With insulation in place it is time for the interior walls to go up. The drywall, also known as gypsum board, is nailed to the wood framing. The nails and seams are covered with a finishing compound often called “drywall mud” and tape. The goal is to create a perfectly smooth surface, where the nails and seams are invisible, making the wall look like one solid sheet. The final step is to apply a drywall texture with an air powered texture gun. Check out the Interior Walls Gallery for pictures of the process.