Redwood, cypress, and cedar are termite and rot resistant. These are softwoods and may not last as long as hardwoods.
Douse the wood in a half and half bleach and oil. The termites can't eat it.
Redwood and Wolmanized Lumber
Red pine is one of the most used woods in the country. It is not naturally rot resistant, however, it can be protected and treated to ensure that is it can resist rot.
No
The disadvantages of Ash wood is that it is not as rot proof or water resistant as other hard woods. If it is left untreated, it will rot quickly.
Hemlock is not very rot resistant.
Although all wood will rot in due time but pine and oak will last longer
Titanium is highly corrosion-resistant.
Rot-Resistant WoodsA few years ago, redwood was a big no-no for anyone who cared about the environment because venerable old-growth trees were laying down their lives to become lawn furniture. Today, redwood is a renewable resource, as millions of redwood seedlings are replanted every year-about five for every tree harvested. And cedar is an even better choice since it can be forested even more easily and quickly than redwood. Both native woods are naturally rot-resistant. They are good, reasonable, non-chemical alternatives to pressure-treated wood, but they are not totally care-free, and a deck made from either redwood or cedar will still require regular maintenance. Tropical Wood AlternativesThere are other rot-resistant woods that are just coming to the American market, including ipe (also known as ironwood) and cambara. These exotic woods will last for 2o years or more with just one preservative treatment. Ask to see certification of sustainable harvesting methods before you buy any tropical wood products.* http://www.care2.com/greenliving/hit-the-deck-with-nontoxic-solutions.html
Lightweight,dimensionally stable and rot resistant
PRESSURE TREATED WOOD, CEDAR, REDWOOD
Cedar doesn't rot because it is water resistant and if it isn't sealed it will last you pretty long. It can last up to 8 years if not sealed *After "8 years" then what? Cedar rots like any other wood if you wait long enough. How long depends on factors such as how much water can get trapped where two cedar parts touch or how severely it is constantly dried out (dry rot).
Jarrah and Teak last approximately 50 years, and Jarrah is fire, rot and termite resistant, so is a good choice for durability. Other common woods used are Pine, Redwood, Roble and White Cedar. further information on the woods can be gained at http://www.outdoorlivingideas.com/woodtypes.html.