SPECIAL NOTE: One should utilize the method of "pouring" a deep slab, 12-18" BELOW the frost line in your area. If installing a flower planter, I would recommend using the method of leaving the joints in the base behind the brick flowerbox open. This allows the water to drain and will not cause water damage. Another option is to place a piece of PVC in the slab when poured in the area where the planter will be. This will allow a hole for drainage. I also will recommend utilizing the plastic mason flag instead of the typical aluminum mailbox flag (see below links). An 18-20" tiered concrete cap is a nice topper for a brick mailbox, but arched tops are also very popular. |