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You should use cement for a chimney crown. The purpose of the chimney crown is to protect the mortar below from water damage and the effects of weather. For this reason, chimney crowns should only be made using cement. When repairing a crown, use caulks and sealants designed for cement repair rather than mortar repair.

Masonry uses units like bricks, cement blocks, and stone with mortar between them. Mortar is generally made of sand and a type of cement. Examples of masonry include the brick or stone on a house, chimney, or freestanding wall. Concrete is a mixture of water, sand, stone aggregate, and other materials, and is poured into forms or moldings. Types of concrete applications include driveways, garage and basement floors, and poured concrete walls in basements and crawl spaces.

Real stone is exactly what it sounds like: It’s real stone sourced from the earth without additives. It is durable and unique, but it’s difficult to work with because of its weight, challenge in sourcing, and high cost. Stone veneer mimics the look of real stone but is actually engineered with a mixture of Portland cement, natural minerals, and a colorant. While it’s more affordable and easier to work with, it’s less durable and may appear manufactured to the trained eye.

If your old bricks are in decent condition and you have the space to store them where they’ll be protected from the elements, keeping old bricks is often worthwhile. You’d spend anywhere from $70 to a few hundred dollars to have them removed from your property, in which case you won’t be able to use them for future projects. Holding on to old bricks in good condition means you can use them later for other DIY projects, potentially saving yourself some money on disposal and new materials down the road.