A landfill site using TIEROC as an alternative to rock and stone for enhanced productivity and efficiency.

Optimize RNG Production

TIEROC adc acts as a secondary biogas producer—supporting faster RNG payback

A landfill management site utilizing the best alternative daily cover (ADC) for road base on Ann Road, enhancing operational efficiency and environmental compliance.

A landfill road constructed with TIEROC, an engineered aggregate substitute made from recycled railroad ties, providing a durable and sustainable surface for heavy machinery.

Turn Daily Cover Into RNG Performance and Revenue

Midwest landfills are adopting TIEROC®, an engineered Alternative Daily Cover (ADC) made from clean, recycled wood, to preserve airspace, capture more methane, and boost renewable natural gas (RNG) revenue. Industry momentum is clear: a far larger share of landfill gas is being upgraded to RNG, alongside sustained biogas investment nationwide.

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RNG Optimization for Landfills

Why This Matters Now

RNG is scaling fast. Since 2020, a much larger portion of landfill gas has been converted to RNG.

Capital is flowing. Biogas project investment exceeded $1B in both 2023 and 2024.

Compliance still rules. ADC must meet state requirements and perform like six inches of soil to control vectors, litter, odors, and more.

“TIEROC is more than a cover solution, it’s a revenue catalyst. By preserving airspace, enabling methane capture, and fueling RNG production, TIEROC helps operators turn compliance into profitability.”

— Greg Kutschke, Executive Vice President, TiEnergy

What is TIEROC?

TIEROC is a high‑performance ADC engineered from clean, recycled wood. It applies cleanly, resists weather slowdowns, and helps landfills preserve airspace while supporting consistent methane capture for RNG projects.

Key benefits at a glance

Optimized RNG performance: Consistent cover that supports steady biogas generation and capture.
More capacity, less cost: Replaces thick soil lifts with lightweight cover to preserve valuable airspace.
Weather‑resistant uptime: Applies cleanly through rain, snow, and freeze‑thaw cycles, keeping crews and equipment moving.
Compliance‑ready: Clean, even application that passes inspector scrutiny.
Circular economy loop: Recycled rail ties → clean wood → ADC → methane capture → RNG → renewable power.

Why permeable cover matters

Moisture enables biology. TIEROC’s permeable, wood‑fiber matrix allows precipitation to enter the cell, helping maintain the moisture conditions that support microbial decomposition and biogas generation.
Operations in wet conditions. The material’s texture and application help avoid mud‑bound working faces, reducing stuck trucks and improving uptime.

Sustainability Impact

Alternative Daily Cover (ADC) refers to material—other than soil—that is placed over the active face of a municipal solid waste landfill at the end of each operating day. ADC helps control odors, blowing litter, scavenging, pests, and fire risk.

TIEROC is a modern ADC solution made from clean, recycled wood. Unlike traditional stone or mixed debris, TIEROC is engineered for performance, affordability, and sustainability. It supports renewable gas (RNG) production, and offers significantly more coverage per dollar—making it a smarter alternative to soil, rock, or waste-based filler.

What is Alternative Daily Cover (ADC) for Landfills?

Alternative Daily Cover (ADC) refers to material—other than soil—that is placed over the active face of a municipal solid waste landfill at the end of each operating day. ADC helps control odors, blowing litter, scavenging, pests, and fire risk.

TIEROC is a modern ADC solution made from clean, recycled wood. Unlike traditional stone or mixed debris, TIEROC is engineered for performance, affordability, and sustainability. It supports renewable gas (RNG) production, and offers significantly more coverage per dollar—making it a smarter alternative to soil, rock, or waste-based filler.