under those roofs are shown on that figure as are
the locations of all cores and cuts made on them.
Roofs D1D6 are interconnected by lower roofs
not shown in Figure 2. Figure 3 contains similar
information for the three roofs in Arlington (roofs
A1A3).
All roofs except D5 have a loose-laid ballasted
EPDM membrane. Roof D5 contains a loose-laid
ballasted Hypalon membrane. All Dallas roofs
except D7 contain an old bituminous built-up
membrane below. The new membranes were
added because the old ones were problematic. The
old membrane is directly below the Hypalon mem-
brane on roof D5. It is separated from the EPDM
membrane on roof D6 by half an inch (1.3 cm) of
wood fiber insulation and by 2 in. of expanded
polystyrene insulation on roofs D1D4. No old
membranes exist within the three Arlington roofs.
A number of different insulations exist within
these roofs: expanded polystyrene (EPS), extruded
polystyrene (XPS), isocyanurate (ISO), phenolic
(PHE), perlite (PER) fibrous glass (FGL) and wood
fiber (WOF).
Detailed information on each roof is presented
in the sections that follow.
Figure 1. Conducting nighttime on-the-roof infrared
roof moisture surveys. We found it quite valuable to
observe the roof from as high a vantage point as pos-
ROOF D1
sible.
This roof consists of a ballasted EPDM mem-
brane, expanded polystyrene insulation (2 in.), an
old bituminous built-up membrane, fibrous glass
279 ft
134 ft
F & 11*
N
D-7
(18F)
175 ft
189 ft
128 ft
190 ft
128 ft
255 ft
1
B & 3*
2
6
C & 4*
A & 8*
7
12
13
E & 5*
159 ft
10
192 ft
170 ft
D & 9*
320 ft
D-2
D-3
D-4
D-5
D-1
(0F)
(0F) (38F) (0F)
(0F)
(0F)
(0F)
Core (2 in. diameter)
D-6
Cut (12 in. 12 in.) and Core (2 in. diameter)
(0F)
*Cuts are lettered; Cores are numbered.
Figure 2. Plan view of the seven roofs examined in Dallas, Texas.
2
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