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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.

A fireplace is, by definition, an enclosed space where you burn wood or other fuel for the purpose of generating light and heat. A firepit burns wood and is much less expensive to build, but they aren’t technically a fireplace as it isn’t enclosed. An outdoor oven—commonly outdoor brick pizza ovens—often uses wood as fuel, but its primary purpose is to cook food, and you’d rarely just burn wood inside them for warmth or aesthetic reasons.

Yes, as long as the cut is clean and the brick remains structurally sound, you can reuse it. Reusing brick is especially common for landscaping, edging, and small masonry repairs. Just make sure to file down any sharp edges before handling or installing it.

The best way to clean creosote from brick is to hire a professional chimney sweep. However, you can use a creosote log to remove excess buildup between cleanings. You can also clean minor creosote buildup using dish soap or vinegar mixed with water.