Trex 2025 Sustainability Report

2025 SUSTAINABILITY REPORT

INTRODUCTION

PRODUCTS

ENVIRONMENT

PEOPLE

LEADERSHIP

SUPPLEMENT

17

ONE COLOR SPRUCE

ONE COLOR BLACK

ONE COLOR

Energy and Climate Impact

metric tons of CO 2 e, a decrease of 3% compared to 2024. Our GHG emissions intensity was 88 metric tons of CO 2 e/$ million sales, a decrease of 3% compared to 2024. These decreases primarily resulted from production changes relating to demand and increased manufacturing efficiencies. In 2025, we conducted an internal calculation of our Scope 3 emissions to deepen our understanding of our value chain impacts and identify additional opportunities for reduction. As sustainability regulations evolve—such as the California Climate Corporate Data Accountability Act—we continue to monitor emerging requirements to ensure we meet expectations for emissions reporting and climate-related risks.

We take an energy-smart approach to our manufacturing processes and transportation to reduce our energy and fuel consumption and consequent greenhouse gas (GHG) emissions. Our focus on energy efficiency applies to all the electricity, natural gas and fuel usage in our operations. In 2025, our overall energy usage totaled 412,975 MWh, a decrease of 3% compared to 2024. Our energy intensity was 352 MWh/$ million sales, a decrease of 5% compared to 2024. Our absolute carbon emissions (Scope 1 and 2) totaled 101,890 LOGO USAGE

Energy Use

Scope 1 & 2 GHG Emissions 4

2025

2025

2023

2024

2023

2024

412,975

32,951 66,296 68,939 99,247 101,890

Total energy use (electricity, natural gas and fuels) – MWh

369,186

426,922

Scope 1 – Metric tons CO 2 e

29,854 60,893 59,559 90,747 89,413

35,416 66,915 69,637 102,331 105,053

352

Energy use intensity – MWh/$ million sales

337

371

Scope 2 (location-based) – Metric tons CO 2 e Scope 2 (market-based) – Metric tons CO 2 e

Breakdown of Energy Use (MWh)

Scope 1 & Scope 2 (location-based) – Metric tons CO 2 e Scope 1 & Scope 2 (market-based) – Metric tons CO 2 e GHG emissions intensity (Scope 1 & Scope 2 market-based) – Metric tons CO 2 e/$ million sales

2025

2023

2024

237,590

Electricity for manufacturing Natural gas for manufacturing

209,089

237,014 170,773

88

82

91

157,716

144,613

N/A 5

Scope 3 – Metric tons CO 2 e

N/A

N/A

9,665 7,878

Propane for forklift trucks

8,994 6,490

10,202

Diesel for backup generators, fire pumps and intra-site transport Solar-generated electricity at Trex headquarters office (above right) 1

8,909

92

N/A

107

Breakdown of Energy Use 2025 (%) 2

Propane for forklift trucks 2.3%

Natural gas for manufacturing

38.2%

Diesel for backup generators, fire pumps and intra-site transport 1.9%

1 The headquarters office opened in June 2023 (above). 2 Totals may not add up to 100% due to rounding. 3 This includes on-site renewable energy generated as part of all administrative and support operations. 4 Location- and market-based GHG calculation methodologies are defined under the World Resources Institute GHG Protocol. 5 In 2025, we conducted an internal calculation of our Scope 3 emissions to deepen our understanding of our value chain impacts and identify additional opportunities for reduction.

57.5%

Electricity 3 for manufacturing

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