Figure 12. Photograph and thermogram of the southeast corner of roof D2, looking SE

SR98_13
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core sample findings for this roof and Table 4 pre-

the northwest corner of this roof. It was marked

sents findings for cut B. Cut B and core 3 were

with spray paint. No obvious flaw was present

taken at about the same place but far enough apart

there. Since that area was not very bright, we ex-

to experience significant differences in moisture.

pect that the EPS insulation is dry but some fro-

The EPS insulation above the old membrane was

zen fibrous glass insulation is present below the

wet at three of the four places sampled. Solar en-

old bituminous membrane.

ergy stored in the wet EPS caused this surface to

The upper couple of inches of fibrous glass in-

be warmer there when we surveyed it. The new

sulation were dry over the entire roof but, in 2 of

EPDM membrane probably is (or was) flawed

the 4 places sampled; the lower 2 to 5 in. (5 to 13

here. No obvious flaws (or patches) were detected

cm) of that insulation was full of ice. At cores 3

but some must be present. The ballast would have

and 6, where both the EPS and a portion of the

to be moved aside in this area to find them. If flaws

fibrous glass were wet, the roof had lost about half

are not found and eliminated, the amount of wet

of its insulating ability. All these problems are

within a 40- 40-ft (12.2- 12.2-m) area at the south-

EPS insulation in this roof can be expected to in-

crease. We also detected a small (2-ft [0.6-m]

east corner of this roof. Currently, as evidenced