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CleanFiber

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Makes high performance building insulation from recycled corrugated cardboard

Buffalo, United StatesFounded 2013Energy
Valuation $100–250M Last recorded · 2025
Headcount <100 Current team size
Total funding $100–500M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for CleanFiber and the history behind them.

About CleanFiber

CleanFiber is an innovative startup that specializes in producing high-quality cellulose insulation. The company was founded by experienced cellulose installers in Maine who identified a growing problem: the dwindling supply of newsprint, which is traditionally used to make cellulose insulation. To address this issue, CleanFiber has developed a unique process that repurposes cardboard boxes, a resource that is increasingly abundant due to the rise of e-commerce.

CleanFiber operates in the building materials market, specifically targeting the insulation segment. Their primary clients include contractors, builders, and homeowners who are looking for effective and sustainable insulation solutions. The company’s product is particularly attractive to those who prioritize eco-friendly building practices and high-performance materials.

The business model of CleanFiber revolves around manufacturing and selling cellulose insulation. They have invested heavily in a state-of-the-art production facility in Buffalo, which is capable of producing 3 million bags of insulation annually. This facility ensures that the company can meet the growing demand for their product while maintaining high standards of quality and consistency.

CleanFiber makes money by selling its insulation directly to contractors and builders, as well as through distribution channels that reach homeowners. Their product is competitively priced and offers several advantages over traditional cellulose insulation, such as better consistency, fewer contaminants, and enhanced fire resistance. These features make CleanFiber’s insulation a compelling choice for clients who want reliable and safe insulation for their buildings.

In summary, CleanFiber is a forward-thinking company that has turned a potential supply chain issue into a business opportunity. By leveraging the increasing availability of cardboard boxes, they have created a sustainable and high-quality insulation product that meets the needs of modern builders and homeowners.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2013
Headquarters
Buffalo, United States
Employees
54
Open positions
None listed
Dealroom signal
63.7/100
Industry
Real Estate, Energy
Sub-industry
Waste Solution, Construction
Sector
Energy, Social Entrepreneurship, Insulation Solutions, Sustainable Development Goals, Urban Tech, Advanced Materials, Climate Tech, Green Buildings, Circular Economy, Sustainable Building Construction
Business model
Manufacturing

Funding history

10 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES COther financing Sep 2025 $40M $160M AXA Investment Managers · Beacon Venture Partners · Ahlström Invest —
GRANTOther financing Oct 2024 $20M — US Department of Education ↗
Showing the latest 2 of 10 recorded eventsBook a demo for the full funding history →

Growth signals

CleanFiber website traffic

Latest recorded traffic for CleanFiber is 3.2K monthly website visits, up 88.2% over the last three months. CleanFiber's team declined 10% over the past year.

Latest monthly visits3.2K 3-month web change+88.2% 1-year team growth-10%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

Company identity and context are open; selected comparison metrics preview what is available on the platform.

Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

24 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed10 investors entered at this stage

  • Rochester Angel Network
  • NXT Ventures
  • Walnut Venture Associates
  • Boston Harbor Angels
  • Clean Energy Venture Group
  • Massachusetts Clean Energy Center
  • US National Science Foundation
  • 43North
  • Buffalo Angels
  • US Department of Education

Series A11 investors entered at this stage

  • SustainVC
  • Closed Loop Partners
  • Western New York Impact Investment Fund
  • NOCO Energy
  • Jeff Wilke
  • Aligned Climate Capital
  • AXA Investment Managers
  • Spring Lane Capital
  • Global Brain Corporation
  • Climate Innovation Capital
  • Tokyu Construction

Series B and later3 investors entered at this stage

  • Lapis Advisers
  • Beacon Venture Partners
  • Ahlström Invest
Team profiled 10 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 4 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
3 countries with
team presence
🇺🇸 United States92.5%
🇫🇷 France2.5%
🇨🇦 Canada2.5%
3 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about CleanFiber on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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