This series of decks was built in two stages separated by 2 years. The
reason was that in the same year the top level decks near the house were built,
the winter brought heavy prolonged rains. The hillside all along the deck's
border collapsed in a major landside that took away 5 feet off the surface.
The landside stopped right at the decks' outer foundation supports.
These supports were 24-inch galvanized screw-in ground anchors!
I
don't think that where the ground held was just coincidental.

These showpiece decks have
been admired by many a visitor but, sadly, it is one of the last great
redwood decks that I built. Today there are better materials that just don't
require the upkeep that a deck like this takes. The owners spent at least
$4000 every two years to maintain it's pristine beauty, but eventually after
6 years the deck began to lose its ability to be restored. That's why I
don't plank decks with wood anymore.