Figure 15. Roof D3, looking south from the expansion joint that sepa-
rates it from roof D2. The bright area on the thermogram may indi-
cate the presence of wet insulation.
should be inspected closely with the goal of find-
bright areas correspond to bands of dark ballast
ing the flaw(s) where water bypassed the water-
as can be seen in the Figure 16 photograph. Core
proofing system.
10, the only sample taken on this roof, was taken
The western half of this roof contained numer-
in one of the bright areas to verify that all the
ous parallel bands of brightness when viewed with
brightness was caused by dark ballast. Its location
the infrared scanner. Figure 16 shows a photo-
is shown in Figure 2. Table 5 presents the infor-
graph and thermogram of three such bands. They
mation obtained at core 10. It verified that these
were all caused by differences in the ballast. All
bright bands were not moisture related.
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