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It is recommended that footings in the Wisconsin area be 48" for most buildings. This is because of the deep frost that can occur in harsh Wisconsin winters.
When doing any major home project like this you should always consult an experianced and qualified contractor. If you have the experience to tackle this project on your own start with checking your local city for the permit requirements and codes. Each city has certain codes as to how the deck would have to be fastened, how deep the footings have to be and the railing heights. This will give you most of the information you will need to begin planning out the deck.
Bldg code requirements vary with locale.
The usual formula is this; for every foot above ground you put 1/2 foot in the ground.
A well-constructed deck must have proper footings in order to be stable and secure. Make sure to dig your footing holes deep enough so that they are on undisturbed soil and sit below the deepest point of frost penetration. Once the holes are dug, line the bottoms with gravel for drainage, then pour concrete into the holes. The footing depth in inches divided by eight will tell you how many bags of concrete mix you need.
Footings, the concrete pads upon which foundation walls are built, must be located beneath the frost line in order to prevent a building from heaving when the ground freezes. If the site is sloped maintaining a constant elevation for the footings would either cause the footings to be above the frost line or significantly deeper than the frost line at one end of the building. Stepping the footings enables them to follow the slope of the site and remain below the frost line without going too deep under the ground. It allows the foundation wall heights to be minimized because the footings are kept as close to the surface as possible.
2days
Panasonic tape decks will give you the best deep bass for your money.
well you could make a hydro deck like hydrogedon
Depending on what part of the country you live in. In the south they are to be 2 foot deep, most generally it is 3' deep and extreme north 4' deep.
I have never used these on a deck. Personally, I like to look of straight boards in a rather simple design. I like to see the wood grains, and the look of a deep, rich stain. Deck tiles would not be something for me.
very very deep