# chimneys **URL:** \ **Category:** Factual Questions\ **Created:** [February 18, 2001, 6:53am UTC](https://boards.straightdope.com/t/chimneys/54964 "2001-02-18T06:53:27Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mmmiiikkkeee](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@mmmiiikkkeee](https://boards.straightdope.com/u/mmmiiikkkeee)\ **Post date:** [February 18, 2001, 6:53am UTC](https://boards.straightdope.com/t/chimneys/54964/1 "2001-02-18T06:53:27Z")
I’ve been told (although by an idiot) that you can prevent creasote build-up in chimeys on wood stoves by putting a tin can in the fire. I’ve also heard of putting aluminum cans in too. Seems to me you’d just end up with a hot can - is there any logic to back this up? ---
**Author:** ![Gnarly\_Narly\_Dude](https://avatars.discourse-cdn.com/v4/letter/g/858c86/32.png) [@Gnarly\_Narly\_Dude](https://boards.straightdope.com/u/Gnarly_Narly_Dude)\ **Post date:** [February 18, 2001, 9:26am UTC](https://boards.straightdope.com/t/chimneys/54964/2 "2001-02-18T09:26:44Z")
There _are_ things that will loosen creosote, but I never heard of a can doing it. There are chemicals you can get in the hardware stores to put on a fire. I believe the primary chemical is lye soap, which acts just like Drano on drain scum. ---
**Author:** ![AskNott](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/asknott/32/5790_2.png) [@AskNott](https://boards.straightdope.com/u/AskNott)\ **Post date:** [February 18, 2001, 4:55pm UTC](https://boards.straightdope.com/t/chimneys/54964/3 "2001-02-18T16:55:41Z")
Last this question came up, I asked my friend Ray, who for several years worked as “the tallest chimney sweep in the USA.” He told me that aluminum cans are one of a handful of rural legend creosote cures. None of them work, he said. The only grain of truth is that aluminum won’t melt in the heat of the usual wood fire. If you are running your fire box hot enough to melt aluminum (not a really good idea,) you probably won’t have a creosote problem anyway. Get your chimney cleaned at least once a year if you use your wood stove regularly. It’s easier and cheaper than a house fire. ---
**Author:** ![Duck\_Duck\_Goose](https://avatars.discourse-cdn.com/v4/letter/d/50afbb/32.png) [@Duck\_Duck\_Goose](https://boards.straightdope.com/u/Duck_Duck_Goose)\ **Post date:** [February 18, 2001, 11:25pm UTC](https://boards.straightdope.com/t/chimneys/54964/4 "2001-02-18T23:25:27Z")
Okay, WAG here. You’re talking about a wood stove, right? With the firebox? One of the ways you can prevent creosote buildup is by always having hot fires. [http://muextension.missouri.edu/xplor/agguides/agengin/g01731.htm](http://muextension.missouri.edu/xplor/agguides/agengin/g01731.htm) > [@](#): > > Use a proper amount of fuel (wood) — not enough to cause overheating, but enough to maintain a flue temperature that prevents the accumulation of creosote residues. > The best way to control creosote is to prevent its buildup by maintaining a briskly burning fire with dry, well-seasoned wood. Maintain a flue temperature exceeding 250 degrees F to prevent creosote condensation. When you start a fire in a wood stove, to get the best results, you don’t just dump an armload of wood in there and toss in a match. > [@](#): > > Light the wood and paper in the grate. When the kindling is burning, add additional seasoned wood to build up a hotter fire. Be careful at first when adding wood to avoid smothering the fire. Maybe if you’re working around a tin can that’s in there in the firebox, you’re going to pay more attention to how you lay your fire. Also, maybe it makes you separate the pieces of wood, thus making the fire burn better, and hotter, because there’s more oxygen. So because the fire is burning hotter, there’s less creosote buildup in your stovepipe. Alternatively, maybe the point was to have the fire hot enough to melt the tin can. A hot fire discourages creosote buildup. [http://members.nbci.com/book\_archive/1/metal/mtal02.htm](http://members.nbci.com/book_archive/1/metal/mtal02.htm) > [@](#): > > The discovery of each of these metals predated recorded history. They are listed in order of increasing smelting temperature. Mercury, tin, and lead are quite easy to smelt. Campfire temperatures are all that are needed. It’s my understanding that aluminum can’t be smelted in anything less than industrial conditions, but maybe the rural folks just transferred the “tin can” factoid to aluminum cans when they came on the scene.