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Exhibit 99.8

CERTIFICATION

I, Michel Dumas, Executive Vice President, Finance and Chief
Financial Officer of Tembec Inc., certify that;

|1. | I have reviewed this Annual Report on Form 40-F of Tembec
      Inc.;                                                                                                                                                                                                                                                                                          
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|2. | Based on my knowledge, this report does not contain any
      untrue statement of a material fact or omit to state a material fact
      necessary to make the statements made, in light of the circumstances under
      which such statements were made, not misleading with respect to the period
      covered by this report;                             
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|3. | Based on my knowledge, the financial statements, and
      other financial information included in this Annual Report, fairly present
      in all material respects the financial condition, results of operations
      and cash flows of the Registrant as of, and for, the periods presented in
      this report;                                         
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|4. | The registrants other certifying officers and I are
      responsible for establishing and maintaining disclosure controls and
      procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and
      internal control over financial reporting (as defined in Exchange Act
      Rules 13a-15(f) and 15d-15(f)) for the registrant and
  have:

| | a) | Designed such disclosure controls and procedures, or
      caused such disclosure controls and procedures to be designed under our
      supervision, to ensure that material information relating to the
      registrant, including its consolidated subsidiaries, is made known to us
      by others within those entities, particularly during the period in which
      this report is being prepared;
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| | b) | Designed such internal control over financial reporting,
      or caused such internal control over financial reporting to be designed
      under our supervision, to provide reasonable assurance regarding the
      reliability of financial reporting and the preparation of financial
      statements for external purposes in accordance with generally accepted
      accounting principles:       
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| | c) | Evaluated the effectiveness of the registrants
      disclosure controls and procedures and presented in this report our
      conclusions about the effectiveness of the disclosure controls and
      procedures, as of the end of the period covered by this report based on
      such evaluation; and                                                                                                 
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| | d) | Disclosed in this report any change in the registrants
      internal control over financial reporting that occurred during the period
      covered by the annual report that has materially affected, or is
      reasonably likely to materially affect, the registrants internal control
      over financial reporting; and                                                                          

|5. | The registrants other certifying officers and I have
      disclosed, based on our most recent evaluation of internal control over
      financial reporting, to the registrants auditors and the audit committee
      of registrants board of directors (or persons performing the equivalent
      functions):
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| | a) | All significant deficiencies and material weaknesses in
      the design or operation of internal controls over financial reporting
      which are reasonably likely to adversely affect the registrants ability
      to record, process, summarize and report financial information;
  and
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| | b) | Any fraud, whether or not material, that involves
      management or other employees who have a significant role in the
      registrants internal control over financial
reporting.                                                                                                        

Date: December 16, 2013

By: *(s) Michel Dumas*Name: Michel DumasTitle: Executive Vice President, Finance and Chief Financial
Officer

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