EIGHTH SUPPLEMENTAL INDENTURE

Exhibit 4.9

EIGHTH SUPPLEMENTAL INDENTURE

Eighth Supplemental Indenture (this “Supplemental Indenture”), dated as of December 22, 2014, between Colorado County Sand & Gravel Co., L.L.C., a Texas limited liability company (the “Guaranteeing Subsidiary”), an indirect subsidiary of Summit Materials, LLC, a Delaware limited liability company (the “Company”), and Wilmington Trust, National Association, a national banking association, as trustee (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Company, Summit Materials Finance Corp., a Delaware corporation (the “Co-Issuer”, and together with the Company, the “Issuers”), and certain Guarantors have heretofore executed and delivered to the Trustee an Indenture (the “Indenture”), dated as of January 30, 2012, providing for the issuance of an unlimited aggregate principal amount of 10 ¹⁄₂% Senior Notes due 2020 (the “Notes”), as supplemented by that First Supplemental Indenture, dated as of March 13, 2012, as further supplemented by that Second Supplemental Indenture, dated as of January 17, 2014, as further supplemented by that Third Supplemental Indenture, dated as of February 21, 2014, as further supplemented by that Fourth Supplemental Indenture, dated as of July 30, 2014, as further supplemented by that Fifth Supplemental Indenture, dated as of September 2, 2014, as further supplemented by that Sixth Supplemental Indenture, dated as of September 8, 2014, and as further supplemented by that Seventh Supplemental Indenture, dated as of November 19, 2014;

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 all of the Issuers’ Obligations under the Notes and the Indenture on the terms and conditions set forth herein and under the Indenture (the “Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture, without the consent of the holders of the Notes.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

(2) Agreement to Guarantee. The Guaranteeing Subsidiary acknowledges that it has received and reviewed a copy of the Indenture and all other documents it deems necessary to review in order to enter into this Supplemental Indenture, and acknowledges and agrees to (i) join and become a party to the Indenture as indicated by its signature below; (ii) be bound by the Indenture, as of the date hereof, as if made by, and with respect to, the signatory hereto; and (iii) perform all obligations and duties required of a Guarantor pursuant to the Indenture. The Guaranteeing Subsidiary hereby agrees to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture, including, but not limited to, Article 10 thereof.

(3) Execution and Delivery. The Guaranteeing Subsidiary hereby agrees that the Guarantee shall remain in full force and effect notwithstanding the absence of the endorsement of any notation of such Guarantee on the Notes.

(4) No Recourse Against Others. No past, present or future director, officer, employee, incorporator, member, partner or stockholder of the Issuers or any Guaranteeing Subsidiary (other than the Issuers and the Guarantors) shall have any liability for any obligations of the Issuers or the Guarantors (including the Guaranteeing Subsidiary) under the Notes, any Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes.

(5) Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

(6) Counterparts. The parties 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. This Supplemental Indenture may be executed in multiple counterparts which, when taken together, shall constitute one instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmissions 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.

(7) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(8) The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary.

(9) Benefits Acknowledged. The Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth in the Indenture. The 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.

(10) Successors. All agreements of the Guaranteeing Subsidiary in this Supplemental Indenture shall bind its Successors, except as otherwise provided in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors.

[Signatures on following page]

2

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

[Signature Page to Eighth Supplemental Indenture]

[Signature Page to Eighth Supplemental Indenture]