NYC 9/11 Public Portal Document
vi. Filler materials used to repair damaged
and missing areas of asbestos-containing
material shall contain no asbestos, shall adhere
well to the substrate and shall
provide an adequate base for the encapsulating
agent.
vii. Encapsulated asbestos-containing
materials shall .be identified by signs, labels,
color coding or some other mechanism to warn
persons who may be required to
disturb the material that asbestos is present.
viii. Where encapsulants are sprayed on
asbestos-containing materials:
1. Low pressure airless spray shall be
used. The airless spray gun shall have
an appropriately sized tip which shall be
tested by briefly spraying the
encapsulant onto a surface from approximately 12
inches away. An
appropriately sized tip will spray the encapsulant in a
fan approximately
eight inches wide; it will also distribute the
encapsulant uniformly within the
fan, giving even coverage.
2. A suitable quantity of HEPA
filtration units shall be used during the•
encapsulation process which shall have sufficient
capacity to cause one
complete air exchange every 30 minutes.
3. At least three coats of the encapsulant
shall be applied to the surface of the
asbestos-containing material. Each coat shall be
applied in a two-step
procedure. The first step is to apply a light mist
loose fibers and keep them from breaking coat to moisten and seal any
away from the surface. This mist
coat should be applied in three or four quick
24 inches from the surface. After an area passes with the gun held 18 to
of 16 to 20 square feet has been
give the mist coat, a heavier coating is
applied, using 8 to 10 passes with the
gun held 10 to 12 inches from the material.
The gun should be kept in
constant motion to create a smooth and even
coat. This two-step application
shall be considered one coat of encapsulant.
Each subsequent coat shall be
applied at a 90 degree angle to the direction
of the preceding coat
application, to ensure complete coverage of the as
material. When questions rise regarding drying bestos-containing
or use under different weather conditions, time, curing time, dilution,
the manufacturer's
recommendations and instructions shall be consulted.
4. All other preparation, decontamination,
and work
procedures used in encapsulation projects shall be requirements and
the same a those used in
removal projects.
5. Sealants used in the encapsulation shall
not alter the existing fire rating and
shall be flame resistant and meet the flame
spread and
requirements of Federal, State and Local guidelines. smoke generation
NYC-WTC 000128576
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