Table 10. Core sample findings for roof D6.
Moisture
content
Thickness
(% of
TRR
Core
Insulation
(in.)
dry weight)
(%)
Status
5
WOF
--
4
91
dry
5
PER
1
1
98
dry
5
EPS
5
0
100
dry
5
EPS
5
1
100
dry
Notes:
WOF = wood fiber
Table 11. Roof cut E, test results.
Moisture
Thermal resistance
content
Thickness
Density
(% of
As
After
TRR
(lb/ft3)
dry weight)
received
drying
(%)
Insulation
(in.)
EPS
5
1.0
0
15.1
15.0
101
EPS
5
1.0
0
14.9
14.9
100
Notes:
The 0.5-in. wood fiber and 1-in. perlite insulations above the EPS fell apart when this
sample was taken. Table 10 indicates that they were dry at adjacent core 5.
where shown in Figure 2, determined that the bot-
The thermal image of this roof was uniformly
tom 6-in. (15.2-cm) layer of expanded polystyrene
bright except for a dark (cold) band that started
(EPS) insulation was quite wet. The water and ice
along the south side of the penthouse and ran west
in it had reduced its insulating ability to about 65%
to the west side of the roof. This band is shown in
of its original value. The 1-in.-thick layer of per-
Figure 24, which is a mosaic of three thermograms.
lite insulation below was also wet and had only
The visual inspection revealed that cold water
about half of its original insulating ability. These
from refrigeration equipment at the penthouse was
two layers of frozen insulation could not be re-
draining across the roof and causing this thermal
moved in big enough pieces for testing when cut
anomaly. The uniform nature of the thermal im-
F was taken. Figure 25 shows cut F in progress.
age over the rest of this roof suggested that there
Table 13 presents test results for the EPS insula-
was no wet insulation in cut I or that it was uni-
tion removed from cut F.
formly wet. As shown in Table 12, core 11, taken
Figure 24. Thermogram showing the cold band caused by movement of cold water from refrigeration equip-
ment across roof D7, looking north.
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