Tag Archives: creosote

14 Need-to-Know Facts about Seasoning Firewood

Firewood that has been seasonedHere are some interesting facts that will help you season your firewood for your fireplace or stove.  Seasoning your wood is critical not only for safer fires, but to reduce creosote buildup in your fireplace or stove flue pipe and to reduce pollutants into the atmosphere.  This is the second post in a series of three that will explain how to purchase, season and store your firewood.

1) Only burn seasoned firewood. Wood should be aged at least six to twelve months and sometimes longer, depending on the density of the wood, species of wood, and climate.  Soft woods only need six months whereas hard woods can sometimes take up to two years.

2) The moisture content of wood should be between 15%-20%, never to exceed 25%. Homeowners can purchase moisture meters from most hardware stores.

3) Freshly-cut wood has a moisture content of about 50%.

4) Seasoned wood will create a clear hollow sound when knocking two pieces of wood together. Non-seasoned wood will create more of a dull thud sound.

5) Moisture in the wood is held in by the bark. Removing the bark before seasoning the wood will reduce the time to age it.

6) Aged wood will be lighter in weight than regular wood because there’s less moisture.

7) Seasoned firewood will change colors. Instead of a lighter color in new wood, the seasoned firewood will appear gray or dark brown.

8) You will notice the center of the wood will crack as it ages.

9) When burning wood that hasn’t been aged long enough, not as much heat will be produced because of the loss of heat due to evaporation of moisture.

10) Don’t trust a wood supplier to be honest with how long the firewood has been aged. Firewood that hasn’t been split and/or has been just thrown into a large woodpile will not be seasoned properly.

11) Experienced wood burners will purchase firewood at least six months ahead of the season to guarantee that the wood has been aged long enough. It’s always best to buy your wood in the off-season when it will be cheaper and firewood is more plentiful.

12) Burning firewood that isn’t aged long enough will be harder to start, will create a smokier fire, will produce less heat and will create a faster build-up of creosote in the chimney flue.

13) Anytime you burn wood, creosote is created.  We chimney sweeps divide creosote buildup into three categories–Stage 1, Stage 2 and Stage 3.  Stage 1 and Stage 2 creosotes are easily removable with a normal chimney sweeping whereas Stage 3 is far more difficult to remove. Stage 3 creosote is also known as “Glazed Creosote” because of its shiny appearance and it is highly flammable and more likely to cause a chimney fire.  Glazed creosote is much more expensive to get rid of from your chimney flue lining due to the difficulty of removal.  The chances of creating Stage 3 creosote is much higher when burning unseasoned wood.

14) Seasoned wood produces less smoke and increases efficiency; therefore less pollutants into the atmosphere.


Have your chimney inspected on an annual basis and sweep if needed before using your fireplace. The best way to find a qualified chimney sweep is to go through the Chimney Safety Institute of America.

10 Need-to-Know Facts About Purchasing Firewood

Split firewoodHere are some interesting facts that will help you purchase firewood for your fireplace or stove. If you do it right, you will save money while keeping your family safe and toasty.  This is the first post in a series of three that will explain how to properly purchase, season, and store firewood.

1)  When you buy firewood at a gas station, supermarket, hardware store or big box store, you have no idea how long it’s been aged, if at all. These convenient bundles may be fine for a campfire or beach bonfire but not for your fireplace or stove. Plan ahead.

2)  Buying firewood by the bundle is the most expensive way to purchase fuel for your fireplace.

3)  The price for firewood varies dramatically from wood supplier to wood supplier and from region to region so shop around.

4) Common woods vary from region to region. As an example, here in Southern California, the most common woods are avocado, eucalyptus, pine and oak. Eucalyptus and avocado have a lot of oil in the wood so they create more creosote buildup in your fireplace or stove flue pipe. Pine, because it’s a soft wood, is great to start a fire. Once a fire is established, throw on the oak, a hard, dense wood that will give you a long-lasting, hot, clean-burning fire. Avocado, eucalyptus and pine will be less costly than oak but oak will give you a longer lasting, cleaner fire.

5) Pinyon pine, another type of wood found in the Southwest United States, as well as wood from fruit trees are also good quality firewood found here in Southern California.

6) Some chimney professionals will tell you to never burn eucalyptus or avocado woods. Both avocado and eucalyptus, because of the high oil content, can produce more creosote buildup than other woods, even if the woods are aged long enough. This creosote buildup makes it even more critical to have your chimney inspected on an annual basis as specified by the National Fire Protection Guidelines.

7) Use a reputable wood supplier. Not only will they be more honest about how long the wood has been aged but also more honest about the quantity of the firewood you purchased. If you suspect that you have been shorted by your local wood supplier, contact your weights and measures office before you use the wood.

8) Never buy or burn firewood that has been treated with stain or paint. This includes construction scraps which is treated wood. The chemicals can be toxic when burned.

9) To save money, buy unseasoned wood. An added benefit is that you’ll know for sure how long the firewood has been aged since you’ll be aging the wood yourself.

10) Buy firewood from local sources! Bringing wood from one region to another increases chances of transporting insects from their origin. Invasive species of insects can devastate the local forests where there are no natural predators or defenses to stop them. In some states, regulations and quarantines have been instituted to restrict the movement of firewood.


Be sure to have your chimney inspected before using your fireplace. It is critical to have your chimney inspected on an annual basis as specified by the National Fire Protection Guidelines which say, “Chimneys should be inspected on an annual basis and swept if necessary.” To find a qualified CSIA Certified Chimney Sweep, make sure to go through the Chimney Safety Institute of America.