Cut and Attach Internal Spacers

What happens here

Using a table saw, cut thin strips of wood to serve as internal spacers. These spacers will be attached inside the back of the mantel to create a recess that perfectly accommodates the French cleat wall mounting system. Secure these cut spacers along the top and bottom interior edges of the mantel using wood glue and small nails or screws, ensuring they are flush and evenly spaced.

Goal: Prepare the mantel for French cleat mounting