Exhibit 12.1

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Computation of Ratio of Earnings to Fixed Charges

($ in thousands)	Year Ended December 27, 2014			Year Ended December 28, 2013			Year Ended December 29, 2012			Year Ended December 31, 2011			Year Ended December 31, 2010
Loss from continuing operations before income taxes (1)	$	(13,336	)	$	(105,798	)	$	(50,951	)	$	(1,441	)	$	(20,722	)
Add (deduct)
Distributions from equity investments		757			120			817			156			—
Loss (income) from equity method investees		(1,408	)		(1,161	)		(683	)		894			656
Capitalized interest		—			(640	)		(193	)		—			(433	)
Fixed Charges		88,570			58,419			59,438			49,218			27,262
Earnings, as defined	$	74,583		$	(49,060	)	$	8,428		$	48,827		$	6,763
Fixed Charges:
Interest on indebtedness and amortization of deferred financing costs	$	86,742		$	56,443		$	58,079		$	47,784		$	25,430
Capitalized interest		—			640			193			—			433
Portion of rental expense under operating leases representative of the interest factor		1,828			1,336			1,166			1,434			1,399
Total fixed charges	$	88,570		$	58,419		$	59,438		$	49,218		$	27,262
Ratio of earnings to fixed charges (2)(3)		0.8			N/A			0.1			1.0			0.2

(1) Represents earnings from continuing operations before adjustments for noncontrolling interests in consolidated subsidiaries.

(2) The ratio of earnings to fixed charges is determined by dividing earnings, as adjusted, by fixed charges. Fixed charges consist of interest on all indebtedness plus that portion of operating lease rentals representative of the interest factor (deemed to be 33% of operating lease rentals).

(3) Earnings were insufficient to cover fixed charges by $107.5 million for the year ended 2013.