Current through Register Vol. 56, No. 18, September 16, 2024
(a)
Encapsulation products or systems to be used for lead-based paint hazard
abatement shall be warranted by the manufacturer to perform for at least 20
years.
1. Encapsulants shall meet all
applicable fire, health and environmental regulations.
2. The material safety data sheet (MSDS)
shall be obtained from the manufacturer for all encapsulants tested or
applied.
3. Residential paints and
canvas-backed vinyl wallpaper shall not be used for encapsulation of lead-based
paint unless they meet the performance requirements of this chapter.
(b) Prior to the application of
any encapsulant, a determination shall be made as to whether the surface or
component is suitable for encapsulation. Encapsulants shall not be applied to
friction or impact surfaces, deteriorated components or severely deteriorated
paint films.
1. Exception to (b) above:
Interior floor and stair surfaces may be encapsulated with a rigid floor
covering (for example, vinyl tile) that is adhesively bonded to the
surface.
2. The condition of
existing paint films shall be assessed by performing a visual evaluation,
checking for surface deterioration and determining interfacial and other film
integrity properties. Standard ASTM procedures shall be used to rate the degree
of these conditions.
(c)
Patch tests shall be performed for each surface preparation procedure and
encapsulant. A successful patch test of the surface preparation and the
encapsulant on the surface to which it will be applied shall be made before an
encapsulant is applied to a surface.
1. For
liquid-applied systems, the patch size shall be six inches by six inches. The
area prepared for the patch test shall be at least two inches larger in each
direction than the area to be encapsulated.
i. Three inch by three inch patches may be
used for fiber-reinforced wall covering and for areas where the shape of the
component makes use of a larger test patch impossible.
2. At least one test patch shall be applied
to each type of component in each room where the encapsulant is to be
used.
3. A logbook shall be kept
documenting the location, application method, wet film thickness, if
appropriate, and environmental conditions (temperature and relative humidity)
for each patch test.
4. A visual
evaluation of each patch test shall be performed and the results recorded in
the logbook. The encapsulant coating shall be inspected for wrinkling,
blistering, cracking, cratering, or bubbling.
5. An adhesive evaluation of each patch test
shall be performed using one of the following three methods and the results
recorded in the logbook.
i. "X"-Cut Method:
(1) Using a sharp cutting tool, an "X" shall
be inscribed in the center of the patch after the encapsulant system has cured
according to the manufacturer's recommendations. Each cut line shall be one and
one-half inches to two inches long and shall be made through all layers down to
the substrate.
(2) If the cut does
not go through the patch to the base substrate, a second "X" cut shall be made
in a different location.
(3) The
point of the cutting tool shall be placed at the intersection of the two cut
lines and used to attempt to peel or lift the patch from the existing topcoat.
If more than a one-half inch square portion or section of the patch can be
removed from the existing topcoat, then the encapsulant fails the patch
test.
ii. Patch edge
method:
(1) A cut shall be made adjacent to
the edge of the patch, through as thick a layer of the encapsulant as possible,
to the base substrate.
(2) If the
cut does not go through the patch to the base substrate, a second cut shall be
made in a different location.
(3)
The point of the knife shall be placed under the encapsulant at the cut,
attempting to peel or lift the patch. If more than a one-half inch square
portion or section of the patch can be removed from the existing topcoat, then
the encapsulant fails the patch test.
iii. Soundness method:
(1) A three-eighths inch by three inch bead
of construction adhesive shall be applied to the central portion of the face of
an eight inch square piece of gypsum wallboard. The wallboard shall then be
pressed onto the six inch by six inch patch. The curing time recommended by the
adhesive manufacturer shall be observed.
(2) An attempt shall be made to pull the
wallboard square away from the painted surface. If the paper backing of the
wallboard remains on the adhesive on the painted surface, the patch passes the
test.
(d) In addition to the other worksite
preparation requirements of this chapter, surface preparation shall be
performed as follows and shall replicate the surface preparation used for the
successful patch test:
1. Surfaces to be
encapsulated shall be cleaned with non-sudsy degreasers or other appropriate
cleaning products. The surface shall be rinsed thoroughly;
2. Smooth, glossy surfaces shall be roughened
as allowed by this chapter to improve adhesion as recommended by the
encapsulant manufacturer;
3. Loose
paint shall be removed by wet scraping;
4. Exposed base substrates shall be cleaned
or prepared for encapsulation as needed; and
5. Any leaks or sources of moisture shall be
eliminated. Where nonreinforced coatings are to be used, cracks shall be filled
with a caulking, patching, or sealing compound compatible with the encapsulant
and the substrate to which it is applied.
(e) Coatings shall be applied following the
manufacturer's instructions. Encapsulant application shall be performed as it
was for the successful patch test.
1.
Environmental conditions shall be as specified in the manufacturer's
instructions and shall be as close as possible to the conditions that existed
during the successful patch test.
2. Mixing and/or thinning of liquid
encapsulants shall be performed in accordance with the manufacturer's
directions.
3. Wet film thickness
gauges shall be used to ensure that liquid encapsulants are applied according
to the manufacturer's recommended thicknesses.
4. The manufacturer's instructions shall be
followed for the application of fabric if required with the use of reinforced
liquid encapsulants.
(f)
Adhesively bonded coverings shall be applied following the manufacturer's
instructions. Encapsulant application shall be performed as it was for the
successful patch test.
1. Environmental
conditions shall be as specified in the manufacturer's instructions and shall
be as close as possible to the conditions that existed during the successful
patch test.
2. Wherever possible,
permanent, clay-based adhesive shall be used.
3. Adhesively bonded floor tile shall be
installed according to the manufacturer's instructions.
(g) Following encapsulation and the curing
time specified by the manufacturer, all encapsulated surfaces and components
shall be visually inspected for signs that the encapsulant is not adhering. If
problems are noted, then appropriate corrective measures shall be
taken.
(h) In addition to the
logbook of patch test results described in (c) above, the following
documentation shall be maintained by the contractor and shall be supplied to
the building owner and to the occupant if other than the owner. This
information shall be made available at the job site upon request of the
Department:
1. The type of encapsulant used
and product name;
2. The exact
location(s) to which encapsulants were applied;
3. The product label and/or a copy of the
manufacturer's technical product information;
4. The MSDS for all products used;
5. A description of the procedures followed,
including surface preparation, environmental conditions and wet and dry film
thickness for liquid encapsulants.
6. The name, address and certification number
of the contractor;
7. The date of
application; and
8. A recommended
schedule for inspection of the encapsulated surfaces for signs of
failure.
