NYC 9/11 Public Portal Document
e. There is existing or potential water damage to asbestos containing material;
f. The asbestos-containing material is more than one inch thick; and is used to
cover ceilings, walls, beams, or other structural members;
g. The asbestos-containing material is subject to high vibration.
ii. Encapsulation may be performed when:
a. Damage to the material is improbable;
b. The asbestos-containing material is granular or cementitious;
c. The encapsulating material is known to bond asbestos to the subsurface and
asbestos-containing material and also retains its bonding integrity;
d. Asbestos-containing material has been removed and loose fibers remain
which should be bonded.
iii. If encapsulation is used as a method of asbestos abatement the following
maintenance procedures shall be employed:
a. A periodic monitoring and maintenance program consisting of inspection at
least annually to check for damage to all encapsulated surfaces;
b. Maintenance of records by the building owner, on the locations and
condition of the encapsulated material;
iv. Sealants considered for use in encapsulation shall first be tested to ensure that
the sealant is adequate for its intended use. A section of the asbestos-containing
materials shall be evaluated following this initial test application of the sealant
to quantitatively determine the sealants effectiveness in terms of penetrating and
hardening the asbestos-containing material, its toxicity, its flammability, its
tolerance to disturbance or abuse, its solubility (dissolvability) in water, its
effects on the acoustical properties of the asbestos-containing material, and its
tolerance to top-covering paints. The United States Environmental Protection
Agency, Office of Toxic Substances, has developed guidelines for the use of
encapsulants on asbestos-containing materials which discuss advantages and
disadvantages of encapsulation. The American Society of Testing and Materials
(ASTM) Committee E06.221.06E on Encapsulation of Building Materials has
developed a guidance document to assist in the selection of an encapsulant once
a decision to encapsulate has been made. When a choice of an encapsulant has
been made, written justification of this choice (based on the characteristics of
the encapsulant, the asbestos-containing material to be encapsulated, and the
substrate surface underneath the asbestos-containing material) shall be included
in the job specifications, and a copy of this justification shall be available for
review at the job site.
v. Before encapsulation is performed, all loose and hanging asbestos-containing
material shall be removed while damp, and disposed of in accordance with
Federal, State and Local guidelines.
NYC-WTC 000128575
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