Cape Hatteras Lighthouse makeover underway
Published 7:40 am Tuesday, November 17, 2020
The National Park Service is undertaking restoration of the historic Cape Hatteras Lighthouse.
Research about how to remove red, white and black paint from the 150-year old structure is underway with a demonstration of dry-ice removal.
The new method would replace chemical peeling or sand blasting, both of which leave residue or damage masonry. The dry-ice demonstration using a nozzle only produced large chips of white paint in what appeared to be two paint layers which were easily picked up.
The park service aims to remove the lighthouse paint in order to solve a moisture problem. The supposition is that the layers of paint are trapping water. A modern “breathable” paint is suggested, along with fixing mortar inside and out. A moisture monitoring system has been installed in the air space between the outside and inside walls of the lighthouse to provide additional information.
On the outside of the lighthouse, 11,800 square feet of paint must be removed. On the inside, 5,700 square feet will be returned to the original surface.
HydroPrep in Newport News set up the dry-ice demonstration. A blue tote held 500 pounds of dry ice pellets which were transferred to the blast pot. From there, compressed air powered dry ice pellets through a nozzle to remove the paint.
“The dry ice blast testing was effective at removing paint from the exterior of the lighthouse,” says a statement issued by the Cape Hatteras National Seashore. “We are awaiting a report from the test to review and determine if this is the method we will use to remove the paint as phase one of the lighthouse project.”
The restoration project includes repairing or replacing all metal work, working on the black-and-white stone tiling floor at the entrance, replacing two wooden doors, building a historically accurate surrounding fence, and restoring the landscape with native grass.
In a National Park Service budget justification document, total project cost for the lighthouse restoration project is $22,847,000 of which $4.12 million has already been committed. Scheduled for fiscal year 2021 is $18.73 million.
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