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Droopy
Lv 5
Droopy asked in Home & GardenDo It Yourself (DIY) · 2 months ago

Do I need pressure treated wood?

I'm building a bridge no wood is going in the ground it's gonna be supported by concrete blocks.  From what I read pressure treated wood only protects against rot it does nothing for water heat other elements.

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  • 1 month ago

    Assuming it will be out in the weather all the wood (not just the wood that goes into the ground) will hold up MUCH longer if it is pressure treated.

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  • james
    Lv 7
    1 month ago

    I would use poured concrete not blocks. Blocks are not that strong. Get water in them freeze & break. In truth for cost  I would use cement footing. & buy a flat bed trailer cheap to use as a bridge.  Once in place remove the tires & axels from under it. Replace boards as needed. 

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  • Anonymous
    2 months ago

    Cedar is good.  It is naturally resistant to rain so if you live on the west coast where it rains almost every day then the wood will last very well.  It does not do good in the sun. No wood does.  It won't last forever...but a few years(maybe  10).

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  • Barry
    Lv 4
    2 months ago

    You don't NEED pressure treated wood. But it will outlast untreated many times over. It's only pennies more expensive and well worth it.

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  • 2 months ago

    you need PT wood. Or else anti-water and termite wood like redwood or cypress. Ordinary wood will not resist rain and the resulting damp well, nor termites

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  • 2 months ago

    Rot is not exclusive to buried applications, so I would treat the structural wood with copper napthanate if you decide against pressure treated. Especially at the cut.ends.

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  • Anonymous
    2 months ago

    No it doesn’t need to be treated lumber, it could be cedar, redwood, teak, white oak, cypress or even mahogany. These all do very well exposed to the elements but pressure treated lumber is much more affordable

    Where the boards touch the concrete supports would be considered ground contact.

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  • 2 months ago

    Yes, Treated wood lasts 4 times longer outside in the weather than untreated wood.

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  • 2 months ago

    only a fool would use untreated ..it needs to be tanalised .it looks a greeny colour ..its put into a sealed tank ..air is withdrawn ..and the fluid passes completely through the wood ...it will not rot in 20 years years as it is ..not painted 

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  • Anonymous
    2 months ago

    I wouldn't use anything else, but obviously it is up to you. Most wood is fast grown and not at all durable unless pressure treated, and you still need to treat cut surfaces and ends.

    • Nuff Sed
      Lv 7
      2 months agoReport

      Yes. Anything resting on concrete blocks on the ground will constantly wick moisture and then rot within a few years, unless treated or if the concrete and wood have an impermeable barrier.

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