What is CleanFiber?
Founded in 2013 and formerly known as Ultracell Insulation, CleanFiber specializes in the production of high-purity cellulose insulation. The company utilizes a proprietary, patented process to blend pulped recycled cardboard with other clean paper feedstocks, resulting in a superior thermal insulation product. By diverting waste from landfills and repurposing it into essential building materials, CleanFiber addresses the dual challenges of waste management and energy efficiency in modern construction. The company operates at the intersection of industrial manufacturing and environmental sustainability, providing a scalable solution for developers and contractors seeking to reduce the carbon footprint of their projects.
How much funding has CleanFiber raised?
CleanFiber has raised a total of $84M across 7 funding rounds:
Grant
$100K
Debt
$870K
Other Financing Round
$10M
Series B
$28M
Private Equity
$34M
Private Equity
$6.5M
Debt
$4.5M
Grant (2014): $100K with participation from United States Environmental Protection Agency
Debt (2017): $870K, investors not publicly disclosed
Other Financing Round (2022): $10M supported by AXA IM Alts
Series B (2024): $28M featuring Climate Innovation Capital, Spring Lane Capital, and Global Brain
Private Equity (2025): $34M, investors not publicly disclosed
Private Equity (2025): $6.5M, investors not publicly disclosed
Debt (2026): $4.5M, investors not publicly disclosed
Key Investors in CleanFiber
Climate Innovation Capital
A venture firm dedicated to decarbonizing the economy by funding commercial innovations that offer significant economic and environmental returns.
Spring Lane Capital
An investment firm specializing in sustainable real assets and the missing middle of project finance, focusing on waste-to-value and energy infrastructure.
Global Brain
An independent venture capital firm providing hands-on support and strategic consulting to help startups achieve global scale through corporate collaboration.
What's next for CleanFiber?
With the recent infusion of $4.5M, CleanFiber is well-positioned to expand its production capacity and deepen its market penetration. The company's strategic focus will likely center on optimizing its supply chain for recycled feedstocks and scaling its manufacturing footprint to meet the rising demand for sustainable building materials. As the construction industry faces increasing pressure to adopt low-carbon alternatives, CleanFiber's ability to deliver high-performance, eco-friendly insulation provides a distinct competitive advantage. Future growth will likely involve further integration into large-scale infrastructure projects, supported by the technical expertise and financial backing of its current investor base, which remains committed to the long-term decarbonization of the built environment.
See full CleanFiber company page
