To avoid creosote buildup in your chimney, we recommend to always burn seasoned hardwood such as oak or hickory. It is best to split, stack and then allow your wood to dry for at least one year before burning. When burning wood, moisture should never bubble out of the end grain. This would indicate wet or poorly seasoned wood. Seasoned firewood ideally contents 12 to 20 percent of moisture. Do not burn plywood, particle board as well as painted or treated wood as these can give off toxic fumes. Also large amounts of paper to start a fire should be avoided because a flame could be created to reach creosote deposits and start a chimney fire.