I have decided to go with 4 inch cap blocks to make a brick ledge. I plan on using brick tabs to help hold the walls together, but I was wondering if I should put cement on the cap blocks inner face to help hold to 2 walls together or some type of construction adhesive. Are the tabs enough? There will only be 3 courses of block to get me close to grade to start the brick. The brick is only going up an additional 24 inches. This is in Nashville, TN.