HUD Ch. 13 Encapsulation

Question 1

The following surfaces should NOT be encapsulated

Answer 1

• Friction surfaces
• Surfaces that fail patch tests
• Surfaces with substrates or existing coatings with high level deterioration
• Surfaces in which there is known incompatibility between two existing paint layers
• Surfaces that cannot support additional weight stress due to existing paint thickness
• Metal surfaces that are prone to rust or corrosion

Question 2

The process that makes lead-based paint inaccessible by providing a barrier between the lead-based paint and the environment

Answer 2

Encapsulation

adhere to painted surface

Question 3

If existing paint film does not adhere well to other paint layers, as well as the base substrate in order for the encapsulation system not to _____

Answer 3

Fail

Question 4

Are there standards for use of encapsulants?

Answer 4

No. There are also no approved or prohibited products

Question 5

Use of a flat _______paint over an improperly prepared glossy ________enamel will likely result in an existing paint system that is not suitable for encapsulation

Answer 5

latex; oil-based

Question 6

Field compatibility testing is __________for encapsulant systems

Answer 6

essential

Question 7

Epoxies, polyurethanes, and other coatings having strong solvents are often incompatible with _______/_______, and ________ paint films

Answer 7

oil/alkyl, and latex paint films

Question 8

__________products tend to bond less successfully to glossy, smooth, chalky, dirty, or oily paint film surfaces

Answer 8

Water-based products

Question 9

When a sharp cutting tool is used to inscribe an x in the center of the patch after encapsulant has cured, and then the inspector tries to lift or peel a portion of the patch away from the top coat

Answer 9

X-Cut Adhesion Method

For testing the adhesion of the capsulant

Question 10

Patch Edge Method

Answer 10

Make a cut adjacent to the edge of the patch through to the base substrate and attempt to lift or peel the patch from the topcoat. If a large portion of the patch can be lifted, then the test fails.

Question 11

Soundness test

Answer 11

Wallboard is pressed into a patch with construction adhesive. Once cured, inspector should attempt to pull wallboard square from the painted surface.

FAIL: Adhesive is removed from surface of lead based paint or the paint film splits

PASS: Paper backing of wallboard remains on adhesive of the painted surface of the patch

Question 12

When applying encapsulant to a glossy surface, it may be necessary to _________the surface using a product or ______ _________

Answer 12

degloss; wet sanding

Question 13

In order for the encapsulant to adhere, the surface must be _________ and free of _________

Answer 13

clean; dirty and grease

Question 14

The surface must be _________prior to applying an encapsulant

Answer 14

repaired

Once the encapsulant is applied, it becomes impossible to fix a poor surface preparation or, in the case of a failure, to confirm that surface preparation was done properly

Question 15

water based systems should not be applied to substrates when temps are below _____ F or above _____F and the relative humidity is above _____%

Answer 15

40; 95; 85

Question 16

Nonreinforced liquid coatings

Answer 16

Applied with brush, roller, or spray.

Interior & exterior products

Elastomeric or rigid

Question 17

Liquid coatings reinforced with cloth, mat, fibers

Answer 17

Applied with brush, roller, spray or trowel (2 step process)

Interior and Exterior

Properties vary widley

Question 18

Materials adhered with adhesive

Answer 18

2 step install: adhesive application, encapsulant product installation

Ex : fibermat, vinyl floor tile

Question 19

Encapsulant pros

Answer 19

• REsidents may not need to be relocated
• Minimal generation of leaded dust if surface prep is minimal
• Moderate application training requirements
• Less costly and more timesaving than some other control techniques if surface prep is minimal
• wide range of product types available to meet special needs
• finish carpentry work may not be required

Question 20

Encapsulant cons

Answer 20

• Experience and info on long term durability is limited
• Use on friction surfaces is inappropriate
• Durability depends on condition of previous paint layers
• Field compatibility testing of encapsulant with particular lead based painted surface is essential (patch testing
• Encapsulant system success depends on surface prep
• Periodic monitoring and maintenance by owner is required, since lead has not been removed
• Susceptible to water damage, system failure can be extensive.
• Application may be weather and temp dependent and may require several coats
• Some systems may contain toxic ingredients