At which point should isti-aaza be recited silently

Question
At which point should isti-aaza be recited silently
Answer
Please see the following link for the rules on the isti'aadhah including when it is read aloud and when silently.

http://www.abouttajweed.com/tajweed-rules/31-seeking-refuge-and-the-basmalah-in-recitation/16-seeking-refuge-and-saying-the-basmalah