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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.
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 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.
The best kind of water resistant picnic tables are reinforced steel or iron. These will last a long time and if treated properly will avoid rusting.
Until it is treated or turns into periodontitis.
Assuming the short ends will overlap the long ends: The long side end pieces need to be 96" long. The End pieces need to be 51" long.
A disadvantage of using laminated veneer lumber is that it may not be as sturdy as solid lumber. This is pieced together and may not last as long as real hardwood.
Pressure treated wood can last up to 20 years or more and most pressured treated wood sold in stores such as Home Depot offer a limited lifetime warranty.
how long does a water spout last
I would recommend using western red cedar wood or redwood wood because they both hold up really well in the rain or heat, regardless of the weather. Pressure treated lumber should be fine as long as you are aware of the quality and the type of wood in that specific lumber.
they can last up to 3 days in the water.