. The two paper sheets on each panel, representing approximately one-third of wallboard production cost [9]. The paper is primarily made from recovered old corrugated containers, exposing costs to domestic and export demand for recycled fiber. Vertically integrated players (Eagle runs its own recycled-paperboard mills) protect margin here [9].
• Energy. Calcining — heating gypsum to drive off water — is energy-intensive, so natural-gas prices swing costs directly. Natural gas represented approximately 8–10% of Eagle's wallboard production cost in recent fiscal years [9][17].
• Freight. Both inbound (gypsum, paper) and outbound (finished panels) — heavy, fuel-sensitive. Eagle cited freight of ~$51 per thousand square feet in fiscal 2026 [17].

The operating lever is capacity utilization — but less than it might seem. Eagle states that fixed costs are less than 20% of overall wallboard cost, so utilization changes have a relatively minor effect on unit production cost [18]. However, volume still matters materially to total profit and, more importantly, to regional pricing discipline: excess supply need not raise unit cost dramatically to pressure realized prices. With industry capacity ~34 BSF and sales ~26 BSF in 2025, utilization was roughly three-quarters [4][5] — enough to keep pricing firm, but with slack that would pressure prices in a deeper downturn. Owners also integrate backward into gypsum reserves (USG's new Michigan quarry; Eagle's Oklahoma reserves) to lock in low-cost feedstock [9].

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6. What drives demand

Wallboard demand tracks construction and renovation activity, split across three end-markets. Eagle estimates that residential construction plus repair and remodeling accounted for more than 80% of calendar-2025 U.S. wallboard sales [17]:

1. New residential construction — the swing factor. In a normal year this is roughly 40% of demand; it rises and falls with housing starts, which in turn track mortgage rates, affordability, and household formation [8]. New single-family homes use a lot of board.
2. Repair and remodel (R&R) — the ballast. Often 35–50% of demand; more stable than new construction because it tracks the large installed base of homes, home-price/equity levels, and existing-home turnover. Less interest-rate-sensitive than home purchases but not recession-proof — large discretionary projects react to consumer confidence, home turnover, and home equity.
3. Nonresidential/commercial — offices, schools, hospitals, retail, warehouses, data centers; roughly 15–20% depending on the cycle, and more geared to fire-rated and specialty board.

Because these three don't peak together, total demand is steadier than housing starts alone — but it is still cyclical. The U.S. saw this in 2024–25, when gypsum demand fell as housing completions dropped sharply from post-pandemic highs [8], and wallboard sales slipped from ~28 BSF (2024) to ~26 BSF (2025) [4][5]. The immediate cycle remains soft: U.S. housing starts in May 2026 were at a seasonally adjusted annual rate of 1.177 million units, 8.7% below the May 2025 rate [19]. Forward-looking, the demand case rests on a long-run U.S. housing shortage, an aging housing stock feeding R&R, and nonresidential categories like data centers — set against interest-rate sensitivity in the near term.

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7. Regulation

• Building and fire codes are demand-shaping, not just compliance: code requirements for fire resistance (e.g., "Type X" fire-rated board), sound control, mold/moisture resistance, and impact resistance push builders toward higher-spec, higher-margin panels.
• Environmental permitting. Calcining kilns and dryers emit air pollutants, so plants carry Clean Air Act permits. Relevant requirements include mine permits and reclamation; particulate, ozone-precursor, and combustion emissions; stormwater and process-water controls under the Clean Water Act; and remediation obligations under CERCLA and state analogues [16]. Tighter particulate standards, carbon pricing, or plant nonattainment designations could increase capital and operating costs.
• Coal Combustion Residuals (CCR). EPA's CCR rules govern the FGD gypsum stream from power plants — the supply of a key raw material is tied to power-sector regulation and coal-plant economics. EPA currently excludes beneficial encapsulated reuse (such as wallboard) from federal CCR disposal regulation, but utility compliance costs, impoundment closures, and plant retirements can still alter supply [20].
• Antitrust scrutiny. Given how concentrated the industry is, pricing conduct draws attention. In In re: Domestic Drywall Antitrust Litigation (MDL No. 2437, E.D. Pa.), major producers — USG, National Gypsum, CertainTeed, Eagle/American Gypsum, PABCO, Lafarge, and others — were sued over alleged 2011–2012 wallboard price-fixing; several settled (USG for ~$48 million across direct and indirect purchaser classes) without admitting liability [15]. It is a standing reminder that concentration plus synchronized price increases invites litigation and regulatory interest.
• Trade. The U.S. imports gypsum rock and some finished board; tariffs and trade actions can move input costs. (See import mix in Section 9.) The mid-2000s "Chinese drywall" defect episode also left a legacy of stricter product-quality expectations.
• Emerging: embodied carbon. Low-carbon building standards are beginning to reward lower-CO₂ wallboard (e.g., Saint-Gobain's low-carbon board initiatives), a forward regulatory and procurement trend rather than a current constraint.

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8. Competitive dynamics and consolidation

This is one of the more concentrated manufacturing industries the Census tracks:

• Top 4 firms = 84.1% of revenue; top 8 = 96.1%; top 20 = 98.8% [2].
• Herfindahl-Hirschman Index (HHI) = 1,934 [2] — just under the 2,500 line the antitrust agencies treat as "highly concentrated," i.e., firmly in moderately-to-highly concentrated territory.

In plain terms: a half-dozen producers supply almost the entire U.S. market, and within any given region the effective choice is often two or three. The freight moat (Section 5) reinforces this — national share understates how tight local competition can be.

Consolidation has intensified. Two landmark deals reshaped the industry:

• Knauf acquired USG for ~$7 billion in 2019, taking the historic U.S. leader (Sheetrock) private under a German family-owned parent and combining the world's #2 and #3 producers [10].
• Saint-Gobain (CertainTeed) acquired Continental Building Products for ~$1.4 billion in 2020, folding a top-five North American producer into the French group [11].

The result is a mature oligopoly of large, deep-pocketed owners — most of them private or foreign — competing on cost position (reserves, energy, freight), plant network, and product mix rather than price wars, at least when demand cooperates.

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9. Risks

• Housing cyclicality / rate sensitivity. The biggest swing factor is new-home construction, which is highly sensitive to mortgage rates and affordability. A construction downturn hits volumes and, via utilization, margins — as the 2024–25 volume decline showed [8][5].
• Shrinking synthetic-gypsum supply. Coal-plant retirements are drying up FGD gypsum (down to ~34% of supply and falling) [5]. Coal retirements slowed recently — 2.6 gigawatts retired during 2025 — but the longer-run power-generation shift makes synthetic-gypsum sourcing less predictable [21]. Producers must replace it with mined natural gypsum — reopening quarries (USG's Avery Quarry in Michigan) or importing — which raises feedstock and freight costs and can tighten supply [4].
• Import dependence for rock. Net import reliance was ~15% of consumption in 2025, with crude-gypsum imports mainly from Spain (~38%), Mexico (~30%), and Canada (~28%) over 2021–24 [5]. Trade friction or tariffs on those flows raise costs.
• Energy price volatility. Natural-gas-intensive calcining means gas spikes squeeze margins [9].
• Overcapacity risk. With utilization around three-quarters, a demand shock could turn the industry's fixed-cost structure against it, pressuring prices [4][5].
• Antitrust and litigation exposure. High concentration keeps pricing conduct under a microscope [15].
• Customer concentration. Eagle reported that three customers represented approximately 64% of its fiscal-2026 wallboard segment sales [17]. Distribution has consolidated further: Home Depot completed its acquisition of GMS, while Lowe's completed its $8.8 billion acquisition of Foundation Building Materials in October 2025 [22][23]. Larger distributors can offer dependable volume but also gain purchasing leverage and increase the consequence of losing an account.
• Concentrated end-market and input exposure overall: a business geared to one construction cycle, a handful of raw materials, and freight economics.

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10. How to invest, and the outlook

Public-market routes (limited):

• Eagle Materials (NYSE: EXP) — the only U.S.-listed name with material, direct wallboard economics (American Gypsum), though it is majority cement/aggregates. It offers a liquid, if diluted, way to own the theme, with the wallboard segment's ~38% operating margins a meaningful profit contributor [17].
• Saint-Gobain (Euronext Paris: SGO; U.S. OTC: CODYY) — diversified global materials group that owns CertainTeed drywall; drywall is a small part of the story.
• There is no pure-play U.S. drywall stock — a structural fact worth stating plainly. Investors wanting concentrated exposure will not find it in public equity.

Private / other routes (where most of the industry actually is):

• Building-products private equity and direct/family ownership — the leaders (Knauf/USG, National Gypsum, Georgia-Pacific, PABCO) are private; exposure comes through PE building-materials strategies or, occasionally, as pieces of larger platform deals.
• The mining/aggregates layer — gypsum quarrying (NAICS 212390) and industrial-minerals producers offer an adjacent, feedstock-side play.
• Distribution channel — the distributor route has consolidated: following Home Depot's acquisition of GMS and Lowe's acquisition of Foundation Building Materials [22][23], standalone public distributors offer less direct exposure than they once did. Drywall distribution is now a small piece of the big-box retailers' consolidated businesses.

Near-term drivers to watch (forward-looking):

• Interest rates and housing starts — the dominant lever; rate relief would lift the new-construction segment that swings volumes.
• Repair-and-remodel demand — the ballast tied to an aging, high-equity housing stock.
• Nonresidential build-out, notably data centers and infrastructure-adjacent construction.
• Feedstock economics — how cleanly producers replace retiring FGD gypsum with mined and imported rock, and where natural-gas prices sit.
• Pricing discipline — whether the consolidated field holds prices (and ~38%-type wallboard margins) through the next soft patch, or lets utilization slack turn into price competition.

The reported picture is an industry that is small in headcount, large in output, highly concentrated, and mostly private or foreign-owned, earning strong margins behind a freight moat. The forward judgment is that its fortunes ride on the U.S. housing and construction cycle, with a structural raw-material transition (away from coal-derived gypsum) as the defining medium-term cost story.

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Sources

1. U.S. Census Bureau. County Business Patterns 2023, NAICS 327420 (establishments, employment, payroll). https://www.census.gov/programs-surveys/cbp.html
2. U.S. Census Bureau. 2022 Economic Census — Concentration Ratios & Selected Statistics, NAICS 327420 (receipts, firms, CR4/CR8/CR20/CR50, HHI). https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Small Business Administration. Table of Small Business Size Standards (NAICS 327420 = 1,500 employees), 2023. https://www.sba.gov/document/support-table-size-standards
4. U.S. Geological Survey. Mineral Commodity Summaries 2025: Gypsum, 2025. https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-gypsum.pdf
5. U.S. Geological Survey. Mineral Commodity Summaries 2026: Gypsum, 2026. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-gypsum.pdf
6. Grand View Research. U.S. Gypsum Board Market Size & Outlook, 2030, 2024. https://www.grandviewresearch.com/industry-analysis/us-gypsum-board-market-report
7. Emergen Research. US Drywall & Gypsum Board Market Size, Growth Outlook 2034, 2024. https://www.emergenresearch.com/industry-report/us-drywall-gypsum-board-market
8. The Freedonia Group. US Gypsum Demand Set to Fall in 2024 as Housing Completions Drop 14%, 2024. https://www.freedoniagroup.com/press-releases/us-gypsum-demand-set-to-fall-in-2024-as-housing-completions-drop-14
9. Eagle Materials Inc. Fourth Quarter and Fiscal Year 2025 Results (Light Materials/Gypsum Wallboard segment), 2025. https://ir.eaglematerials.com/news-releases/news-release-details/eagle-materials-announces-fourth-quarter-and-fiscal-year-2025
10. USG Corporation / Knauf. Knauf Completes Acquisition of USG Corporation, 2019. https://www.usg.com/content/dam/USG_Marketing_Communications/united_states/product_promotional_materials/finished_assets/news/19-04-24-knauf-completes-aquisistion-of-usg.pdf
11. Saint-Gobain / CertainTeed. Saint-Gobain Completes Acquisition of Continental Building Products (~$1.4B), 2020. https://www.saint-gobain-northamerica.com/company/newsroom/news-releases/saint-gobain-moves-forward-acquisition-continental-building-products
12. Wikipedia. National Gypsum (private ownership; Spangler/Delcor), accessed 2026. https://en.wikipedia.org/wiki/National_Gypsum
13. PABCO Gypsum. About / Company History (family-owned since 1976), accessed 2026. https://pabcogypsum.com/
14. Gypsum Association. Association Members (U.S. and Canadian producers), accessed 2026. https://gypsum.org/association-members/
15. Top Class Actions. Drywall Price-Fixing Class Action Settlement (In re: Domestic Drywall Antitrust Litigation, MDL 2437), 2016. https://topclassactions.com/lawsuit-settlements/lawsuit-news/drywall-price-fixing-class-action-settlement/
16. U.S. Environmental Protection Agency. AP-42, Chapter 11.16: Gypsum Manufacturing, 2020. https://www.epa.gov/sites/default/files/2020-10/documents/c11s16.pdf
17. Eagle Materials Inc. Form 10-K, Fiscal Year 2026, 2026. https://www.sec.gov/Archives/edgar/data/918646/000119312526230979/exp-20260331.htm
18. Eagle Materials Inc. Form 10-Q, September 2025 (fixed-cost structure disclosure), 2025. https://www.sec.gov/Archives/edgar/data/918646/000119312525258663/exp-20250930.htm
19. U.S. Census Bureau. New Residential Construction, May 2026. https://www.census.gov/construction/nrc/current/
20. U.S. Environmental Protection Agency. Coal Combustion Residuals Reuse, accessed 2026. https://www.epa.gov/coal-combustion-residuals/coal-combustion-residuals-reuse
21. U.S. Energy Information Administration. 2025 Coal-Capacity Retirements, 2025. https://www.eia.gov/todayinenergy/detail.php?id=67427
22. The Home Depot. Home Depot and Its Subsidiary SRS Distribution Complete Acquisition of GMS, 2025. https://corporate.homedepot.com/news/company/home-depot-and-its-subsidiary-srs-distribution-complete-acquisition-gms
23. Lowe's Companies Inc. Lowe's Completes Acquisition of Foundation Building Materials (SEC Form 8-K), October 2025. https://www.sec.gov/Archives/edgar/data/60667/000006066725000199/exhibit991-10092025.htm