Figure 35. Cut H on roof A2. A small amount of rust was present in the flutes of
the steel deck.
it becomes wet has caused serious rusting of steel
ROOF A3
decks in conventional buildings. The removal of
This roof consists of a ballasted EPDM mem-
phenolic insulation from the roofing market be-
brane, perlite insulation (0.75 in. [1.9 cm]), ex-
cause of this problem attests to its very serious
panded polystyrene insulation (12 in.), perlite in-
consequences. The much retarded rate of this
sulation (0.75 in.), and a steel deck. The tempera-
chemical reaction at low temperatures has saved
ture of the freezer below this roof was 0F. Like
the steel deck on this freezer from being ruined.
adjacent roof A2 this roof contains some areas of
However since some rusting is occurring, the wet
disturbed ballast that appear to be related to
phenolic insulation in this roof must be considered a
searches for leaks. One such area is shown in the
very serious problem that requires attention. The
photograph and thermogram of Figure 36, which
manufacturer of this insulation should be deter-
mined and contacted. It may be possible to obtain
shows water ponded along the west edge of this
some financial assistance without the need to take
roof. The dark area on the thermogram is much
legal action.
bigger than the area of bare membrane where the
Table 17. Roof cut H, test results.
Moisture
Thermal resistance
content
Thickness
Density
(% of
As
After
TRR
(lb/ft3)
Insulation
(in.)
dry weight)
received
drying
(%)
PHE
3
2.9
2.8
23.0
24.4
94
PHE
3
2.8
5.2
21.8
23.4
93
Notes:
Steel deck contains a small amount of rust.
Core 20 was taken at this location.
31
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