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.
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.
Pressure treated wood can last up to 20 years in water, depending on the type of treatment and environmental conditions.
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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
My husband and I built a deck last year. I would recommend using pre-treated lumber. It will last longer than ordinary wood. Also choose the best galvinized nails available to avoid rust.
My husband is a lumber grader and made 59,000 last year!
you dive under water
I would recommend buying the wood for your deck at Lowe's lumber yard. Make sure to purchase pre-treated wood. It will last longer and avoid having to hand treat the wood.
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.
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