EP 1110-1-31
31 Aug 01
Substrate
The substrate is the material underneath the paint.
Substrates should be classified into one of six types: brick,
concrete, drywall, metal, plaster, or wood. These substrates
cover almost all-building materials that are painted and are
linked to those used in the XRF performance characteristic
sheets. For example, the concrete substrate type includes
poured concrete, precast concrete, and concrete block.
If a painted substrate is encountered that is different from
the substrate categories shown on the XRF Performance
Characteristic Sheet , select the substrate type that is most
similar in density and composition to the substrate being
tested. For example, for painted glass substrates, an
inspector should select the concrete substrate, because it has
about the same density (2.5 g/cm3) and because the major
element in both is silicon.
For components that have layers of differe nt substrates,
such as plaster over concrete, the substrate immediately
adjacent to (underneath) the painted surface should be used.
For example, plaster over concrete block is recorded as
plaster. (1995 HUD Guidelines, Chapter 7, 1997 Revision)
Target Housing
Any housing constructed prior to 1978, except housing for
the elderly or persons with disabilities (unless any one or
more children age 6 years or under resides or is expected to
reside in such housing for the elderly or persons with
disabilities) or any 0-bedroom dwelling. (40 CFR 745.223)
Testing Combination
A unique combination of room equivalent, building
component type, and substrate. (1995 or 1997 HUD
guidelines, Chapter 7, 1997 revision)
A-45
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