How to Build an Easy Mantelshelf

Check with your local building-code official or the fire department to determine the type of materials that comply with all ordinances in your area.

Measure the size of the intended mantelshelf. Mantels can extend to the left and right beyond the opening of the fireplace. Decide what scale fits the room, and size the mantelpiece accordingly.

Choose the proper type and size of wood depending on whether you are going to stain or paint it. Hardwoods such as oak, walnut or cherry are more suited to a stained mantelpiece. Pine or softer woods are more suitable for painted finishes.

Install 1-inch by 12-inch boards around the unfinished fireplace to serve as the foundation for the mantelshelf. Use nails long enough to penetrate the wall studs at least 1 inch deep. Fireplaces finished with rock, brick or tile do not require framing.

Cut a 1-inch by 6-inch board for the mantelshelf and nail it to the backing board using 3-inch finish nails. Level the shelf with the floor and ceiling by using wedge-shaped blocks. Drive the wedges between the backing board and the mantelshelf as necessary to adjust the level of the shelf.

Attach crown molding to the backing boards and mantelshelf. Countersink any nailheads, and fill in the holes with wood putty. It is best to use an air nailer to attach the crown molding to avoid hammer strike damage to the molding. Use 2-inch finish nails either manually nailed or installed with the air nailer.

Sand the mantel and any molding boards that are visible. Then paint or apply stain to the finished mantel.