How can I predict a surprise radroach infestation?

Occasionally, even though I haven't rushed any rooms at all, Radroach infestations will come up by surprise from rooms such as the Storage Room. This often seems to come up without any warning and leaves me having to use up some Stimpaks to heal my dwellers.
Is there any way to predict when this will happen to prepare immediately?
Best Answer
You prepare for these attacks by isolating your unused rooms.
Make sure there are no rooms beside or below these unused rooms (other than elevator, but no room should be on the other side of the elevator on the same horizontal level). Any infestations that occur will simply end on its own without spreading.
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