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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:
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|   | a)                                                                                                                                                                                                                                                                                                                                                           
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|   | b)                                                                                                                                                                                                                                                                                                                                                           
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|   | c)                                                                                                                                                                                                                                                                                                                                                           
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|   | d)                                                                                                                                                                                                                                                                                                                                                           
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|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)                                                                                                                                                                                                                                                                                                                                                           
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|   | b)                                                                                                                                                                                                                                                                                                                                                           

Date: December 17, 2012

By: /s/Michel
DumasName: Michel DumasTitle: Chief
Financial Officer

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