Exhibit 99.1

Summit Materials, LLC

August 8, 2013

Summit Materials, LLC Reports Second Quarter 2013 Results

DENVER, CO - Summit Materials, LLC (“Summit Materials”) today reported financial results for the second quarter ended June 29, 2013. Notable items for the quarter include (all comparisons, unless noted, are with the prior year’s second quarter):

On April 1, 2013, Summit Materials acquired certain assets of Lafarge in Wichita, Kansas and membership interests of Westroc near Salt Lake City, Utah. These acquisitions and related transaction fees were funded through borrowings under our senior secured revolving credit facility.

Tom Hill, the CEO of Summit Materials, stated, “Summit Materials will continue to pursue acquisitions in regions of the country that allow for synergies with our current operations and areas that have promising outlooks. The market overall is showing signs of improvement in the residential and private non-residential sectors. Demand in Texas, Colorado and Utah seem poised to lead a recovery.”

Financial Results

Mr. Hill continued, “This winter’s inclement weather led to a slight decline in our revenue as compared to the first half of 2012. All of our operations were impacted by adverse weather, but the construction and paving services were most directly affected. Pricing increases across our aggregate, asphalt and ready mix products somewhat offset these declines, which is a positive indication of the opportunity in the business once demand recovers.”

“This quarter our operating margin was 5.4%, an improvement from 3.5% last year. The increased margin was largely driven by the realization of price improvement and the completion of low margin projects, including grading and structural work in the West region.”

Central Region Results

Revenue in the Central region increased 7.9% this quarter. Revenue contribution from the Lafarge acquisition offset the severe winter that lowered activity and resulted in decreased aggregate, asphalt and ready mix volumes. From a shift in product mix, asphalt prices decreased 12.4% in the first half of 2013 compared to 2012. Cement volumes increased; however, the additional sales were to a new, high-volume customer at a reduced price.

West Region Results

The West region’s revenue declined 7.1% this quarter due to colder, wetter weather, as compared to 2012, and a strategic business decision to reduce grading and structural projects. These declines were partially offset by the Westroc acquisition. Even though we had fewer sales in the region, our Adjusted EBITDA increased $5.8 million this quarter compared to the second quarter in 2012. This inverse relationship was primarily driven by higher prices in aggregates, asphalt and ready mix and improved performance in Texas due to the completion of low margin grading and structural work.

East Region Results

This quarter the East region’s revenue and Adjusted EBITDA increased $1.7 million and $1.6 million, respectively. With low margin legacy contracts behind us and the disposal of non-core businesses, the East region was able to realign its focus on its primary operations. Operating margin in the East region improved 180 basis points due to improved pricing and cost savings initiatives implemented in 2012, including organizational restructuring.

Backlog

“Compared to this time last year, our aggregate backlog is up 36% with Texas, Missouri and Kansas particularly busy. Asphalt backlogs are down slightly, but this is primarily due to a large, low-margin highway project in Austin, Texas that we inherited from an acquisition and was completed in late 2012. Excluding this project, our asphalt backlog is actually up 9%. Our ready mix and paving and construction backlogs are slightly ahead of last year. In addition, the margin imbedded in the paving and construction backlog has improved as we have exited certain non-core, low-margin businesses,” added Mr. Hill.

Liquidity and Capital Resources

Our primary sources of liquidity include cash on-hand, cash provided by our operations and amounts available for borrowing under our credit facilities. As of June 29, 2013, we had $7.7 million in cash and working capital of $124.9 million as compared to cash and working capital of $27.4 million and $114.4 million at December 29, 2012, respectively. We calculate working capital as current assets less current liabilities, excluding the current portion of long term debt and outstanding borrowings on our revolver facility.

Given the seasonality of our business, we typically experience significant fluctuations in working capital needs and balances throughout the year; these amounts are converted to cash as our operating cycle is completed each fiscal year. Our working capital requirements generally increase during the first half of the year as we build-up inventory and focus on repair and maintenance and other set-up costs for the upcoming season. Working capital levels then decrease as we wind down the construction season and enter the winter months, which is when we see significant inflows of cash from the collection of receivables during the peak months of the season.

Free cash outflow utilization, a non-GAAP measure defined as operating cash outflow less net capital expenditures, was $81.2 million and $50.2 million in the six month periods ended June 29, 2013 and June 30, 2012, respectively. Free cash outflow in 2013, as compared to 2012, was impacted by an additional $15.7 million of interest payments related to the timing and terms of our January 2012 refinancing and increased investment of $11.7 million in capital projects. In 2013, we have continued to develop an underground mine and storage dome at our cement plant in Hannibal, Missouri and are bringing a new hot mix asphalt plant on-line in Austin, Texas.

Our growth strategy contemplates future acquisitions for which we believe we have sufficient capital through committed funds from our sponsors, Blackstone Capital Partners V L.P. and Silverhawk Summit, L.P., and our borrowing capacity. Our remaining borrowing capacity on our revolving credit facility, net of $14.5 million of outstanding letters of credit, as of June 29, 2013 was $30.5 million, which is below normal levels as a result of funding the 2013 acquisitions with the revolver.

About Summit Materials, LLC

We are a leading, vertically-integrated, geographically-diverse, heavy-side building materials company. We supply aggregates, cement and related downstream products such as ready mixed concrete, asphalt paving mix, concrete products and paving and related construction services to a variety of end-uses in the U.S. construction industry, including public infrastructure projects, as well as private residential and non-residential construction. Summit has executed 27 transactions worth an enterprise value greater than $1.0 billion. Our nine operating companies make up our three distinct geographic regions that span 20 states and 23 metropolitan statistical areas.

For more information about Summit Materials, LLC refer to the Company’s website at http://www.summit-materials.com. The information contained on our website is not incorporated herein by reference.

Conference Call Information

The Company will conduct a conference call to discuss the financial results, forward-looking information and other matters at 11:00 a.m. Eastern Time (9:00 a.m. Mountain Time) on Thursday, August 8, 2013. The conference call will be recorded and archived on the Company’s website after the call.

The conference call may be accessed at:

Webcast for Q2 2013 Summit Materials Earnings Call

Non-GAAP Financial Measures

Our chief operating decision maker evaluates the performance of our segments and allocates resources to them based on several factors including a measure we call segment profit, or Adjusted EBITDA by segment. We define Adjusted EBITDA as net income (loss) before income (loss) from discontinued operations, income tax expense (benefit), interest expense and depreciation, depletion, amortization and accretion. Accretion expense is recognized on our asset retirement obligations and reflects the time value of money. Given that accretion is similar in nature to interest expense, it is treated consistently with interest expense in determining Adjusted EBITDA. Adjusted EBITDA is determined before considering the loss from discontinued operations as results from discontinued operations is not viewed by management as part of our core business when management assesses the performance of our segments or allocation of resources. Therefore, it is not included in Adjusted EBITDA.

Adjusted EBITDA reflects an additional way of viewing aspects of our business that, when viewed with our GAAP results and the accompanying reconciliations to GAAP financial measures included in the tables below, may provide a more complete understanding of factors and trends affecting our business. However, it should not be construed as being more important than other comparable GAAP measures and must be considered in conjunction with the GAAP measures. In addition, non-GAAP financial measures are not standardized; therefore, it may not be possible to compare such financial measures with other companies’ non-GAAP financial measures having the same or similar names. We strongly encourage investors to review our consolidated interim financial statements in their entirety and not rely on any single financial measure.

The reconciliation to net income (loss) is included in the tables attached to this press release.

Cautionary Statement Regarding Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans or intentions. Any and all statements made relating to our estimated and projected earnings, margins, costs, expenditures, cash flows, growth rates and financial results are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that may change at any time, and, therefore, our actual results may differ materially from those expected. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the impact of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results.

In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in our prospectus dated June 10, 2013 (the “Prospectus”), filed with the Securities and Exchange Commission (the “SEC”) in accordance with Rule 424(b) of the Securities Act of 1933, as amended, on June 10, 2013 and other filings with the SEC.

All subsequent written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by these cautionary statements.

We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Consolidated Balance Sheets

(In thousands)

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Unaudited Consolidated Statements of Operations

(In thousands)

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Unaudited Consolidated Statements of Cash Flows

(In thousands)

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Unaudited Financial Highlights

(In thousands)

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Non-GAAP Financial Measures

(In thousands)

The tables below reconcile our net income (loss) to Adjusted EBITDA and illustrate Adjusted EBITDA by segment for the three and six month periods ended June 29, 2013 and June 30, 2012.

The following table sets forth a reconciliation of free cash outflow for the six month period ended June 29, 2013 and June 30, 2012.

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Unaudited Financial Highlights

(In millions)

The following is a summary of our credit statistics: