LEDGER Also referred to as a Granite Slab or Grave Cover Ledgers can be installed on the ground, on top of Concrete Vaults or on top of Brick Tombs. Since that flat surfaces such as the tops of concrete vaults and tops of brick tombs have a greater tendency to hold moisture, harvest mildew, and sometimes crack; Ledgers are used to avoid the results of weathering elements. Cost: Ledgers cost more than concrete, however, low maintenance and durability justify the alternative.