Exhibit 99.1

FOR IMMEDIATE RELEASE

HEADWATERS INCORPORATED ANNOUNCES REPURCHASE OF $24.3 MILLION OF ITS 2.50% CONVERTIBLE SUBORDINATED NOTES

SOUTH JORDAN, UTAH, MAY 8, 2013 (NYSE: HW) HEADWATERS INCORPORATED, today announced it has entered into an agreement to repurchase approximately $24.3 million in aggregate principal amount of its 2.50% Convertible Subordinated Notes due 2014 for consideration of approximately $24.7 million, including approximately $0.2 million of accrued interest through the purchase date. After the closing of the note purchases, subject to standard closing conditions, Headwaters will have $15.6 million remaining in aggregate principal amount of its 2.50% Notes.

“With this transaction, Headwaters has repurchased $39.5 million of face value of its 2.50% Notes in fiscal 2013, decreasing annual cash interest expense by $1.0 million,” stated Don P. Newman, Headwaters’ Chief Financial Officer. “We remain focused on reducing debt and strengthening our balance sheet.”

About Headwaters Incorporated

Headwaters Incorporated is improving lives through innovative advancements in construction materials through application, design, and purpose. Headwaters is a diversified growth company providing products, technologies and services to the heavy construction materials, light building products, and energy technology industries.  Through its coal combustion products, building products, and energy businesses, the Company has been able to improve sustainability by transforming underutilized resources into valuable products.  www.headwaters.com

Forward Looking Statements

Certain statements contained in this press release are forward-looking statements within the meaning of federal securities laws and Headwaters intends that such forward-looking statements be subject to the safe-harbor created thereby.  Forward-looking

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statements include Headwaters’ expectations as to the managing and marketing of coal combustion products, the production and marketing of building materials and products, the licensing of residue hydrocracking technology and catalyst sales to oil refineries, results from the sale of coal cleaning assets, the development, commercialization, and financing of new products and technologies and other strategic business opportunities and acquisitions, and other information about Headwaters.  Such statements that are not purely historical by nature, including those statements regarding Headwaters’ future business plans, the operation of facilities, the availability of feedstocks, anticipated benefits from the sale of coal cleaning assets, and the marketability of the coal combustion products, building products and catalysts, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 regarding future events and our future results that are based on current expectations, estimates, forecasts, and projections about the industries in which we operate and the beliefs and assumptions of our management.  Actual results may vary materially from such expectations.  In some cases, words such as “may,” “should,” “intends,” “plans,” “expects,” “anticipates,” “targets,” “goals,” “projects,” “believes,” “seeks,” “estimates,” “forecasts,” or variations of such words and similar expressions, or the negative of such terms, may help to identify such forward-looking statements.  In addition, any statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses, and other characterizations of future events or circumstances, are forward-looking.  In addition to matters affecting the coal combustion products, building products, and energy industries or the economy generally, factors that could cause actual results to differ from expectations stated in forward-looking statements include, among others, the factors described in the caption entitled “Risk Factors” in Item 1A in Headwaters’ Annual Report on Form 10-K for the fiscal year ended September 30, 2012, Quarterly Reports on Form 10-Q, and other periodic filings and prospectuses.

Although Headwaters believes that its expectations are based on reasonable assumptions within the bounds of its knowledge of its business and operations, there can be no assurance that our results of operations will not be adversely affected by such factors.  Unless legally required, we undertake no obligation to revise or update any forward-looking statements for any reason.  Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. Our internet address is www.headwaters.com.  There we make available, free of charge, our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and any amendments to those reports, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC.  Our reports can be accessed through the investor relations section of our web site.

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