The Foundry's Undersill / Utility Trim helps provide a high level of finish with its versatility and Shake and Shingle color matching. When installing under a window, soffit, or other projection it may be necessary to remove the nailing hem. Utility Trim replaces the nailing hem, securing the panel to the wall. The Foundry’s Undersill Trim is available in a variety of colors. You will need to cut the siding to fit in the wall projection trim.