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Landscape timbers can last 10 to 20 years in the ground when installed correctly. Pressure-treated timbers will last longer than non-treated ones, as pressure treatment makes the wood more rot-resistant. Wood exposed to high moisture levels or extreme temperature and weather fluctuations may not last as long as wood in drier areas with more consistent weather.

Building codes typically require handrails if your porch is 30” or more off the ground. However, it's important to check your local regulations and building codes to make sure, as this can differ depending on your location. When in doubt, check with a local porch handrail pro, who will know the local codes and be able to get permits if any are required.

Will pressure-treated wood rot? This wood could eventually suffer from rot, although it takes longer compared to untreated wood. Even though the chemicals applied to pressure-treated wood protect it, they eventually dissipate and leave the wood vulnerable. You can delay the appearance of rot in the treated wood by reducing its direct exposure to moisture and by painting it. Using fewer screws or nails in the wood—and thereby creating fewer holes in it—also delays the chances of rot forming.

How long deck boards last largely depends on the type of wood and if it's treated or not. Untreated boards last anywhere from ten to 30 years, assuming proper care and maintenance. Treated boards can last up to 50 years. Composite boards also tend to last longer than pure wood boards.