Figure 13. Photograph and thermogram taken near the area shown in
Figure 12, looking south.
by core 12, most of the insulation in this roof is
glass insulation will melt. The meltwater would
dry.
probably run down between the seams in the con-
Leaving the wet insulation in this roof not only
crete deck. In this way, it should be possible to
reduces its insulating ability but it also accelerates
somewhat dry that insulation.
its rate of deterioration. It would be expensive to
A photograph and thermogram of the east end
remove and replace all wet EPS insulation, but this
of the expansion joint that forms the south end of
option should be considered since this insulation
roof D2 are shown in Figure 14. The insulation did
cannot can be dried out in place. The bituminous
not feel soft (i.e., wet) within the bright area of the
membrane below prevents downward drying.
thermogram. This and other evidence suggests
If this freezer is allowed to warm up and re-
that this warmth was caused by air infiltration
main warm for a few days, the ice in the fibrous
from the edge of the roof. As stated for roof D1, if
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