In a SIP building, exterior wall panels are typically
a. 6 in. or 7 in. thick.
b. 51/2 in. or 6 in. thick.
c. 5 in. or 6 in. thick.
d. 4 in. or 6 in. thick.
e. 41/2 in. or 61/2 in. thick.
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