It is the view of the writer that, the best result when fixing signage to masonry is to fix battens, then fix the sign to the battens.  Years of observation and experience have shown that due to movement of plywood “SIGNGLOSS” ™ has
  1. Sheared off concrete nails
  2. Broken tek screws
  3. Bent plyfast screws
  4. Pulled fastening from walls
  5. Resulting in buckled signs
Masonry = Brick, Block/s, Concrete

If timber battening is used the fastenings have the capability to move and give a little.  The Masonry is Hard and unforgiving, hence the shearing of fixings.  It would be advisable to NOTCH OUT the back of battens to avoid water entrapment: See Sketch

Signgloss_Fixing_to_Masonry.jpg

Fixing To Masonry