Louisiana-Pacific
American manufacturer of oriented strand board and other engineered wood building products.
Last updated October 14, 2026
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Overview
Louisiana-Pacific Corporation, commonly known as LP, is an American building-materials manufacturer whose principal business is the production of engineered wood products for residential and commercial construction. The company is best known for oriented strand board, or OSB, a structural panel made by processing small-diameter wood into strands, blending the strands with resin, and pressing them into panels. LP also manufactures engineered siding, laminated structural components, subflooring and related construction products. Its products are sold primarily to builders, contractors, distributors, building-material dealers and retail home centers rather than directly to end consumers. LP was incorporated on January 5, 1973, as part of the court-ordered breakup of Georgia-Pacific. William H. Hunt, previously a Georgia-Pacific vice-chairman, became the company's first chairman, while Harry A. Merlo served as chief executive from the company's formation and became chairman in 1974. LP spent its first several decades headquartered in Portland, Oregon, before moving its headquarters to Nashville, Tennessee, in 2004. The company developed an important early position in OSB during the late 1970s. Its wafer-based structural panels, initially sold under the Waferwood name and later associated with the Inner-Seal brand, provided an alternative to plywood sheathing and subflooring. The technology allowed LP to use smaller, faster-growing trees rather than depending exclusively on large, old-growth timber. During the 1980s LP expanded into engineered I-beams, laminated veneer lumber, siding, insulation and other reconstituted-wood products. These products used wood fibers and veneers efficiently while providing lighter or more consistent alternatives to some traditional solid-lumber components. LP grew through acquisitions and vertical expansion. It acquired lumber companies and timberland in several U.S. states, bought Fibreboard Corporation in 1976, and established additional distribution capacity through the purchase of building-material centers in southern California in 1979. The 1986 acquisition of Kirby Forest Industries and related California timber properties enlarged LP's timberland base. In the 1990s, the company added businesses such as ABT Building Products, Forex and Evans Forest Products, while also developing specialty products including siding, energy-efficient structural panels, flooring and cellulose insulation. The company faced a severe crisis in the 1990s after homeowners alleged that its Inner-Seal siding deteriorated prematurely in some applications. LP settled extensive homeowner claims without admitting wrongdoing, re-engineered the siding technology and later marketed the replacement product as LP SmartSide. The litigation and associated claims produced substantial costs, including a large settlement program, and were accompanied by a securities class action and other legal and regulatory matters. Harry Merlo left the chairmanship and chief executive role in 1995 after the board expressed a loss of confidence in senior leadership. Mark Suwyn, formerly of International Paper, succeeded him and led a restructuring focused on closing or selling underperforming operations, reducing debt, improving manufacturing productivity and emphasizing specialty products. By the late 1990s LP had returned to profitability. In the following decade it continued to reshape its portfolio through divestitures and asset sales, concentrating increasingly on engineered wood and building products rather than the broader mix of timber, pulp and commodity operations it had held earlier. The Nashville-based company remains associated with OSB, siding and other engineered wood systems sold through North American construction-material channels. Its present brand architecture includes LP SmartSide siding and trim, LP OSB panels, LP TechShield radiant-barrier panels, LP TopNotch subflooring and LP engineered structural products, although product availability and manufacturing locations can change over time.
History
Louisiana-Pacific was established in 1973 during the breakup of Georgia-Pacific. William H. Hunt became its first chairman, and Harry A. Merlo served as chief executive from the beginning before also becoming chairman in 1974. The new company initially built a diversified forest-products platform, acquiring lumber operations, timberland and manufacturing businesses across the United States and Canada. Its early distribution strategy included the 1979 purchase of building-material centers in southern California. LP's defining technological development was the commercialization of oriented strand board. Instead of using large logs to make conventional plywood, OSB uses strands from smaller trees that are oriented, bonded with resin and compressed into structural panels. LP developed early wafer-based products under the Waferwood name and later expanded the Inner-Seal line. The approach offered a way to manufacture structural sheathing and subflooring from more efficiently harvested timber. During the 1980s, LP extended its engineered-wood capabilities into I-beams, laminated veneer lumber, concrete-form panels and exterior siding. It also expanded into insulation, hardboard, medium-density fiberboard, plywood and pulp. Acquisitions accelerated in the 1980s and 1990s. The Fibreboard purchase in 1976 added products used in furniture and cabinet manufacturing. Kirby Forest Industries and related California timber properties were acquired in 1986. In 1990 LP added Weather Guard and MiTek Wood Products, broadening its exposure to insulation and engineered structural components. Later acquisitions included ABT Building Products, Forex and Evans Forest Products. LP also created an Advanced Technology Center in 1997 to support product development and introduced products such as Smart Start siding, TechShield panels, TopNotch flooring and Cocoon insulation. The company's expansion was interrupted by the construction downturn and a major product-liability crisis. Weak housing demand affected lumber, plywood and other building products around 1990, while competition increased as OSB became a common commodity product rather than a specialized LP innovation. More seriously, homeowners alleged that Inner-Seal siding deteriorated prematurely, including cases involving moisture exposure. LP settled multiple lawsuits and established a claims process; the product was re-engineered and replaced by SmartSide. The company also faced a shareholder securities lawsuit and environmental and fraud-related allegations concerning a Colorado facility. These events contributed to a leadership transition in 1995, when Merlo departed and Mark Suwyn became chairman and chief executive. Suwyn's recovery program combined plant closures, asset sales, cost reduction, operational improvement and renewed investment in specialty products. LP closed or sold numerous facilities and divested timberland and noncore businesses, while retaining a stronger focus on engineered wood and construction materials. The company returned to profitability in 1998 after losses in 1995, 1996 and 1997. Through the 2000s LP continued to restructure, reduce debt and dispose of noncore assets. It moved its headquarters to Nashville in 2004. The company also had a visible local sports association: it owned the Portland Timbers from 1979 to 1982 and held naming rights to Nashville's LP Field from 2006 to 2015. In its modern form, LP is primarily identified with OSB, engineered siding and related structural systems. It sells through distributors, dealers and home-improvement channels to builders and homeowners in North America and selected South American markets. Its brand strategy emphasizes engineered performance, resource efficiency, installation consistency and product systems designed for residential construction.
- 2006
LP Field naming-rights period begins
[1]LP becomes the naming-rights sponsor of Nashville's football stadium, a relationship that lasted through 2015.
- 2004
Headquarters moves to Nashville
[1]The corporate headquarters relocates from Portland, Oregon, to Nashville, Tennessee.
- 1998
Return to profitability
[1]LP reports a return to profit after several difficult restructuring years.
- 1997
Advanced Technology Center and SmartSide development
[1]LP strengthens product development and introduces new engineered construction-product systems.
- 1995
Leadership transition and restructuring
[1]Mark Suwyn succeeds Harry Merlo as the company begins a major recovery program.
- 1990
MiTek and Weather Guard acquisitions
[1]LP expands into engineered wood I-beams, laminated products and recycled-newsprint insulation.
- 1986
Kirby Forest Industries acquired
[1]The transaction significantly increases LP's timberland and forest-products holdings.
- 1980
First Inner-Seal mill opens
[1]LP begins production associated with its Inner-Seal structural-panel and siding platform.
- 1979
Southern California building-material centers acquired
[1]LP adds distribution capacity by purchasing fifteen centers from Lone Star Industries.
- 1976
Fibreboard Corporation acquired
[1]The acquisition expands LP's manufacturing portfolio into fiberboard products used in furniture and cabinets.
Products and positioning
Engineered wood and structural building-products manufacturer focused on material efficiency, construction performance and specialty products.
Structural panels · 1970
LP OSB
Oriented strand board panels made by compressing resin-bonded wood strands into structural sheets. LP OSB products are used in applications such as wall, roof and floor sheathing, where builders need consistent panel dimensions and structural performance. The line represents the core of LP's historical and current engineered-wood manufacturing expertise.
Engineered siding and trim · 1997
LP SmartSide
An engineered wood siding and trim platform developed after LP re-engineered its earlier Inner-Seal siding products. SmartSide products are designed for residential exterior applications and are sold in forms such as lap siding, panel siding, shakes, architectural trim and related profiles. The system is positioned around the appearance of traditional wood siding combined with engineered manufacturing and protective treatments.
Radiant-barrier structural panels · 1997
LP TechShield
Structural roof and wall panels incorporating a reflective surface intended to reduce radiant heat transfer in building assemblies. TechShield combines sheathing functionality with a radiant-barrier layer, allowing builders to install the product as part of a roof or wall system rather than adding a separate reflective material.
Subflooring · 1997
LP TopNotch
An engineered wood subflooring product line designed for residential construction. TopNotch panels are manufactured for use beneath finished flooring and are marketed around installation features, panel consistency and resistance to common subfloor concerns. It was among the specialty product systems developed during LP's late-1990s recovery and product-diversification program.
Engineered structural components · 1980
LP engineered structural products
A group of engineered wood components including laminated veneer lumber and wood I-joists used for floor joists, rafters, headers and other structural applications. These components use veneers or wood webs and flanges to provide lighter, dimensionally consistent alternatives to some solid-sawn members.
Insulation · 1997
Cocoon insulation
Cellulose insulation made from recycled newsprint and other processed fiber materials. LP developed and marketed this product as part of its broader effort to supply construction materials beyond structural panels and lumber. The line was associated with LP's specialty-products expansion in the 1990s.
Controversies
1996
Shareholder securities lawsuit settlement
LP paid to settle a shareholder class action alleging that it had failed to disclose problems associated with its oriented strand board products. The settlement was reported as one of the largest securities settlements in Oregon at the time.
1996
Sexual-harassment lawsuit involving former chief executive
The company settled a sexual-harassment lawsuit filed against former chief executive Harry Merlo.
1995
Colorado plant allegations
Colorado authorities brought fraud and environmental-violation allegations involving LP's Montrose facility. The matter formed part of a broader period of legal and governance difficulty for the company.
1990
Inner-Seal siding litigation
Homeowners alleged that certain Inner-Seal OSB siding products experienced premature rotting, discoloration, disintegration and fungal growth. LP settled extensive claims, created a claims process and re-engineered the product line as SmartSide without admitting wrongdoing.
Marketing campaigns
- 2006LP Field naming rights
United States
LP sponsored the naming rights for Nashville's football stadium, which hosted the Tennessee Titans and Tennessee State University football. The naming arrangement continued until 2015 and increased the company's visibility in its headquarters market.
Outcome. Naming-rights agreement ended in 2015.
Brand decisions
2004
Relocate corporate headquartersStrategyBackground
After more than three decades in Portland, Oregon, LP reorganized its corporate base as part of its evolving national operating structure.
Action taken
LP moved its headquarters to Nashville, Tennessee.
Aftermath
Nashville became the company's continuing corporate headquarters.
1997
Launch re-engineered siding and specialty systemsProduct launchBackground
LP sought to rebuild its product portfolio and reputation after Inner-Seal siding claims while reducing dependence on commodity lumber.
Action taken
The company introduced SmartSide and other specialty systems, including TechShield, TopNotch and Cocoon.
Aftermath
The new products supported LP's shift toward engineered and differentiated building materials.
1995
Replace senior leadershipOtherBackground
LP faced product litigation, weak building-material markets, increased OSB competition and substantial losses. Its board expressed a loss of confidence in Harry Merlo and two senior executives.
Action taken
Mark Suwyn, a former International Paper executive, became chairman and chief executive and began a restructuring program.
Aftermath
The company closed plants, sold assets, reduced its exposure to noncore operations and emphasized specialty engineered products. LP returned to profitability in 1998.
Recent events
- 2004
Louisiana-Pacific moves headquarters to Nashville[1]
Other
LP relocated its corporate headquarters from Portland, Oregon, to Nashville, Tennessee.
- 1997
LP introduces SmartSide siding[1]
Product launch · Product generation
Following the Inner-Seal experience, LP introduced a re-engineered siding platform marketed as SmartSide.
- 1973
Louisiana-Pacific is created in the Georgia-Pacific breakup[1]
Other
Louisiana-Pacific was incorporated as a separate company following a court-ordered antitrust restructuring of Georgia-Pacific.
- 1970
LP begins commercial OSB production in the United States[1]
Product launch
The company developed and commercialized wafer-based structural panels that became an important alternative to plywood.
Sources2 sources
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