Washington, D.C. 20549


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*

(Last) (First) (Middle)
SUITE 1600


(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Builders FirstSource, Inc. [ BLDR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
SVP & General Counsel
3. Date of Earliest Transaction (Month/Day/Year)
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, par value $0.01 per share 02/04/2019 A 10,942(1) A $0.00 256,194 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Reflects the vesting of performance-based restricted stock units granted pursuant to the Corporation's 2014 Incentive Plan.
/s/ Jeffrey A. Wier, by power of attorney 02/06/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

KNOW ALL PERSONS BY THESE PRESENTS that the undersigned hereby authorizes,
designates, and appoints Jeffrey A. Wier as such person's true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution
and full power to act, for the undersigned and in the undersigned's name, place,
and stead, to execute, acknowledge, deliver, and file any and all statements
required to be filed with the United States Securities and Exchange Commission
(the "Commission") by the undersigned pursuant to 1) Section 16 of the
Securities Exchange Act of 1934, as amended (the "1934 Act") or 2) Rule 144
promulgated under the Securities Act of 1933, as amended (the "1933 Act"), and
the rules and regulations thereunder with respect to securities of Builders
FirstSource, Inc., a Delaware corporation, including, without limitation,
statements on Form 4, Form 5 and Form 144 (and any amendments thereto) and any
successor forms adopted by the Commission, as required by the 1934 Act or the
1933 Act and the rules and regulations thereunder, and to take such other
actions as such attorneys-in-fact may deem necessary or appropriate in
connection with such statements.  

This power of attorney shall continue in effect
 until the undersigned no longer
has an obligation to file statements under Section 16 of the 1934 Act or Rule
144 under the 1933 Act, or until specifically terminated in writing by the
undersigned.  The undersigned acknowledges that the aforesaid person is not
assuming any of the undersigned's responsibilities to comply with Section 16 of
the 1934 Act or Rule 144 under the 1933 Act.

IN WITNESS WHEREOF, the undersigned has duly executed this power of attorney on
the 9th day of December, 2005.

                                         By: /s/ Donald F. McAleenan