How to Build a Pilaster Column

Determine the dimensions of the pilasters. Base the measurement of the overall dimensions of the doorway. The pilaster consists of three pieces--a wide horizontal board and the two sides. Make the size in proportion to the doorway, such as a 12-inch width and the side boards three inches wide. Mark the width at top, middle and bottom points on each side of the door. Employ a straight edge to mark the vertical line to serve as a guide for cutting out the necessary siding material.

Use a circular saw to cut through the siding. Set the depth of the blade so that it cuts through the siding without damaging the sheathing or studs. Insert the pilaster in this space.

Determine the species of plywood used for making the pilasters, such as pine, oak or birch. Use a 3/4-inch thick sheet of plywood. Cut the horizontal board with the circular saw. Make the longer cuts for the side pieces with a table saw, if available.

Assemble the pilasters. Lay the horizontal board flat, on the edges of the side boards. Line up the outer edges of the boards and join the pieces together. Use carpenter's glue and finishing nails to bond the pieces together. Drill the nail holes and then insert the fasteners. This technique avoids splitting the wood when inserting nails.

Add cleats at the top, middle and end of the pilaster to strengthen the design. Position the pilaster against the wall. Use the level to ensure the component is straight. Secure the pilaster to the wall by inserting a finishing nail every 16 inches at an angle into the sheathing.

Finish the top of the pilaster with crown molding, such as dentil molding. Attach the baseboard. Add molding on the front of the pilaster to enhance it even more. Fill the imperfection or nail holes with an exterior-grade wood filler or spackling compound. Sand the material after it dries. Use a molding design that matches molding on the door to tie into the appearance. Finish the pilaster with paint or stain to match the rest of the doorway.