What is pressure treated wood treated with?

How should I dispose of treated wood or finished boards?

Are uncut parts made of pressure treated wood for internal use or manufactured panels such as loft boards safe to dispose of in a fireplace in the garden (not for cooking)?

I have a large number of cuts after boarding my loft and doing various other jobs, so either burn it or bring it to the top and burn something else ...

Info I should have added originally so sorry - this is the UK where restrictions on what you can do on your own property are a huge loss. For example, I can burn this stuff in my garden fire or in my chimney. I wonder if it is safe to do this.


What is it treated with? Chromium-copper-arsenate was withdrawn from circulation here. Some of the answers to this question are out of date. All smoke is also poisonous.


"Pressure treated wood for internal use" = You would normally not use pressure treated wood for internal use.


On the other hand, manufactured panels are just fancy versions of plywood or fiberboard. They probably won't burn well because of the adhesives, but as far as I know, they're not all that dangerous. (Remember that common wood smoke is not "safe" either, and exotic woods can be just as toxic as PT.)


When treated wood burns it gives off all kinds of nasty chemicals that it has treated like trivalent chromium, copper sulfate, and arsenic. Not good stuff to breathe or pump into the air. If you can't find a way to use the leftover wood, the most responsible thing is to just throw it in the dump. At the very least, they will have waste and runoff retention systems.


In the USA from the EPA:

If you need to dispose of treated wood, follow these recommendations:

  • State law prohibits the open burning of treated wood. As a rule, open burning of any kind can only take place at municipal transfer stations with a permit, whereby only clean (untreated) wood and a brush are used. Other limited open burn situations may occur in other locations, but only with approval from local authorities and usually only for clean wood and brushes, untreated wood.

  • Treated wood of all kinds can be disposed of most responsibly as follows: Homeowners involved in small projects should bring treated wood to their local landfill or transfer station and put it in the designated place (i.e. on the unclean pile of wood). Contractors, utilities and manufacturers should contract directly with a DEEP-approved bulky landfill or send it to a non-government wood burner that is appropriately equipped and allowed to burn treated wood.

  • Sawdust, shavings and small waste wood should never be composted. Treat these items as stated above.


Love # 2: Burn No way treated wood. Send it away so we can burn it in someone else's state.


@JS. That's from an EPA site specifically for Connecticut. The clarification in No. 2 is between "open burning" and "wood burner system that is adequately equipped and allowed to burn treated wood" - therefore CT must not have any licensed and equipped facilities.


@mskfisher: Agreed. I should have added a sarcasm indicator.


@JS. Ha! That's funny ... didn't even notice the first time. :) :)

Bob Jarvis

One thing that was not mentioned is that treated wood absorbs water easily and is therefore very difficult to burn. Forget about trying to burn it in an open fire, and burning it in a wood stove would likely just clog the pile with all sorts of nasty raw material. (Remember, to make creosote efficiently in your chimney, you need to burn a lot of wet stuff. Wet wood, damp cardboard, paper, trash - everything quality Ways to clog your chimney with creosote. Aitch-ee double hockey pucks yes! Bring them chimney fires! :-).


Check your city ordinances. Some cities insist that it always be treated as construction waste so they can process it separately. others have small amounts tossed in the trash (realizing homeowners will be a bit sloppy) but over a few pounds are to be confiscated; It is possible that some still ignore the problem and just dump whatever is not alive. (Insert gangsterjoke here.)

" Ask the responsible local authority "is the answer to many questions about home improvement.


When in the UK they have a local facility to get rid of bad stuff. I recently used it to get rid of asbestos that my mother had for 20 years. Everyone was panicking about what it would cost. I checked their website, wrapped them up neatly with plastic and tape, drove over there, put them in the bin, Basta. Cost nothing but the plastic bags.


I wouldn't burn pressure treated wood, the smoke would be poisonous.

You're supposed to just throw it away with normal trash. As far as I know, recyclers don't want that.