Wood can be too wet to decay. Waterlogged wood will not allow oxygen in to support the growth of fungi. Marine pilings kept fully submerged may never rot. And wood can be too dry to decay.

How long will treated wood last underwater?

Pressure treated is guaranteed for 30 years in direct water contact, and mine has been in for 16 years.

How long does it take for wood to rot from water damage?

Lab experiments have recorded that dry rot spores can germinate approximately seven to ten days after the wood has become damp enough.