Richard and son Ross Trethewey recap the geothermal system's installation with Norm. Tile installers Mark and Erik Ferrante lay reclaimed marble tile in the foyer and designer Keith Musinski's custom-ordered hand painted border tile in the kitchen. Kevin learns about universal design touring the Seattle home of architect Emory Baldwin. In the second half of the hour, on ASK THIS OLD HOUSE, Kevin works with an expert to make and install custom concrete countertops. Then, Richard shows how to make watertight connections without soldering. Afterward, Roger demonstrates several new cordless landscape tools.