Trim-Tex’s solution to eliminating butt-joint bulges is a favorite among pro drywall finishers. Buttboard Drywall Backer is a uniquely engineered OSB plank that pulls back the edges of the cut end of the drywall, creating a tapered edge that requires far less time and far less joint compound to finish.
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For California Residents:
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov