Exhibit 12.1

USG Corporation

Ratio of Earnings to Fixed Charges

(dollars in millions)

	June 30,			Year Ended December 31,
	2013			2012			2011			2010			2009			2008
Earnings:
Pretax Income from Continuing Operations	$	26		$	(170	)	$	(410	)	$	(447	)	$	(340	)	$	(590	)
Add: Fixed Charges	101			206			211			183			167			105
Less: Interest Capitalized	(1		)	—			—			—			(3		)	(19		)
Total Earnings	$	126		$	36		$	(199	)	$	(264	)	$	(176	)	$	(504	)
Fixed charges:
Interest Expensed and Capitalized	$	97		$	197		$	201		$	174		$	153		$	102
Amortized Premiums, Discounts and Capitalized Expenses Related to Indebtedness	4			9			10			9			14			3
Total Fixed Charges	$	101		$	206		$	211		$	183		$	167		$	105
Ratio of earnings to fixed charges	1.2x			0.2x (a)			- (b)			- (c)			- (d)			- (e)

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(a) As a result of a net loss, the amount of the coverage deficiency for the year ended December 31, 2012 was $170 million.

(b) As a result of a net loss, the amount of the coverage deficiency for the year ended December 31, 2011 was $410 million.

(c) As a result of a net loss, the amount of the coverage deficiency for the year ended December 31, 2010 was $447 million.

(d) As a result of a net loss, the amount of the coverage deficiency for the year ended December 31, 2009 was $343 million.

(e) As a result of a net loss, the amount of the coverage deficiency for the year ended December 31, 2008 was $609 million.