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I'm not sure if ipe is a great choice for this, but I think it deserves an honorable mention because I've never seen insects eating it. The trouble with it would be needing to predrill holes (because it's so hard), and it's a bit more expensive than oak. Regarding insect control, use borates. That's the only think that will really work out in the long run. ...


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you could always use hemlock. it holds up well outdoors and is strong as hell


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Solid Composite Decking (plastic) (source) I've no idea of its compressive strength, but I think it'd do just fine. It is expensive though.


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Go to a drywall and metal stud distributor and get some 3-5/8" 18ga track with a g90 coating. Might get a bit of surface rust over the years but it won't rot or be eaten by pest.


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There are many species of wood that are naturally insect and moisture resistant. Redwood comes to mind. People used this for decks long before pressure treated came along. Just install it as you would PT wood with a sill plate gasket. Good luck!



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