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    Extend Concrete Patio – How to extend an existing …

    • Before you even start thinking of mixing any concrete, there is a lot of planning that needs to be done in order to extend a concrete patio. Will you reuse your existing concrete slab? Will you put a re-surfaci… See more

    Step 2: Prepare The Sub-Base For Your Slab Extension

    Based on the research I performed, I decided that I was going to have 4″ thick slab with a 4” sub-base of gravel. Therefore, I started excavating the area where I was going to extend my slab. After excavating … See more

    Step 3: Install Concrete Forms

    Once the sub-base of stone has been compacted, you will need to set up your “concrete forms”. For my concrete forms, I simply used a 1”x6” pieces of lumber and arranged them in a rectangle as needed to get my sha… See more

    Step 4: Install Steel Reinforcement

    Although concrete has outstanding compressive strength, it is actually quite weak when subjected to shear and tension forces. In order to compensate for this, steel rebar or wire mesh is typically added to the cent… See more

    Step 5: Mix Up and Pour Your Concrete

    Before you start mixing up your concrete, calculate the approximate amount you will need. Concrete is typically measured in cubic yards (CY). In order to calculate the CY of concrete you will need, multiply the length of yo… See more

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