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CORNERSTONE BUILDING BRANDS NEWS RELEASE Cornerstone Building Brands Reports Record First - Quarter 2021 Results Posted strong first - quarter net sales growth of 13.8 % , primarily from strong residential volume Generated $ 55 million of income from operations Delivered $ 139 million of Adjusted EBITDA , 42 % higher than prior year pro forma Adjusted EBITDA Achieved eighth consecutive quarter of year - over - year Adjusted EBITDA margin expansion in all segments Reduced net debt leverage ratio to 4.6x ; 0.6x better than prior year CARY , NC , May 11 , 2021 - Cornerstone Building Brands , Inc. ( NYSE : CNR ) ( the " Company " ) , the largest manufacturer of exterior building products in North America , today reported first - quarter 2021 net sales of $ 1,267.0 million and net loss of $ 1.7 million or one cent per diluted share . This compares with net sales of $ 1,113.8 million and net loss of $ 542.1 million or $ 4.30 loss per diluted share in the same quarter last year . Adjusted EBITDA¹ for the first quarter of 2021 was $ 139.1 million or 11.0 percent of net sales , an improvement of 230 basis points from the same pro forma period a year ago , with 5 percent fewer ship days . The improvement was primarily due to higher volume leverage from robust demand for residential products and benefits from cost reduction initiatives partially offset by price / mix , net of inflation . Additionally , the Company achieved its eighth consecutive quarter of year - over - year Adjusted EBITDA¹ margin expansion . " We delivered exceptional first - quarter results , achieving record growth in net sales and Adjusted EBITDA , " said James S. Metcalf , Chairman and Chief Executive Officer . " We effectively leveraged the strengths of our business model to capitalize on the strong residential end markets and navigated through the demand driven supply chain disruptions to deliver better - than expected volumes . The team's strong operational execution is positioning Cornerstone Building Brands for long - term profitable growth . " Segment Results Versus Prior Year Due to the timing of the Company's fiscal calendar , the first quarter of 2021 had three fewer ship days than the first quarter of 2020 , which was approximately 5 percent less ship days . Windows segment net sales for the quarter were $ 527.3 million , an increase of 17.6 percent from the prior - year quarter . Strong volumes across all channels of 15 percent coupled with favorable price / mix as a result of increased prices in response to rising commodity costs and other inflationary impacts drove the increase . Adjusted EBITDA¹ was $ 61.0 million or 11.6 percent of net sales , an improvement of 250 basis points . The improvement was a result of the increased volume and benefits from cost saving initiatives . Siding segment net sales for the quarter were $ 316.4 million an increase of 26.9 percent versus the pro forma¹ first quarter 2020. During the quarter , order momentum was strong as wholesale and retail demand outpaced prior year driving 19 percent higher shipped volume and slightly favorable price / mix as a result of increased prices in response to rising commodity costs and other inflationary impacts . Adjusted EBITDA¹ was $ 57.1 million or 18.1 percent of net sales , an improvement of 260 basis points . The improvement was a result of the increased volume and realized benefits from cost savings initiatives , primarily in selling , general and administrative expenses . Commercial segment net sales for the quarter were $ 423.4 million , essentially flat to the prior - year quarter due to unfavorable volume from three less ship days in the first quarter of 2021 as compared to the first quarter of 2020 partially offset by favorable price / mix as a result of increased prices in response to rising commodity costs and other inflationary impacts . Adjusted EBITDA¹ was $ 53.4 million or 12.6 percent of net sales , an improvement of 180 basis points . Manufacturing efficiencies and realized benefits from cost savings initiatives were slightly offset by $ 7 million of unfavorable price / mix , net of inflation due to the pace of rising steel costs . ( 1 ) Adjusted and pro forma financial metrics used in this release , including Adjusted EBITDA , are non - GAAP measures . See reconciliations of GAAP results to adjusted results and pro forma results in the accompanying tables . A reconciliation of the forecasted range for the second quarter of 2021 is not included in this release . See " Non - GAAP Financial Measures " below .