Lately we’re getting some people contacting us concerned that we’re using timber pallets in helping to establish some of our food gardens. They’re worried that we’re using chemically treated pallets that will leach into our soils, contaminating the plants that we eat. And fair enough – have you seen how many pallets we’re using to stabilise our earth berms??!!
Two out of three of our earth berms we’re using timber pallets to stabilise the soil and plant into.
Many, many, many pallets are finding their way off building sites and furniture store’s skip bins into our garden. This winter we’re planting our edible forest gardens into them – so we really appreciate your concern.
But fear not folks – the good news is we don’t use chemically treated pallets *at all*, only heat treated ones. Here’s a brief overview of what type of pallets are out there and how to know which ones to choose. Thanks to 1001 pallets for summarising all the facts that I’m drawing on for this particular blog.
The basics of pallet identification
Image from 1001 pallets
When you’re identifying what type of pallet you’re looking at, 1001 Pallets recommend looking for two main things:
*The IPPC Logo: if you don’t see it, don’t use it! Even if a pallet may be perfectly safe without this logo, it could also mean that it was treated with chemicals!
*The treatment code : [HT] = Heat treatment / [MB] = Methyl Bromide / [DB] = Debarked / [KD] = Kiln Dried.
We only pick up pallets with the “HT” stamp on them as seen below – this is 100% safe to use. This particular photo is from when we built of rather beautiful and highly functional chook house all from pallets and all perfectly safe for our chooks to live in.
Heat treated (HT) pallets are “built to break”, meaning they’ll start to break down within 5 years’ish as they’re not treated with any chemicals to preserve them.
[They] undergo a pest control treatment called heat treating (HT) which involves heating the pallet to a minimum core temperature of 56°C for softwoods and 60°C for hardwoods for a minimum of 30 minutes in a kiln. HT pallets are not harmful to your health.
A word of caution: If you notice liquids spilt onto the pallet, don’t use it as it could be a harmful substance you really don’t want near your veggie patch. Better to be safe than sorry and considering there’s approximately a **g’zillion** pallets out there, you can afford to be picky.
Above you can see Anton planting out comfrey roots into the pallets which will eventually take over the pallet’s role in stablising the slope with its deep tap roots. The pallets are temporary and will break down in place. We wont bother trying to remove them, instead they’ll return to the soil – much better than ending up in landfill.
What if there’s no stamp on the pallet?
While it might be fine, we say leave it – the risk of contaminating your soil is not worth the risk.
Want to know more?
If you’d like to read up more, head on over to 1001 Pallets who’ve obviously dedicated enormous hours into researching everything pallets!