In Australia, the weather conditions allow us to create and enjoy outdoor spaces for most of the year-round. Four outdoor structures—pergolas, decking, gazebos and timber balconies—a common material used is treated pine.
This timber is used due to its hardiness in harsh conditions, such as corrosive environments near the sea. Is also resists fungal problems, insects, termites and general decay. The treatment itself—either CCA (Copper Chrome Arsenate) or ACQ (Alkaline Copper Quaternary)—however, can corrode standard fasteners, and in turn the integrity of your build. That’s why you need to use the correct fasteners. To resist the copper oxide preservative, yet create a solid build, look to our range of treated pine screws.
Not sure which screws to use? Feel free to contact Allfasteners to discuss your environment and what you are building, and we’ll help you out. Purchase online now – and buy in bulk, and benefit from our tiered pricing system.
The copper oxide preservative in treated timbers, metal in its original state, naturally seeks to transfer back to a metal state. To do so, it finds the nearest metal, and draws electrons from it to start the process. When a galvanised fastener is used in treated pine, its zinc content is targeted by the copper oxide; it is then depleted of its electrons, and then accelerates into corrosion. The process is known as ‘oxidation’ – also known as ‘rusting’.
Of course, highly-saline environments—often coastal—only serve to speed this process up. And with this, comes the danger of screws failing and in turn the structure.
Treated pine screws, on the other hand, feature a coating that is especially-formulated to resist the copper in CCA and ACQ treatments. An epoxy resin, or rubberised coating, is applied to a hot-dipped galvanised fastener. The same applies to bolts used in bigger components of the structure. The resin coating—often gold in colour, to get an approximate match to the pine’s natural colour—can last up to twice as long as a standard galvanised fastener.
Screws for treated pine? If you are unsure, feel free to call Australia’s leaders For All Things Fixings: Allfasteners. Contact us.