Be Careful With That "Seasoned" Firewood

Buying any wood this year?

We are going through a lot of wood in our stove this seasonably cold winter. I am reminded of all the poor quality or under-seasoned firewood (always promised to be "seasoned") that I purchased back before I cut my own wood. No, my pile does not look as nice as the header photo.

Nearly all of the wood I purchased before moving to the country went for ambiance in a fireplace. Now we need it for heating, saving over $1000 each year compared to running our heat pump. If you too heat with wood and are new to it, however, here's a cautionary tale.

You see every expensive bag of supermarket logs marked "seasoned," but a study from the University of Tennessee's extension service finds that claim laughable. The UT folks tested batches of store-bought logs; they found moisture content at 50% to 90% the rule. That's far too wet to burn when firewood needs to be under 20%. For most wood not kiln-dried, that means at least 9 months split and stacked dry. Many types of wood require a year or more.

What do I mean by "wet"? It's not the wetness one finds from a log sitting in the rain; instead, it's the internal moisture of green, growing wood lost as a dead log dries naturally.

For a load of maple that fell in a storm this year, mostly big branches, I chainsawed some into small logs yesterday and hauled them to the shed. Wood from the same stormfall maple that I'd cut in late spring is barely safe to burn now, but it had been split and stacked in a sunny shelter. The remaining wood left in the forest comes in at 30% moisture. I might hazard burning a bit of it in April, after checking with my moisture meter again.

I've written about this magical device before here. They run under $30 at Amazon or you can "go pro" but that's best for a wood buyer or firewood dealer.

Today I checked some seasoned wood I split and stacked a year ago. I placed the meter at the end of a white-oak log and also into its split side. Both gave low moisture. 

 

Likewise some very old pine that I mix in with my hardwoods.

 

I don't like to burn a lot of really dry wood but it's good in a mix and to start the fire.

If you buy firewood, do yourself a favor. Get a meter and be Type-A so you don't ruin your chimney. And post to your community-living groups if you find very wet "seasoned" firewood.

Stay warm and feed that stove!