EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We have issued our reports dated August 30, 2005, accompanying the consolidated financial statements, management’s assessment of the effectiveness of internal control over financial reporting, and schedule included in the Annual Report of ElkCorp on Form 10-K for the year ended June 30, 2005. We hereby consent to the incorporation by reference of said reports in the Registration Statements of ElkCorp on
Form S-3 (File No. 333-73196) and on Form S-8 (File No. 333-96499).

/s/ Grant Thornton LLP

Grant Thornton LLP

Dallas, Texas
August 30, 2005