Can I use plywood for a deck or just to extend my flat surface space for a party?

First, you don't frame a deck with 2X4's, and you don't surface it with plywood. You have to be very careful in the planning you do, and the materials you use, or you might generate a couple of lawsuits from the next party you have on your new deck.

Also most municipalities require permits for decks. That is mainly because so many people underestimate how important it is to build as sound a structure as you would for a floor in your house.

Once you build your deck, it is important to finish it with a good sealant or stain, and it's especially important to follow the manufacturers guidelines to the letter.

The point is, don't waste your money on any materials until you have done some thorough planning, and research, and have all of your permits in hand.

you need to have a good support frame to hold that '' deck'' together and 4inch by 6inch boards for the frame will be much safer than the use of 2X4's == consider the weight that you are putting on the deck and the top priority is safety and the liability you accept by building any thing on your property .... Thompsons' Sealer can be applied with a ''garden sprayer -- 1 gallon is under $20,00 and it makes the job much easier == or == you can roll-on oil based enamel paint for good protection of the new wood ... best that you coat twice and paint both sides of the deck wood for longer lasting ...... plywood that is good one side will much easier to work and save you lots of time in prep for smooth surface ............

BASE OF THE VERTICAL STUDS

You should also get advice concerning the points where the vertical studs go into the earth.

Weather conditions impact these studs at the points where they meet the earth and they deteriorate more quickly than you would like. Cement should be added to these base-points. (Don't be creative - find out how it is done.)

Additionally they sink if not installed properly. The warping of your deck shall cause it to crack and to look ugly and also require repairs.

Do you need a building permit? Find out now. Discovering you needed on after you have built your deck can be disastrous.

IM IN CALIFORNIA