Understanding the Hidden Danger of Wood Ashes
It's that time of year again when we have to clean out the wood stove or fireplace. If you're like many homeowners, you wait till the ashes are so deep that they're almost coming out of the wood stove when you open the door. Many people also find that their stove burns a little better with a layer of ashes on the bottom of the stove chamber. Regardless, at some point you'll need to clean it out.
How Long Do Embers Actually Stay Hot?
What many people don't realize is just how long embers will last in an unused fireplace or wood stove. You can have un-burned fuel (charcoal) still glowing inside a pile of wood ashes long after the fire appears to be completely out. You won't see it because it's buried in the ash. What's even more alarming is that these embers can still be glowing and dangerously hot in a stove or fireplace that hasn't been active in over five days.
This means you must be extremely careful when removing ashes from your firebox or fireplace. The consequences of careless handling can be devastating.
Real-Life Tragedies: Learning from Mistakes
In 2011, a family in Connecticut was celebrating Christmas Eve when one of the household members removed the ashes from the fireplace, placed them in a paper bag, and put them in the mudroom. Tragically, the wood ashes ignited a fire in the mudroom that quickly spread throughout the house. The fire resulted in the loss of their young children and grandparents on Christmas Eve.
Another cautionary tale comes from a firefighter who shared the story of a woman who cleaned out her ashes and placed them in a metal container. She then set the metal container on her back porch, which had about 18 inches of snow on it. Hours later, a smoke detector in the house went off. She didn't smell or see smoke and assumed it was a false alarm. It wasn't until many hours later that the fire department received a call from the same house.
As it turned out, the ash bucket contained hot embers. The bucket melted through the 18 inches of snow on the deck and came to rest directly on the wooden deck surface. The smoke detector had gone off the first time because the deck was already smoldering from the hot ash container. Unfortunately, the homeowner ignored the alarm, unaware that the ashes were starting her deck on fire—even through 18 inches of snow. Over time, the bottom of the deck ignited and the fire slowly worked its way toward the house. By the time the owner realized there was a problem, the fire had worked through the ledger board under the deck and entered the basement. When firefighters arrived, the entire basement ceiling was engulfed in flames. All of this happened from ashes placed in a metal container and left on snow outside the house.
Essential Safety Guidelines for Ash Disposal
These tragic stories serve as powerful reminders to think carefully about how you safely remove and dispose of wood ashes from your fireplace. One careless mistake could have devastating consequences.
- Always assume the ashes contain active embers that are capable of starting a fire, even if you don't see visible flames.
- Use only a metal container with no holes in it—check for rust holes or damage that could allow embers to escape.
- Never place ashes inside your house. Always place them outside, away from anything connected to your home, including decks, siding, and roof overhangs.
- Keep the container away from combustible materials. Make sure there are no leaves, mulch, wood piles, or other flammable items near the ash container.
Frequently Asked Questions About Wood Ash Safety
How long can embers stay hot in ashes?
Embers can remain hot and capable of igniting a fire for more than five days after a fire has gone out. They stay hidden beneath the ash layer, making them invisible to the naked eye.
Why is a paper bag unsafe for ash disposal?
Paper bags are highly flammable and offer no protection against hot embers. Even if the bag doesn't immediately ignite, it can easily catch fire if placed near other combustible materials inside your home.
Is it safe to put ashes in a metal container on snow?
No. Hot embers can melt through snow and ignite the surface beneath it, such as a wooden deck. Snow provides a false sense of security and does not prevent fires from starting underneath the container.
Where should I place my ash container?
Place your ash container outside, away from your house, deck, garage, and any other structures. Keep it at least several feet away from leaves, mulch, wood piles, and other flammable materials.
How do I know if my ashes are completely cool?
The safest approach is to assume all ashes contain hot embers until proven otherwise. Wait at least five days after your last fire before removing ashes, and always handle them with extreme caution.
What type of metal container is best for ash storage?
Use a sturdy metal container with a tight-fitting lid and no holes, cracks, or rust damage. Inspect it regularly to ensure it remains in good condition.
How toxic is wood ash?
Wood ash is not usually highly toxic, but ash exposure can irritate your eyes, skin, nose, and lungs. Fine particles can also be harmful if you breathe them in, especially if the ashes come from treated or painted wood.
What happens if you mix vinegar with wood ash?
Vinegar reacts with the alkaline compounds in wood ash and can cause fizzing or bubbling. It may be useful for cleaning in some cases, but it should still be handled carefully because the ash can release fine particles during mixing.
