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What is the best type of wood to use for a deck? - used deck boats for sale

I have a piece of the boat, I want to put a lid. I use 16-foot width with a layer one foot on each side (The coupon is 14 meters wide). The support will be provided in the middle of the road, the entire platform by the rays, which are supported by the landslide. What kind of wood is best for these beams, and this should be? Moreover, for all the advice on how this work is being asked better.