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EX-99.1

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LP Building Solutions Reports Third Quarter 2026 Results Including Record Siding Sales

NASHVILLE, Tenn. (November 3, 2026) – Louisiana-Pacific Corporation (LP) (NYSE: LPX), a leading manufacturer of high-performance building products, today reported its financial results for the three and nine months ended September 30, 2026.

Third Quarter 2026 Summary, Compared to Third Quarter 2025

•Siding net sales increased by $30 million, or 7%, to $473 million

•Oriented Strand Board (OSB) net sales increased by $1 million to $180 million

•Net income was $23 million, an increase of $14 million

•Net income per diluted share was $0.32 per diluted share, an increase of $0.20 per diluted share

•Adjusted EBITDA(1) was $82 million, flat year over year

•Adjusted Diluted EPS(1) was $0.39 per diluted share, an increase of $0.02 per diluted share

•Cash provided by operating activities was $112 million

(1) This is a non-GAAP financial measure. See “Use of Non-GAAP Information” and “Reconciliation of Net Income to Non-GAAP Adjusted EBITDA, Non-GAAP Adjusted Income, and Non-GAAP Adjusted Diluted EPS" below for additional information regarding non-GAAP measures.

Capital Allocation Update

•Invested $56 million in capital expenditures during the third quarter of 2026

•Paid $21 million in cash dividends during the third quarter of 2026

•Maintained total liquidity of approximately $1 billion as of September 30, 2026

"Siding returned to volume growth in the third quarter and set a new record for net sales," said LP CEO Jason Ringblom. "LP's expanded distribution network positions SmartSide Trim & Siding for continued growth and share gains."

Outlook

LP is providing financial guidance for the fourth quarter of 2026 and full year 2026 as set forth in the table below. Guidance is based on current plans and expectations and is subject to a number of known and unknown uncertainties and risks, including those set forth below under “Forward-Looking Statements.”

Fourth Quarter 2026

Full Year 2026

Siding Net Sales Year-Over-Year Growth$390-400 million (~3% growth)$1.66-1.67 billion (~1% decline)

Siding Adjusted EBITDA(2)

$80-90 million (~22% margin(2)(3))

$415-425 million (~25% margin(2)(3))

OSB Adjusted EBITDA(2)(4) $(35) million$(95) million

Consolidated Adjusted EBITDA(2)(4)(5) $30-40 million$270-280 million

Capital Expenditures(6)

~$300 million

(2) This is a non-GAAP financial measure. Reconciliation of Siding Adjusted EBITDA, OSB Adjusted EBITDA, and consolidated Adjusted EBITDA guidance to the closest corresponding GAAP measure on a forward-looking basis is not available without unreasonable efforts. The inability to reconcile these measures is attributable to the inherent difficulty in forecasting and quantifying certain projected amounts necessary for such reconciliation. In particular, sufficient information is not available to calculate certain adjustments required for such reconciliation, such as loss on impairment attributed to LP, business exit credits and charges, product-line discontinuance charges, other operating credits and charges, net, loss on early debt extinguishment, investment income, and other non-operating items that would be included in the comparable forecasted U.S. GAAP measures. These adjustments may have a significant impact on future U.S. GAAP financial results.

(3) This is a non-GAAP financial measure and is calculated as Siding Adjusted EBITDA divided by Siding net sales.

(4) In calculating fourth quarter and full-year OSB Adjusted EBITDA, LP assumes that OSB prices published by Random Lengths remain unchanged from those published on October 30, 2026 (this is an assumption for modeling purposes and not a price forecast).

(5) For purposes of calculating the fourth quarter and full year 2026 consolidated Adjusted EBITDA, LP assumes that other operations will contribute approximately $(15) million and $(50) million in the fourth quarter and full-year, respectively.

(6) LP expects to spend approximately $140 million on strategic growth projects and $160 million on sustaining maintenance projects in full-year 2026.

Segment Results

Siding

The Siding segment serves diverse end markets with a broad product portfolio of engineered wood siding, trim, soffit, and fascia. Our Siding is offered primed (LP® SmartSide® Trim & Siding, LP BuilderSeries® Lap Siding, and LP® Outdoor Building Solutions®) and prefinished (LP® SmartSide® ExpertFinish® Trim & Siding) to meet the needs of builders and installers in new construction and repair and remodeling applications.

Sales and Adjusted EBITDA for this segment were as follows (dollar amounts in millions):

Three Months Ended September 30,Nine Months Ended September 30,

20262025% Change20262025% Change

Net sales$473 $443 7 %$1,274 $1,305 (2)%

Adjusted EBITDA119 117 1 %333 348 (4)%

Percent changes in average net selling prices and unit shipments in Siding for the three and nine months ende

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