Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Zambanini Adam Dante
 2. Date of Event Requiring Statement (Month/Day/Year)
02/16/2011		 3. Issuer Name and Ticker or Trading Symbol
TREX CO INC [TREX]
(Last)
(First)
(Middle)
160 EXETER DRIVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Vice President, Marketing
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WINCHESTER, VA 22603		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock (1) 157
D
 
Common Stock (2) 904
D
 
Common Stock (3) 2,000
D
 
Common Stock 815
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Appreciation Right (4) 02/18/2010 02/18/2018 Common Stock 2,729 $ 13.44 D  
Stock Appreciation Right (5) 05/07/2009 05/07/2019 Common Stock 1,119 $ 9.14 D  
Stock Appreciation Right (6) 02/21/2008 02/21/2017 Common Stock 1,219 $ 25.37 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Zambanini Adam Dante
160 EXETER DRIVE
WINCHESTER, VA 22603		       Vice President, Marketing  

Signatures

/s/ William R. Gupp by power of attorney 02/18/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) This restricted stock award vests on May 7, 2011.
(2) This restricted stock award vests in approximately two equal installments on February 18, 2011 and February 18, 2012.
(3) This restricted stock award vests over a three-year period in approximately three equal installments beginning on the first anniversary of the February 17, 2010 grant date.
(4) This stock appreciation right becomes exercisable in approximately three equal annual installments beginning on the first anniversary of the February 18, 2009 grant date.
(5) This stock appreciation right becomes exercisable in approximately three equal annual installments beginning on the first anniversary of the May 7, 2008 grant date.
(6) This stock appreciation right is fully exercisable.

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