POWER OF ATTORNEY

       Know all men by these presents, that the undersigned hereby constitutes
and appoints each of
Glenn E. Bost II, Anne M. Foulkes and Greg E. Gordon, signing singly, the
undersigned's true and lawful
attorney-in-fact, to:

       (1)  prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to
the U.S. Securities and Exchange Commission (the "SEC") a Form ID, including
amendments thereto,
and any other documents necessary or appropriate to obtain codes and passwords
enabling the
undersigned to make electronic filings with the SEC of reports required by
Section 16(a) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), or any rule or regulation
of the SEC;

       (2)  execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer
and/or director of PPG Industries, Inc. (the "Company"), Forms 3, 4 and 5 in
accordance with
Section 16(a) of the Exchange Act and the rules thereunder, and any other forms
or reports the
undersigned may be required to file in connection with the undersigned's
ownership, acquisition or
disposition of securities of the Company;

	(3)  do and perform any and all acts for and on behalf of the undersigned that
may be necessary or
desirable to complete and execute any such Form 3, 4 or 5, or other form or
report, and timely file such
form or report with the SEC and any stock exchange or similar authority; and

	(4)  take any other action of any type whatsoever in connection with the
foregoing which, in the
opinion of such attorney-in-fact, may be of benefit to, in the best interest of,
or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and
conditions as such attorney-in-fact may approve in such attorney-in-fact's
discretion.

       The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and
perform any and every act and thing whatsoever requisite, necessary or proper to
be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and
purposes as the undersigned
might or could do if personally present, with full power of substitution or
revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-fact's substitute
or substitutes, shall lawfully
do or cause to be done by virtue of this Power of Attorney and the rights and
powers herein granted.  The
undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request
of the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's
responsibilities to comply with Section 16 of the Exchange Act.

	This Power of Attorney shall remain in full force and effect until the
undersigned is no longer
required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of
and transactions in
securities issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered
to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as
of this 1st day of March, 2016.


						/s/ Timothy M. Knavish

						Timothy M. Knavish