Document:

EX-4.3

 Exhibit 4.3 

NOTE 
 May 18, 2022

 FOR VALUE RECEIVED, the undersigned (the “Borrower”), hereby promises to pay to WELLS FARGO BANK,
NATIONAL ASSOCIATION or registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of each Loan from time to time made by the Lender to the Borrower under
that certain Credit Agreement, dated as of May 18, 2022 (as amended, restated, amended and restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being
used herein as therein defined), among the Borrower, the Guarantors party thereto, the Lenders from time to time party thereto, and Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer. 

The Borrower promises to pay interest on the unpaid principal amount of each Loan from the date of such Loan until such
principal amount is paid in full, at such interest rates and at such times as provided in the Agreement. All payments of principal and interest shall be made to the Administrative Agent for the account of the Lender in Dollars in immediately
available funds at the Administrative Agent’s Office. If any amount is not paid in full when due hereunder, such unpaid amount shall bear interest, to be paid upon demand, from the due date thereof until the date of actual payment (and before
as well as after judgment) computed at the per annum rate set forth in the Agreement. 
 This Note is one of the Notes
referred to in the Agreement, is entitled to the benefits thereof and may be prepaid in whole or in part subject to the terms and conditions provided therein. Upon the occurrence and continuation of one or more of the Events of Default specified in
the Agreement, all amounts then remaining unpaid on this Note shall become, or may be declared to be, immediately due and payable all as provided in the Agreement. Loans made by the Lender shall be evidenced by one or more loan accounts or records
maintained by the Lender in the ordinary course of business. The Lender may also attach schedules to this Note and endorse thereon the date, amount and maturity of its Loans and payments with respect thereto. 

The Borrower, for itself, its successors and assigns, hereby waives diligence, presentment, protest and demand and notice of
protest, demand, dishonor and non-payment of this Note except to the extent as may otherwise be expressly set forth in the Agreement. 

Subject to Section 11.17 of the Credit Agreement, this Note may be in the form of an Electronic Record and may be
executed using Electronic Signatures (including facsimile and .pdf) and shall be considered an original, and shall have the same legal effect, validity and enforceability as a paper record.

[signature page follows] 

 THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE COMMONWEALTH OF VIRGINIA. 
  

			
	 TREX COMPANY, INC.,
 a Delaware
corporation

	
	 By: /s/ Dennis C. Schemm

                          
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
 

	Name:	 	Dennis C. Schemm
	Title:	 	Senior Vice President and Chief Financial OfficerEX-4.4

 Exhibit 4.4 

NOTE 
 May 18, 2022

 FOR VALUE RECEIVED, the undersigned (the “Borrower”), hereby promises to pay to REGIONS BANK or
registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of each Loan from time to time made by the Lender to the Borrower under that certain Credit
Agreement, dated as of May 18, 2022 (as amended, restated, amended and restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as therein
defined), among the Borrower, the Guarantors party thereto, the Lenders from time to time party thereto, and Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer. 

The Borrower promises to pay interest on the unpaid principal amount of each Loan from the date of such Loan until such
principal amount is paid in full, at such interest rates and at such times as provided in the Agreement. All payments of principal and interest shall be made to the Administrative Agent for the account of the Lender in Dollars in immediately
available funds at the Administrative Agent’s Office. If any amount is not paid in full when due hereunder, such unpaid amount shall bear interest, to be paid upon demand, from the due date thereof until the date of actual payment (and before
as well as after judgment) computed at the per annum rate set forth in the Agreement. 
 This Note is one of the Notes
referred to in the Agreement, is entitled to the benefits thereof and may be prepaid in whole or in part subject to the terms and conditions provided therein. Upon the occurrence and continuation of one or more of the Events of Default specified in
the Agreement, all amounts then remaining unpaid on this Note shall become, or may be declared to be, immediately due and payable all as provided in the Agreement. Loans made by the Lender shall be evidenced by one or more loan accounts or records
maintained by the Lender in the ordinary course of business. The Lender may also attach schedules to this Note and endorse thereon the date, amount and maturity of its Loans and payments with respect thereto. 

The Borrower, for itself, its successors and assigns, hereby waives diligence, presentment, protest and demand and notice of
protest, demand, dishonor and non-payment of this Note except to the extent as may otherwise be expressly set forth in the Agreement. 

Subject to Section 11.17 of the Credit Agreement, this Note may be in the form of an Electronic Record and may be
executed using Electronic Signatures (including facsimile and .pdf) and shall be considered an original, and shall have the same legal effect, validity and enforceability as a paper record.

[signature page follows] 

 THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE COMMONWEALTH OF VIRGINIA. 
  

			
		  	 TREX COMPANY, INC.,
 a Delaware
corporation

		
		  	By:  /s/ Dennis C. Schemm
	 	  	                                      
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                

		  	Name: Dennis C. Schemm
		  	Title: Senior Vice President and Chief Financial OfficerEX-4.5

 Exhibit 4.5 

NOTE 
 May 18, 2022

 FOR VALUE RECEIVED, the undersigned (the “Borrower”), hereby promises to pay to PNC BANK, NATIONAL
ASSOCIATION or registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of each Loan from time to time made by the Lender to the Borrower under that certain
Credit Agreement, dated as of May 18, 2022 (as amended, restated, amended and restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as
therein defined), among the Borrower, the Guarantors party thereto, the Lenders from time to time party thereto, and Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer. 

The Borrower promises to pay interest on the unpaid principal amount of each Loan from the date of such Loan until such
principal amount is paid in full, at such interest rates and at such times as provided in the Agreement. All payments of principal and interest shall be made to the Administrative Agent for the account of the Lender in Dollars in immediately
available funds at the Administrative Agent’s Office. If any amount is not paid in full when due hereunder, such unpaid amount shall bear interest, to be paid upon demand, from the due date thereof until the date of actual payment (and before
as well as after judgment) computed at the per annum rate set forth in the Agreement. 
 This Note is one of the Notes
referred to in the Agreement, is entitled to the benefits thereof and may be prepaid in whole or in part subject to the terms and conditions provided therein. Upon the occurrence and continuation of one or more of the Events of Default specified in
the Agreement, all amounts then remaining unpaid on this Note shall become, or may be declared to be, immediately due and payable all as provided in the Agreement. Loans made by the Lender shall be evidenced by one or more loan accounts or records
maintained by the Lender in the ordinary course of business. The Lender may also attach schedules to this Note and endorse thereon the date, amount and maturity of its Loans and payments with respect thereto. 

The Borrower, for itself, its successors and assigns, hereby waives diligence, presentment, protest and demand and notice of
protest, demand, dishonor and non-payment of this Note except to the extent as may otherwise be expressly set forth in the Agreement. 

Subject to Section 11.17 of the Credit Agreement, this Note may be in the form of an Electronic Record and may be
executed using Electronic Signatures (including facsimile and .pdf) and shall be considered an original, and shall have the same legal effect, validity and enforceability as a paper record.

[signature page follows] 

 THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE COMMONWEALTH OF VIRGINIA. 
  

	
	 TREX COMPANY, INC.,

a Delaware corporation

	
	 By: /s/ Dennis C. Schemm

                        
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                              

	 Name: Dennis C. Schemm

	 Title: Senior Vice President and Chief Financial Officer

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