pressure-treated wood

pressure-treated wood,

wood that has had a liquid preservative forced into it in order to protect against deterioration due to rot or insect attack. The most commonly used preservatives are chromated copper arsenate (CCA) and pentachlorophenol. In the treatment process, finished lumber is placed in large container, which is sealed and filled with the preservative solution. As the pressure in the container is increase, the preservative is forced into the lumber; the excess preservative is drained from the container and recycled. The preservative makes pressure-treated wood suitable for long-term outdoor uses where ordinary wood would soon deteriorate. Because of concerns about the possible leaching of arsenic from CCA-treated wood, the use of such wood in most residential and general consumer construction was ended beginning in 2004. Wood for these uses is now treated with ACQ (alkaline copper quat, a copper oxide–quaternary ammonium compound mixture), copper azole, disodium octaborate tetrahydrate (DOT), or other chemicals.

Pressure-treated wood

Wood that has been chemically treated to extend its life, especially when outdoors or in contact with the ground. Chromated copper arsenate was the most common pressure-treated wood until a few years ago, but has now been phased out for most applications because of health and environmental concerns. Other pressure-treating chemicals include ACQ (alkaline copper quaternary), copper azole, and sodium silicate.
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The old style pressure-treated wood contained chromium, copper, and arsenic.
Pressure-treated wood generally looks best if it's painted or stained, she said.
21 December 2017 - US-based pressure-treated wood products producer Cox Industries is selling its Residential Lumber Division assets to Virginia-based wood treater producer Culpeper Wood Preservers, the company said.
This is usually found in pressure-treated wood that are placed outdoors and exposed to weather.
PressurePlus is engineered to improve the dimensional stability and overall performance of pressure-treated wood. It penetrates the substrate to make wood UV resistant, transforms green pressure-treated lumber to a translucent brown tone, and enhances the natural brown tone of pressure-treated lumber.
Pressure-treated wood is frequently used in the construction of buildings and provides effective termite control if it is used for all wood construction and at least to the ceiling level of the first floor.
If the stoops are made of concrete, and you are concerned about their being slippery, there are metal stair treads that can actually be installed on any stairs, but my concern is that anything but concrete or pressure-treated wood may be adversely affected if the treads are exposed to the weather.
Avoid pressure-treated wood though because they contain toxic chemicals that can destroy any garden.
Its pressure-treated wood - native Alaskan yellow cedar and Douglas fir - should hold up through "generations" of visitors, van Appel said.
For many years, most outdoor structures were built with pressure-treated wood that had been soaked in chromated copper arsenate (CCA).