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While hardwoods are the best woods to burn, a few types of woods should be avoided when burning. Wood that has not had time to season, or “green wood,” should be avoided. The extra water in the wood makes it smoke horribly, which is not a quality you want. Additionally, it’s best to avoid any wood that is manufactured or has been treated, including coated or sealed wood, painted wood, or pressure-treated wood. These woods have chemicals that will be released into your air when burned and can cause health problems.

Deciding when to replace your fireplace depends on its condition and your preferences. Replacements may be necessary if your fireplace shows extensive damage, safety issues, or inefficiency. Signs include deteriorating masonry, cracked firebox panels, or a faulty chimney. Aesthetic reasons, such as outdated design, can also drive replacement. Wanting something more sustainable and energy-efficient is another good reason to replace your old fireplace.

Yes, burning wood with Dutch elm disease is a safer way to dispose of it than, say, tossing it in with the rest of your yard waste, which could potentially allow it to spread to healthy trees. But it’s always a good idea to check with your local government to make sure you’re complying with any ordinances about removing diseased trees as well as burning brush piles.

You can burn wood with oak wilt, as heat from the fire destroys the fungus, and smoke won’t threaten healthy trees. However, wood of unknown origin should be burned during the dormant season—do not store wood in the warmer months for the winter season. If you harvest oak, let it dry in the sun before transporting it elsewhere.