To help you finish window, door and other openings more quickly and neatly, CertainTeed now offers trimboard and J-Pocket trimboard with a grooved design similar to that of the one-piece ourside corner. The trimboard system installation consists of (A) fastening the starter flange to the wall, (B) inserting the nail hem flange into the trimboard grooves and (C) fastening the trimboard system to the wall via the nail them).

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