Micro Reeded treated pine
Most of the timber used in pergolas is CCA micro reeded treated pine. CCA treated timber is pressure treated and designed for use in outdoor areas or areas of increased moisture or insect habitation.
CCA stands for Copper (23-25%) Chrome (38-45%) and Arsenic (30-37%). This solution is water borne and is designed to protect timber from rotting, attacks from fungus, termites and other wood boring insects.
Within the solution Copper acts as a guard against rotting and decay, Arsenic is used as a pesticide to ward off insects and Chromium is used to bind these two agents together and make the treatment insoluble, in doing so preventing the solution from leaching from the timber.
Once treated with a CCA solution pine will have a slight greenish tinge. CCA treatment will guard against decay and insects, however natural discolouration will still occur if the timber is left unpainted or unstained.
Treated timber is available in several different finishes to suit different needs. The "finish" of the timber is the appearance of the surface of the product.The most common finish for treated pine is micro-reeded or rougher headed. This is a machined finish with a finely bevelled appearance on the surface of the timber. This finish helps to smooth the appearance of any knots or imperfections in the timber and it allows for ease of painting.
In accordance with an APVMA (Australian Pesticides and Veterinary Medicines Authority) recommendation of March 2005, CCA treated timber will no longer be used in the production of:
- Garden furniture
- Picnic tables
- Exterior seating
- Children's play equipment
- Decking boards
Since CCA treated pine has been phased out for use in areas where children could come into frequent direct contact with the timber - we no longer stock any CCA decking and sell only LOSP treated handrails. We only use CCA timber for purposes that are safe and fully government approved.
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