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wood for bridge

Would a 6" thick plank of pressure-treated lumber (standard Home Depot variety 6 x 6 x 12ft) be as strong as a 4" thick piece of solid oak? I need to replace the wood of a bridge on my driveway which currently consists of oak planks (4 x 10 x 12 ft).

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Re: wood for bridge

The 6x6, actual thickness 5 1/2", pressure treated pine would be stronger and it's resistant to rot and insects. Get the pressure treated pine that is rated for ground contact.

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