You don't have to go through those traps if you don't want to. You can get to the adjacent rooms by going around the long way.
As galraen said, at least one of the fireball traps cannot be disarmed. But as wise grimwald suggested, there might be a way to use it to your advantage. Hint: The monsters on that level are not immune to fire, but there are ways to make one of your own characters 100% resistant to fire. Get the picture?
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Originally Posted by galraen  If I recall corectly, 85% isn't enough for a lot of traps in Durlag's Tower... |
There are quite a few that require 90 or more skill points to detect and disarm. I think there's one (but only one) that require 100. In the final chapter, there are a couple that requires 100
If Imoen makes it to 10th level, she can have 100 in Open Locks and 100 in Remove Traps. That's just about perfect.