How to Build a Curved Gable

Determine the curve that you intend for your roof's fascia. Using a pencil tied to one end of a piece of string, mark off the curved line on a sheet of 3/4-inch plywood. Cut the plywood using a jigsaw and then use the same piece of plywood as your pattern to cut three more pieces of the same size and with the same curvature.

Flip the plywood piece 180 degrees so that curve goes in the opposite direction and cut four more pieces to serve as the fascia for the other side of the gable.

Place two of the pieces of plywood together and drill pilot holes into the wood. Screw the two pieces together using 2-inch wood screws. Drill additional holes from the backside and run additional screws from that side to secure the two pieces of plywood together. Repeat the process for the fascia on the opposite side of the gable.

Sand the curvature of the fascia cut to ensure that the rough edges are smoothed out and match each other throughout the length of the curve. Use a piece of sandpaper wrapped around a block of wood to achieve the desired result.

Cut notches or nicks on the curved portion of the fascia that you just sanded. This will provide something for the glue to latch hold of when you glue plywood onto the curved portion of the fascia.

Attach the first set of fascia to the exterior wall by driving nails through the fascia at the desired angle that you wish for the gable to be. Do the same for the other side so that the gable points upward toward the eventual point where the fascia will meet. For larger gables, connect the curved fascia to additional pieces of fascia that extend out to meet at the desired point.

Using 2-by-6 cuts of lumber about 12 inches long, nail the soffits for the gable roof to the fascia so that the soffits are perpendicular to the fascia piece attached to the wall. Drive nails diagonally through the 2-by-6 into the fascia.

Attach the outside fascia of the gable by nailing through the fascia into the end of each soffit. Doing so should complete the exterior look of the fascia to the gable. Repeat this step for the other half of the gable.

Measure and cut 1-foot-wide strips of 1/2-inch plywood to cover the top of the gable. Nail and glue each strip to the top of each soffitt and to the fascia attached to the wall and to the end of each soffitt.