Controversial Rockwool factory melting rocks, set to start shipping

Three years after neighbors were surprised to hear that ground had been broken in a former apple orchard in Jefferson County, West Virginia, to build a 24-hour-a-day insulation factory — prompting heated opposition and several legal challenges — the Denmark-based Rockwool company is set to begin shipping its products to customers.

The Rockwool factory in Ranson is now operating, melting basalt rock into molten lava, which is spun into a cotton-candy-like fiber used in home and business insulation.

“We’ve been producing products here over the last month,” said Paul Espinosa, public affairs manager for Rockwool’s Ranson plant, as the company gathers various product certifications needed. “We anticipate actually shipping product from this facility to our customers, beginning early this month.”

In August 2018, Trent Ogilvie, president of Rockwool’s insulation business in North America told WTOP the factory would not be harmful to health or the environment, as opponents launched a passionate attempt to stop the factory from being built on the site of the former Jefferson Orchards, across Route 9 from North Jefferson Elementary School.

Concerns about the possibility of hazardous emissions from the factory’s towers wafting 12 miles from Ranson into the vineyards and other agritourism business of Loudoun County, Virginia, prompted opposition from Board of Supervisors Chair Phyllis Randall.

Despite persistent scrutiny, the factory has been built; more than 100 employees have been hired, and a huge furnace that melts rocks at 2,700 degrees Fahrenheit is operating daily.

Tons of rocks are trucked to the Rockwool facility, where they are stored in covered outdoor bins before being loaded onto a conveyor belt, and transported to the melting furnace.

Much of the concern about potentially harmful emissions from the Rockwool factory was based on burning coal to fuel the furnace.

In July 2020, Rockwool announced its fuel-flexible melting furnace would only use natural gas. Espinosa said coal bins were taken out of the plans, and have never been delivered to the Ranson facility.

“We were able to start up our operations with 100% natural gas,” Espinosa said. “Our CO2 emissions are estimated to be about 30% less than they would be with the combination of coal and natural gas.”


The process in which the cotton-candy-consistency stone wool is turned into a loosely formed blanket is proprietary, according to Espinosa. During the WTOP tour of the factory, no photos were allowed of the machinery used during the melting furnace, spinning, or curing portions of the process.

Large conveyor belts transport the stone wool through the factory, where machines cut them into specific sizes and products.

The Ranson facility is Rockwool’s second U.S. factory; the other is in Byhalia, Mississippi.


“We’ve already been able to hire more than 110 new employees,” said Espinosa. “We’ll be ramping up to full staff of about 150 here, over the coming weeks and months.

Throughout the process, Rockwool officials have said the factory would provide good-paying jobs.

Jefferson County is the wealthiest county in the nation’s third-poorest state — West Virginia has a median household income of about $45,000.

“We really couldn’t be happier with the response we’ve seen to our hiring program,” Espinosa said. “And, I think that’s indicative of the growing acceptance we’re seeing in the community.”

Even as production ramps up toward 24-hour operation, opponents who fought to stop the factory from being built are now advocating that Rockwool “can and should operate more safely.”

Dr. Christine Wimer, president of the Jefferson County Foundation, is calling on Rockwool to implement processes and monitoring to protect air, water and the karst topography upon which the factory is built.

“If Rockwool truly wants to be the good neighbor it purports to be, it would embrace these changes and engage the concerned public in a good faith way,” Wimer said, in a statement to WTOP.


Rockwool paid for installation of two air-monitoring stations at local schools — North Jefferson Elementary and T.A. Lowery Elementary schools

The publicly available air monitoring results from the schools provide hour-by-hour readings of air quality, including measurements of particulate matter, formaldehyde, nitrogen dioxide and sulfur dioxide.

During the WTOP tour of the plant, Thursday, all readings were in the Good category — the healthiest ranking in the online monitoring dashboard.

human health risk assessment conducted for Rockwool by CTEH, an environmental consulting firm, in March 2020 found no discernible harm to human health.

“The ‘hazard index’ in relation to the Rockwool facility is more than 30 times lower than the level that would pose any potential risk to human health,” the report concluded. “The cancer risk for students attending the assessed schools in succession is estimated to be approximately 10 times lower than the EPA’s most protective risk threshold of one in one million.”

Espinosa says Rockwool “appreciates and recognizes” that there has been opposition to the factory.

“Our approach has been to be very transparent, not only during the construction phase but, now that we are beginning our startup operation, to help the community understand what they can expect to see here,” Espinosa said.


Neal Augenstein

Neal Augenstein has been a general assignment reporter with WTOP since 1997. He says he looks forward to coming to work every day, even though that means waking up at 3:30 a.m.

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