please help improve this article by adding citations to reliable sources . unsourced material may be challenged and removed . march 2016 learn how and when to remove this template message knauf logo knauf is a multinational family owned company based in iphofen germany well known for drywall gypsum boards originally founded in 1932 . the company is a producer of building materials and construction systems comprising construction materials for drywall construction plasterboard cement boards mineral fibre acoustic boards dry mortars with gypsum for internal plaster and cement based external plaster and insulating materials ; glass wool stone wool and other insulation materials under the company knauf insulation . it has more than 150 production sites worldwide . 1 it is one of the seven producers which hold approximately 81 % of the worldwide wallboard market georgia pacific knauf siniat national gypsum company saint gobain u.s. gypsum and yoshino gypsum co. ltd . 2 see also edit chinese drywall knauf insulation knauf usg systems references edit knauf site . knauf.com . retrieved 2012 02 23 . lafarge annual report 2007 external links edit official website retrieved from https en.wikipedia.org w index.php title knauf & oldid 718139961 categories companies based in bavariamultinational companies headquartered in germanymanufacturing companies of germanygerman brandshidden categories articles needing additional references from march 2016all articles needing additional references navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version languages deutsch fran aisitalianoportugu srom n edit links this page was last modified on 1 may 2016 at 19 29 . text is available under the creative commons attribution sharealike license ; additional terms may apply . by using this site you agree to the terms of use and privacy policy . wikipedia is a registered trademark of the wikimedia foundation inc. a non profit organization . privacy policy about wikipedia disclaimers contact wikipedia developers cookie statement mobile view