POWER OF ATTORNEY


Know all by these presents that the undersigned hereby constitutes and appoints
Frank A. Lonegro, signing  singly,  the  undersigned's  true  and  lawful
attorney-in-fact to:

execute  for  and on behalf of the undersigned, in the undersigned's capacity as
an officer and/or director of Beacon Roofing Supply, Inc. (the "Company"), Forms
3,  4  and  5 in accordance with Section 16(a) of the Securities Exchange Act of
1934 and the rules thereunder;

do  and  perform any and all acts for and on behalf of the undersigned which may
be  necessary  or  desirable  to  complete and execute any such Form 3, 4, or 5,
complete  and  execute any amendment or amendments thereto, and timely file such
form  with  the  United  States Securities and Exchange Commission and any stock
exchange or similar authority; and

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 Securities Exchange Act of 1934. 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 14th day of May, 2020.


/s/ Alan Gershenhorn
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Alan Gershenhorn