Do this for both the top and bottom cleats.
How to hang a wooden sign on wall.
Wood letters are a fun creative way to spice up a room allowing you to add names words or even full sentences to your wall.
Hang larger signs with screws through the face.
Attempting to use fasteners designed for wood or metal walls on a masonry or brick wall will cause the end of the fastener to heat up and dull before it makes an indentation on the material.
The hardness of brick complicates the installation of a sign on a brick wall.
Use drywall screws to drive through the sign into the wall.
After you slide the artwork on the wall mounted cleats predrill and drive some long wood screws into the sides of the bottom cleat.
You need to drill through the plaster and into the wood framing.
How to hang wooden letters on a wall.
There are a number of different ways to hang the letters up meaning you.
Most wall framings set studs every 16 inches so you should be okay to measure from there but double check with a pilot hole.
Locate and mark the studs.
Line up the sign and mark for screws before attaching as outlined above.