Summit Materials Finance S-4 Registration of securities issued in business combination transactions

Exhibit 12

SUMMIT MATERIALS, LLC AND SUBSIDIARIES

Computation of Ratios of Earnings to Fixed Charges

	Successor												Predecessor
(in thousands)	Year Ended December 29, 2012			Year Ended December 31, 2011			Year Ended December 31, 2010			August 26, 2009 to December 31, 2009			April 1, 2009 to August 25, 2009		Year Ended March 31, 2009
Loss from continuing operations before income taxes (1)	$	(51,723	)	$	(2,906	)	$	(21,089	)	$	(5,040	)	$	5,945	$	11,381
Add (deduct)
Distributions from equity investments		817			156			—			—			—		—
(Income) loss from equity method investees		(683	)		894			656			—			—		—
Capitalized interest		(193	)		—			(433	)		—			—		—
Fixed Charges		59,438			49,218			27,262
Earnings, as defined	$	7,656		$	47,362		$	6,396		$	(5,040	)	$	5,945	$	11,381
Fixed Charges:
Interest on indebtedness and amortization of deferred financing costs	$	58,079		$	47,784		$	25,430		$	574		$	—	$	—
Capitalized interest		193			—			433			—			—		—
Portion of rental expense under operating leases representative of the interest factor		1,166			1,434			1,399			19			16		33
Total fixed charges	$	59,438		$	49,218		$	27,262		$	593		$	16	$	33
Ratio of earnings to fixed charges (2)(3)		0.1			1.0			0.2			N/A			364		341

(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 for the period from August 26, 2009 to December 31, 2009 by $5.6 million.