Hello, my name is Terry and I am a help expert in the building and construction field. I will do my best to answer your question. Building codes require that there be a minimum cover over reinforcing bar used to keep concrete in place. The size of bar used for your porch may vary depending on your porch size, location and local code requirements. The cover needs to be 3" minimum on any surface permanently exposed to earth or weather. The minimum cover is 1 ½" most other places. Using this as a base, you need 3" on the top surface 5/8" bar and 1 ½" below if the porch is over a void and 3" if placed on dirt. Lets assume for model that this will be over a storage area or void below. Top + Bar + Bottom 3" + 5/8" + 1 ½" = 5 1/8" minimum If your bar is ½" then 5" will suffice. If your porch is over dirt then 6 5/8" will be needed. It is always best to verify CODE SPECIFIC information with your local Building Official and/or Building Department as local laws and codes do tend to vary somewhat from jurisdiction (town) to jurisdiction (town). I hope you have found this helpful! Terry CBO
4 To 6 inches
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
A concrete slab's thickness can vary greatly depending on the application. Typically, a concrete slab varies between 500mm to thousands of millimeters.
Certain companies exist that have pumping equipment that will hydraulically lift the slab to the desired height. It's called slab jacking. Other than that, it would be best to tear out and replace the existing slab, using an adequate base material to prevent future settling.
one yard of cement will make a 8 x 10 square foot slab at 4 inches thick, that's 80 sq. feet per yard of cement at 4 inches thick.
4 To 6 inches
A large flat often thick piece of comething
Slab
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
slab
4.074 cubic yards for every foot the slab is thick.
if the slab is one inches thick, it should be 8.8 pound per squire foot.
"Slab" would be one word to describe a thick slice of meat or fish. Some may call it "steak."
18 bags (80 pounds) of quikrete for a 4 inch thick slab.
To replace a porch post mounted on a concrete slab, you will need to first remove the old post by cutting it or unscrewing it from the base. Then, you can install a new post by drilling holes into the concrete slab and securing the new post with concrete anchors or screws. Make sure the new post is level and secure before finishing the installation.
The recommended footings for a concrete slab are typically made of reinforced concrete and should be at least 6 inches thick and extend below the frost line in your area to prevent shifting or cracking.
You need to specify the slab's width and the length as well.