Quanex Building Products Corporation
Power of Attorney

       The undersigned hereby constitutes and appoints Paul Cornett, Kevin
Delaney, and Brent Korb his true and lawful attorneys-in-fact and agents,
with full power of substitution and re-substitution, for him and in his
name, place and stead, in any and all capacities, to complete and sign
all Form 3s, Form 4s and Form 5s relating to equity securities of Quanex
 Building Products Corporation and to file the same, with all exhibits
thereto or documents in connection therewith, with the Securities and
Exchange Commission, the New York Stock Exchange and Quanex Building
Products Corporation, granting to said attorney-in-fact and agent, full
power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully
to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent, or
substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

Executed this 28th day of August, 2013.


/s/ Robert R. Buck
Robert R. Buck