Exhibit 99.1

Owens Corning Reports Fourth-Quarter and Full-Year 2013 Results

Full-Year Adjusted EBIT Grew by More Than 40 Percent;

Company Initiates Quarterly Dividend

TOLEDO, Ohio – February 12, 2014 – Owens Corning (NYSE: OC) today reported consolidated net sales of $5.3 billion in 2013, up from net sales of $5.2 billion in 2012.

Full-year 2013 adjusted earnings were $221 million, or $1.86 per diluted share compared to adjusted earnings of $131 million, or $1.10 per diluted share, in 2012. Net earnings in 2013 were $204 million, or $1.71 per share, compared to net loss of $19 million, or $0.16 per diluted share last year.

Fourth-quarter 2013 adjusted earnings were $52 million, or $0.44 per diluted share, compared with $13 million, or $0.11 per diluted share, during the same period one year ago. The company reported net earnings of $82 million, or $0.69 per diluted share, in the fourth quarter of 2013, compared with a net loss of $56 million, or $0.47 per diluted share, in 2012. (See Table 6 for a discussion and reconciliation of these items.)

“In 2013, our insulation business returned to profitability. This was an important achievement for our company,” said Chairman and Chief Executive Officer Mike Thaman. “We are pleased to establish a quarterly dividend as an additional mechanism to return value to our shareholders.

“All three businesses improved in 2013, benefitting from a stable and growing global economy and a recovering U.S. housing market,” Thaman added. “We expect similar growth in 2014 and we are working to maintain the momentum we established last year.”

The decision to declare a dividend conveys the confidence of the Board of Directors in the company’s long-term financial outlook and cash flow generation. The company will make an initial quarterly payment of 16 cents per common share on April 3, 2014, to shareholders of record as of March 14, 2014.

Consolidated Fourth-Quarter and Full-Year 2013 Results

Outlook

In 2014, the company expects to deliver $500 million in adjusted EBIT based on our current outlook for an improving U.S. housing market and moderate global growth.

We expect the Roofing business to deliver another strong year in 2014 and anticipate that the market will grow on new construction with flat to potentially improving re-roofing demand.

Insulation should continue to benefit from growth in U.S. residential new construction, improved pricing and operating leverage.

In Composites, the company expects recovering market conditions to drive price improvement of $20 million to $30 million. Pricing is expected to be the primary driver of EBIT growth in 2014.

The company estimates a long-term effective tax rate of 28 percent to 30 percent, and a long-term effective cash tax rate of 10 percent to 12 percent on adjusted pre-tax earnings, due to the company’s $2.2 billion U.S. tax net operating loss carryforward. The effective book tax rate for 2014 on adjusted earnings is expected to be within the long-term range.

The company expects general corporate expenses to be $120 million to $130 million in 2014. Capital expenditures in 2014 are expected to total approximately $400 million, including an estimated $65 million for the start of construction of a non-woven facility.

The cash dividend to be paid in April will mark the company’s first such payment since 2000. Future dividend declarations will be made at the discretion of the Board of Directors and will be based on such factors as the company’s earnings, financial condition, cash requirements, future prospects and other factors.

Next Earnings Announcement

First-quarter 2014 results will be announced on Wednesday, April 23, 2014.

Conference Call and Presentation

Wednesday, February 12, 2014

11 a.m. Eastern Time

All Callers

Live dial-in telephone number: U.S. and Canada 1.877.201.0168 or international +1.647.788.4901.

Entry number: 354-170-30 (Please dial in 10-15 minutes before conference call start time)

Live webcast: http://investor.owenscorning.com/investor-relations/

Telephone replay available through Feb. 19, 2014. For U.S. and Canada, call 1.855.859.2056 or international +1.404.537.3406. Conference replay number: 354-170-30

Replay of webcast also available until Feb. 12, 2015 at: http://investor.owenscorning.com/investor-relations/

Presentation

To view the slide presentation during the conference call, please log on to the live webcast at: http://investor.owenscorning.com/investor-relations/

About Owens Corning

Owens Corning (NYSE: OC) is a leading global producer of residential and commercial building materials, glass-fiber reinforcements and engineered materials for composite systems. A Fortune^® 500 company for 59 consecutive years, Owens Corning is committed to driving sustainability by delivering solutions, transforming markets and enhancing lives. In business for more than 75 years, Owens Corning is a market-leading innovator of glass-fiber technology with sales of $5.3 billion in 2013 and about 15,000 employees in 27 countries. Additional information is available at www.owenscorning.com.

This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements are subject to risks, uncertainties and other factors that may cause actual results to differ materially from those projected in these statements. Such factors include, without limitation: economic and political conditions, including; levels of residential and commercial construction activity; competitive factors; levels of global industrial production; relationships with key customers; difficulties in managing production capacity; industry and economic conditions that affect the market and operating conditions of our customers, suppliers or lenders; availability and cost of credit; our level of indebtedness; weather conditions; pricing factors; availability and cost of energy and raw materials; issues involving implementation of new business systems; new legislation or other governmental actions; our ability to use our net operating loss carry-forwards; research and development activities; foreign exchange fluctuations; interest rate movements; labor disputes; issues related to acquisitions, divestitures and joint ventures; uninsured losses; achievement of expected synergies, cost reductions and/or productivity improvements; defined benefit plan funding obligations; and, factors detailed from time to time in the company’s Securities and Exchange Commission filings. The information in this news release speaks as of February 12, 2014, and is subject to change. The company does not undertake any duty to update or revise forward-looking statements. Any distribution of this news release after that date is not intended and should not be construed as updating or confirming such information.

Owens Corning Investor Relations News

Table 1

Owens Corning and Subsidiaries

Consolidated Statements of Earnings (Loss)

(unaudited)

(in millions, except per share amounts)

Owens Corning follows the authoritative guidance referring to “Noncontrolling Interest in Consolidated Financial Statements,” effective January 1, 2009, which, among other things, changed the presentation format and certain captions of the Consolidated Statements of Earnings (Loss) and Consolidated Balance Sheets. Owens Corning uses the captions recommended by this standard in its Consolidated Financial Statements such as net earnings attributable to Owens Corning and diluted earnings per common share attributable to Owens Corning common stockholders. However, in the preceding release Owens Corning has shortened this language to net earnings and earnings per share (or a slight variation thereof), respectively.

Table 2

Owens Corning and Subsidiaries

EBIT Reconciliation Schedules

(unaudited)

For purposes of internal review of Owens Corning’s year-over-year operational performance, management excludes from net earnings attributable to Owens Corning certain items it believes are not the result of current operations. The adjusted financial measure resulting from these adjustments is used internally by Owens Corning for various purposes, including reporting results of operations to the Board of Directors, analysis of performance, and related employee compensation measures. Although management believes that these adjustments result in a measure that provides it a useful representation of its operational performance, the adjusted measure should not be considered in isolation or as a substitute for net earnings attributable to Owens Corning as prepared in accordance with accounting principles generally accepted in the United States.

Adjusting items are shown in the table below (in millions):

The reconciliation from net earnings attributable to Owens Corning to Adjusted EBIT is shown in the table below (in millions):

Table 3

Owens Corning and Subsidiaries

Consolidated Statements of Cash Flows

(unaudited)

(in millions)

Table 4

Owens Corning and Subsidiaries

Consolidated Balance Sheets

(unaudited)

(in millions)

Table 5

Owens Corning and Subsidiaries

Segment and Business Information

(unaudited)

Composites

The table below provides a summary of net sales, EBIT and depreciation and amortization expense for our Composites segment (in millions):

Building Materials

The table below provides a summary of net sales, EBIT and depreciation and amortization expense (in millions) for the Building Materials segment and our businesses within this segment.

Table 5

Owens Corning and Subsidiaries

Segment and Business Information

(unaudited)

Corporate, Other and Eliminations

The table below provides a summary of EBIT and depreciation and amortization expense for the Corporate, Other and Eliminations category (in millions):

Table 6

Owens Corning and Subsidiaries

EPS Reconciliation Schedules

(unaudited)

(in millions, except per share data)

For purposes of internal review of Owens Corning’s year-over-year operational performance, management excludes from net earnings attributable to Owens Corning certain items it believes are not the result of current operations. The adjusted financial measures resulting from these adjustments are used internally by Owens Corning for various purposes, including reporting results of operations to the Board of Directors, analysis of performance and related employee compensation measures. Although management believes that these adjustments result in measures that provide it a useful representation of its operational performance, the adjusted measures should not be considered in isolation or as a substitute for net earnings attributable to Owens Corning as prepared in accordance with accounting principles generally accepted in the United States.

A reconciliation from net earnings (loss) attributable to Owens Corning to Adjusted Earnings and a reconciliation from diluted earnings (loss) per share to adjusted diluted earnings per share are shown in the tables below: