What Woods Are Waterproof

Redwood and Cedar. There is a good reason a lot of popular deck builders prefer to use redwood or red cedar. … Pressure-Treated Lumber. … Composite. … Tropical hardwood.

Can you submerge wood in water?

Submerged wood doesn’t decay the same way wood on the ground does, if a log is completely submerged and aquatic insects or worms don’t infest it, it can remain sound for a long period of time.

Can treated lumber be submerged in water?

Pressure treated wood can handle submersion. Many folks just pack rock around the post, so they are always in water after rain. You should be fine to go ahead and pour your concrete with no worries.