Warnings about Preservative Treated Wood/timber
The preservation of timber/wood used to be carried out using a mixture of salts of copper sulphate, potassium dichromate and arsenic pentoxide.
The timber was pressure injected with the preservation liquid in large pressure cylinders, after which it was stacked in the yard while still wet with preservation chemicals. It was not sold till completely dry to reduce contamination.
This was fine in dry conditions, but in the wet, the chemicals could leach out, and the arsenic is transferred to the hands simply from touching the timber. If you got a splinter in your hands the would would take ages to heal.
Children, in particular, are prone to use their hands for eating without washing them first, and could get arsenic poisoning as a result. Food plants grown near decking treated in this way could accumulate sufficient chromium to cause symptoms of heavy metal poisoning in anyone eating the produce.
A family in the Antipodes (Australasia) used offcuts of this type of treated timber on their barbecue. The cooked meat killed their dog and resulted in the prolonged hospitalisation of the entire family.
Recommendations include avoiding drilling or sawing or use a dust mask if this is unavoidable. Wash thoroughly after touching such timber, and avoid use where people are likely to come into direct contact with it.
Arsenic has been banned for in wood preserving in Europe since 2006, although the current processes have been found to be less effective without the arsenic content. The replacement process uses copper and triazole biocides - an organic anti-fungal treatment commonly used to protect food crops.
NEVER burn any kind of treated timber such as old painted timber or boards, which contain formaldehyde resins (i.e. most plywoods, chipboard, and MDF). Those using copper and tiazole biocides may be burned in approved industrial incinerators only, but should not be burned in open fires or home wood burners.
Recycled Plastic Planks and Profiles do not rot and/or leach anything into the soil and are safer therefore than preservative treated wood. Kedel's recycled plastic materials are resistant to most chemicals and are safe to use in all agricultural applications or near children, animals, fish etc. without fear of toxicity or pollution. Technical specification available on request.
Click below to watch our Spey Bench Video to get a sense of what Recycled Plastic could offer you: