To complete a direct vent fireplace installation, first determine the best positioning for the fireplace and where the fireplace vent will run through the wall. Attach two 2-inch by 10-inch boards to make a platform in the shape of the fireplace. Place cleats on the bottom for traction, and use 3/4-inch plywood for the top. Position the fireplace, and use a small amount of stove cement or high-temperature silicone caulk to seal the starting collar.Continue Reading
Place the vent pipe over the starting collar, lock and add a gasket if required. Use a 90-degree elbow pipe, and attach it to a 9-inch straight pipe at the vent pipe. Trace the diameter of the pipe onto the wall, squared approximately 1 inch above the vent pipe. Cut a hole in both the wall and the exterior siding to accommodate the pipe and frame the opening around it. Reinstall the drywall around the frame, and add the interior firestop, insulating the area around it, as well as around the replaced drywall, with latex caulk.
Put the pipe through the firestop, and use high-temperature latex caulk to seal around it. Place the firestop and cap into the pipe from the exterior of the house. Connect the electric and gas lines. and build a frame to surround the fireplace. Leave at least 1/2 inch between the wooden frame and the fireplace on all sides. Use a 2-inch by 6-inch board to fashion a mantle the length of the support frame, and attach it with screws.
Use 2-inch by 10-inch boards to create an angled hearth frame to seal in the sides of the frame. Use drywall to cover up the wooden parts of the frame. With a trowel, apply a thin layer of acrylic stucco.Learn more about Heating & Cooling