How To Build A Concrete Fireplace Mantel Shelf

How to Build a Concrete Fireplace Mantel Shelf

A concrete fireplace mantel is an elegant and durable addition to any living room. It can be customized to match any décor, and it is relatively easy to build. Here are the steps on how to build a concrete fireplace mantel shelf:

Materials You'll Need:

Concrete mix
Form lumber (2x4s or 2x6s)
Screws or nails
Rebar
Level
Trowel
Sandpaper
Concrete sealer

Instructions:

1. Build the Form:

Cut the form lumber to the desired length and width of the mantel. Assemble the form using screws or nails. Make sure that the form is level and square. The bottom of the mold should be an inch above the fireplace opening, and the sides should overhang the fireplace opening by 1/2" on each side.

2. Reinforce the Form:

Cut the rebar to the length of the mantel. Place the rebar inside the mold, spacing it evenly. This will help to strengthen the concrete.

3. Mix the Concrete:

Mix the concrete according to the manufacturer's instructions. The concrete should be a thick, pourable consistency.

4. Pour the Concrete:

Pour the concrete into the form. Use a trowel to smooth the surface. Tap the sides of the mold to release any air bubbles.

5. Allow the Concrete to Cure:

Allow the concrete to cure for at least 24 hours. During this time, keep the concrete moist by covering it with a damp cloth.

6. Remove the Form:

Once the concrete has cured, remove the form. You may need to use a hammer or chisel to break the form apart.

7. Sand the Concrete:

Use sandpaper to smooth any rough edges on the concrete. Be careful not to sand too much, as this could weaken the concrete.