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Picket fences can be made of several types of materials. Historically, wood has been the most popular material used for picket fences. This wood can be untreated, treated, or naturally insect and rot resistant. Available non-wood options include vinyl (PVC) and aluminum. [citation needed]
Composite lumber is usually more costly than normal or treated lumber, but prices have come down over the years. Composites may last longer, but the initial investment is likely to be higher. Many composites are formulated to be fade, scratch, and stain resistant, but no lumber is immune to the elements.
Laserframe is an untreated kiln-dried, chemical-free timber that the company claimed in a brochure performed similar to H1 treated pine timber. CHH collecting any outstanding brochures and destroyed them. [22]
A study has found that soil contamination due to the presence of CCA-treated wood after 45 years was minimal. [13] Many studies in less aggressive soil types show leaching to be as low as 0.5 ppm (red pine poles in service,) or up to 14 ppm (treated pine in garden beds).
Softwoods such as pine are typically much lighter and easier to process than hardwoods such as fruit tree wood. The density of softwoods ranges from 350 kg/m 3 to 700 kg/m 3, while hardwoods are 450 kg/m 3 to 1250 kg/m 3. Once dried, both consist of approximately 12% of moisture (Desch and Dinwoodie, 1996).
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Three of the processes are performed in one step, using oil (oil-heat treatment), nitrogen (Reti wood) and steam (Le-Bois Perdure). [1] The Thermo wood process consists of drying, heat treatment and finally cooling/conditioning, and takes up to 72 hours. [4]