2. Manufactured Wood: Plywood, particleboard, and different types of human-made wood are smaller pieces of material glued together to create a larger board. The adhesive used has toxins that will be released when it’s burned.
3. Unseasoned Wood: Unseasoned wood will have moisture still trapped and when burned creosote can build up in the chimney. Creosote catching on fire is one of the most significant causes of chimney fires.
4. Resinous Wood: Evergreens such as cedar, spruce, and pine contain resin, which is why they’re standard for Christmas trees. These trees will burn hot fast because of that resin. It will give off creosote, and the embers will pop out of the fireplace. Those embers can burn someone sitting near the hearth or the floor itself.
5. Wet Firewood: Wet firewood will smolder, never lighting completely, while it releases creosote.