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FEMA correspondence regarding historic building cleaning treatments, February 2002

Machine-extracted title · confidence 95%

Letter from FEMA providing a list of historic buildings and recommended cleaning treatments for post-disaster recovery.

NYC-WTC_000093746–000093777

Folder label: “LANDMARK INFORMATION

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NYC 9/11 Public Portal Document ]VIHIS. I . LUUL I I LOHIVI NU. 192

A cleaning system appropriate for a specific masonry adjacent masomy mortar joints.. The removal of material may not be appropriate for paint/stain on mortar joints should be avoided possible. if

Reducing the strength of the removal agent and/or the pressure applied for removing paint/stain can minimize "clean spots" left,on masonry. the Masonry surfaces should be tested with non-staining ph strips after removals are cgmpleted order to ensure that the substrate has been adequately neutralized. Neutralizing a surface in

involves removing all chemical and/or cleaning agents been neutralized can lead to subsequent damage of from the fabric. .A substrate that has not the historic fabric. Applied Paint (Signage) to Significant Interior Historic Fabric: If paint (signage) is applied to significant interior fabric (e.g. murals, mosaics, , decorative metals) an architectural and/or art conservator should be consulted experienced possible to successfully remove applied overpaint regarding any treatment or removal. It is from even the most decorative or fragile substrates.

Health, Safety, and Environmental Issues:

• It is the responsibility of the Applicant to obtain all

local, federal and state permits prior to the commencement of work and adhere to all local, state and federal laws with respect to the application and disposal of potential hazardous waste materials. Sources:

AIC Ethics and Standards Committee. "AIC Code of Ethics and Guidelines for Practice." Revised August, 1994,

Grimmer, Anne E. "Dangers of Abrasive Cleaning to. Historic Buildings." Preservation Brief Number 6. Washington, DC: National Park Service, 1979.

New York Landmarks Conservancy. Historic Building and Rehabilitation. New York: John Wiley & Sons, Facades. The Manualfor Maintenance Inc., 1997. Weaver, Martin E. "Removing Graffiti from Historic Masonry." Preservation Brief Number 38. Washington, DC: National Park Service, 1995.

• Note: National Park Service Preservation Briefs, including those referenced in these performance standards, are available on the Internet; keyword Preservation Briefs.

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NYC-WTC 000093774

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NYC-WTC_000093774Source: NYC Law Department, mirrored locally

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