Treated lumber can last several years in water, typically ranging from 5 to 20 years, depending on the type of treatment used and environmental conditions. The preservatives used in treated lumber help resist decay and insect damage, but continuous exposure to water can accelerate wear. It's important to choose the right grade and type of treated lumber for specific applications, as some treatments are better suited for aquatic environments than others. Regular inspections can help determine when replacement is necessary.
Arsenic treated lumber is not being sold, but other pressure treated wood will be safe to use for your raised beds. Composite lumber and cedar lumber will both be safe and will last a long time for raised beds.
Treated lumber can last around 20-30 years in the ground, but this can vary depending on factors like the type of treatment, soil conditions, moisture levels, and exposure to elements like sunlight and insects.
Treated lumber can last anywhere from a few years to several decades underwater, depending on factors like the type of treatment used, water conditions, and exposure to marine organisms. Generally, pressure-treated wood with copper-based preservatives may last longer than untreated wood but can still degrade over time due to rot and biological activity. Regular inspections and maintenance can help extend its lifespan. In some cases, specialized treatments for aquatic environments can significantly enhance durability.
You should wait at least 6 months before painting treated lumber to allow it to fully dry and settle.
Pressure treated wood can last up to 20 years in water, depending on the type of treatment and environmental conditions.
You should wait at least 6 to 12 months before staining treated lumber to allow it to fully dry and settle.
You should typically wait at least 6 months before staining treated lumber to allow it to fully dry and settle.
Treated lumber should dry for at least 6 months before painting to ensure proper adhesion and longevity of the paint.
As long as it is not well treated
Older decks made from untreated lumber such as Douglas Fur last about 30 years. Pressure treated lumber last 50 years or longer. Redwood all heart grade or Clear Cedar can last longer than 50 years whereas the less costly knotty grades may last only 40. Hardwoods may last longer than 40 years. Man-made materials come with their own limited warranty which can range anywhere from 25 to 100 years
The best deck stain for pressure treated wood is a high-quality, oil-based stain that is specifically designed for use on pressure treated lumber. Look for a stain that offers UV protection and water resistance to ensure long-lasting durability and protection for your deck.
The new synthetics last the longest, however initial cost is much more expensive that treated lumber. If you are paying someone to build it, then in the long run it will be cheaper since it will not need replacing.