EX-4.2



 Exhibit 4.2 

SUPPLEMENTAL INDENTURE 

SUPPLEMENTAL INDENTURE, (this “Supplemental Indenture”) dated as of July 31, 2015, by and among the parties that are
signatories hereto as Guarantors (each a “Guaranteeing Subsidiary” and, together, the “Guaranteeing Subsidiaries”), Builders FirstSource, Inc., a Delaware corporation (the “Company”), the other
Guarantors (as defined in the Indenture referred to herein) and Wilmington Trust, National Association, a national banking association, as Trustee under the Indenture referred to below. 

W I T N E S S E T H: 

WHEREAS, each of the Company, the Guarantors and the Trustee have heretofore executed and delivered an indenture dated as of July 31,
2015 (as amended, supplemented, waived or otherwise modified, the “Indenture”), providing for the issuance of an aggregate principal amount of $700.0 million of 10.75% Senior Notes due 2023 of the Company (the
“Notes”); 
 WHEREAS, the Indenture provides that under certain circumstances a Guaranteeing Subsidiary shall execute and
deliver to the Trustee a supplemental indenture pursuant to which such Guaranteeing Subsidiary shall unconditionally guarantee, on a joint and several basis with the other Guarantors, all of the Company’s Obligations under the Notes and the
Indenture on the terms and conditions set forth herein and under the Indentures’ (the “Guarantee”); and 
 WHEREAS,
pursuant to Section 9.1 of the Indenture, the Company, any Guarantor and the Trustee are authorized to execute and deliver a supplemental indenture to add additional Guarantors, without the consent of any Holder; 

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged,
each Guaranteeing Subsidiary, the Company, the other Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

ARTICLE I 
 DEFINITIONS 

SECTION 1.1. Defined Terms. As used in this Supplemental Indenture, terms defined in the Indenture or in the preamble or recitals
hereto are used herein as therein defined. The words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and not to any
particular section hereof. 
 ARTICLE II 

AGREEMENT TO BE BOUND; GUARANTEE 

SECTION 2.1. Agreement to be Bound. Each Guaranteeing Subsidiary hereby becomes a party to the Indenture as a Guarantor and as such
will have all of the rights and be subject to all of the obligations and agreements of a Guarantor under the Indenture. 
 SECTION 2.2.
Guarantee. Each Guaranteeing Subsidiary agrees, on a joint and several basis with all the existing Guarantors, to fully, unconditionally and irrevocably Guarantee to each Holder of the Notes and the Trustee the Guaranteed Obligations pursuant
to Article X of the Indenture on a senior basis. 







 ARTICLE III 

MISCELLANEOUS 
 SECTION 3.1.
Notices. All notices and other communications to the Guaranteeing Subsidiaries shall be given c/o the Company as provided in the Indenture for notices to the Company. 

SECTION 3.2. Merger, Amalgamation and Consolidation. The Guaranteeing Subsidiaries shall not sell or otherwise dispose of all or
substantially all of its assets to, or consolidate with or merge with or into another Person (other than the Company or any Restricted Subsidiary that is a Guarantor or becomes a Guarantor concurrently with the transaction) except in accordance with
Section 4.1(f) of the Indenture. 
 SECTION 3.3. Release of Guarantee. This Guarantee shall be released in accordance with
Section 10.2 of the Indenture. 
 SECTION 3.4. Parties. Nothing expressed or mentioned herein is intended or shall be construed
to give any Person, firm or corporation, other than the Holders and the Trustee, any legal or equitable right, remedy or claim under or in respect of this Supplemental Indenture or the Indenture or any provision herein or therein contained. 

SECTION 3.5. Governing Law. This Supplemental Indenture shall be governed by, and construed in accordance with, the laws of the State
of New York. 
 SECTION 3.6. Severability. In case any provision in this Supplemental Indenture shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby and such provision shall be ineffective only to the extent of such invalidity, illegality or unenforceability.

 SECTION 3.7. Benefits Acknowledged. Each Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth
in the Indenture. Each Guaranteeing Subsidiary acknowledges that it will receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and this Supplemental Indenture and that the guarantee and waivers made by it
pursuant to this Guarantee are knowingly made in contemplation of such benefits. 
 SECTION 3.8. Ratification of Indenture; Supplemental
Indentures Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture
shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 

SECTION 3.9. The Trustee. The Trustee makes no representation or warranty as to the validity or sufficiency of this Supplemental
Indenture or with respect to the recitals contained herein, all of which recitals are made solely by the other parties hereto. 
 SECTION
3.10. Counterparts. The parties hereto may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental
Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all
purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. 

SECTION 3.11. Execution and Delivery. Each Guaranteeing Subsidiary agrees that the Guarantee shall remain in full force and effect
notwithstanding any failure to endorse on each Note a notation of any such Guarantee. 
 SECTION 3.12. Headings. The headings of the
Articles and the Sections in this Supplemental Indenture are for convenience of reference only and shall not be deemed to alter or affect the meaning or interpretation of any provisions hereof. 







 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed as of the date first above written. 
  

			
	BUILDERS FIRSTSOURCE, INC.
	as a Guarantor
		
	By:	 	 /s/ Donald F. McAleenan

	Name:	 	Donald F. McAleenan
	Title:	 	Senior Vice President and Secretary
	
	ProBuild Holdings LLC
	ProBuild Company LLC
	Pro-Build Real Estate holdings, LLC
	Builder’s Capital, LLC
	ProBuild North Transportation LLC
	Timber Roots, LLC
	 Spenard Builders Supply LLC
 as a
Guarantor

		
	By:	 	 /s/ Donald F. McAleenan

	Name:	 	Donald F. McAleenan
	Title:	 	Senior Vice President and Secretary


 [Signature Page to Supplemental Indenture] 








			
	WILMINGTON TRUST, NATIONAL ASSOCIATION,
	as Trustee
		
	By:	 	 /s/ W. Thomas Morris II

	Name:	 	W. Thomas Morris II
	Title:	 	Vice President


 [Signature Page to Supplemental Indenture]