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The mission of the Historic Resources Committee (HRC) is to identify, understand, and preserve architectural heritage, both nationally and internationally. HRC is engaged in promoting the role of the historic architect within the profession through the development of information and knowledge among members, allied professional organizations, and the public.

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NPS uses lasers to clean biofilm off the Jefferson Memorial

  • 1.  NPS uses lasers to clean biofilm off the Jefferson Memorial

    Posted 12-17-2019 14:18
    In the last HRC newsletter, @Christine Reynolds described how volunteers used a gel based cleaner on the Korean War Memorial. ​But on the other side of the Tidal Basin, NPS is also using lasers to maintain the dome of the Jefferson Memorial.

    Learn more about the process here >

    Have any of you used a similar method in your practice?

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    Maggie Brown
    Washington DC
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    20.09.24 John Parkinson AIAU course


  • 2.  RE: NPS uses lasers to clean biofilm off the Jefferson Memorial

    Posted 12-18-2019 19:34

    This is not a sustainable use of expensive lasers as they do cause abrasion to surfaces.

     

    The National Park Service, the GSA and other bodies have long used D2 biocidal cleaner and deterrent on historic buildings and monuments. But no sound scientific reasoning has been given for not continuing to use this approach.

     

    John F

     

    John A. Fidler DipArch, MAarch, MAconservation, AAGradDiplconservation

                               RIBA, IHBC, Intl Assoc AIA, FRICS, FSA, FIIC, FAPT

     

    John Fidler Preservation Technology Inc

    image001.png@01D0DB9A.4B37A990

    Marina Towers North

    4640 Admiralty Way, Suite 500

    Marina Del Rey

    California 90292-6636

    USA

     

    Tel: 310-496-5730

    Cell: 310-498-4973

    Email: johnfidler@jf-pt.com

    www.linkedin.com/pub/john-fidler/13/921/794

     

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    20.09.24 John Parkinson AIAU course