yes they need to be set in concrete. depending on your fence, one bag of concrete per post should be enough.
Post tensioning is the prestressing of a concrete member by tensioning the reinforcing tendons after the concrete has set
Posts, Auger or post-hole digger, concrete, and water to set the base(s). Cedar planks, deck screws, screw gun to make the floor(s). Gazebo kit (the easiest way to put together a gazebo).
you need to have a ''keyway''---that is a groove in the base concrete,can be cut in if concrete has set,if not set,oil a 2x4lightly(lightly) & imbed it into the base concrete flush.
You can set the joist directly into a 3 or 4 foot hole filled with concrete, however the life expectancy of the joist is about half when it does not come in contact with the ground at all. On my house I set them on metal brackets then epoxied the bracket bolt into the concrete. With pressure treated lumber this post will be "good as new" for 25 years. Depending on the area I have seen concrete ones disintegrate in 3-8 years.
You can add citric acid and sugar to stop hydration. But then the concrete is unusable and you need to throw it away.
You will need a professional concrete contractor to set a foundation for the stairs,
No, you just need an integrated head set to fit it! :)
To build an outdoor wooden or timber deck you would need to purchase the wood from a Lowe's or Home Depot. You would also need to buy a deck plan.
Start by calling your local municipal offices to find out what permits you need and what the regulations are for decks in your municipality. Some lumber stores have deck design centres with helpful staff to guide you through the process of assembling the materials you need to build your deck from your own plans, including budgeting for extras. You may also want to call some local contractors for quotes on what your particular design will cost, just to get an idea of what a professional will charge, so you can set up a realistic budget. If you don't have all the tools required for the job, consider a tool rental store for things like post hole augers, concrete mixers, automatic nailers, belt sanders and sealer applicators.
There are a number of resources out there for people looking to build a deck. However, some people need a little more than just a set of plans in order to build a great deck. Some people need step by step instructions on building a deck to make everything very clear. If you need plans for building a deck step by step, then you should specifically look for basic or "entry level" plans online.
Need to know if the set is a U.S.Mint issue Proof or Uncirculated set, please post new question.