We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated November 19, 2020 relating to the financial
statements of Atkore International Group Inc. and the effectiveness of Atkore International Group Inc.’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Atkore International Group Inc. for the year ended
September 30, 2020.
/s/ Deloitte & Touche LLP
Chicago, Illinois