Can you add concrete to existing concrete?
Yes, you may pour a concrete pad overlay over an existing slab. You need to consider the added height and weight of the overlay on the existing structure. Overlays may include polymers, portland cement concrete, or epoxies. … You should improve the drainage of the slab by having a good slope on the overlay.
How thick should a concrete base be for a garage?
The standard concrete garage floor is six inches thick and, with use of proper control joints, should be thick enough to withstand normal use.
Can you pour concrete over dirt?
Pour concrete over a solid, well-drained base
Because concrete slabs “float” on the soil, soft ground or voids underneath may cause unsupported areas to crack under heavy weight like vehicles. Pack about 4 in. of sand or gravel over clay and other poorly draining soils to provide even support.
Can I pour a 2 inch concrete slab?
A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. … The thinner applications would include drives, walkways, slabs and footers, just to name a few. With this type of application, both a fine and coarse aggregate are required.
Does a garage floor need to be sloped?
in South Bend, Ind., and member of the board of directors for the American Society of Concrete Contractors, responds: A garage floor does require a slope for drainage so water won’t pool on the floor, and 1/4 inch in a foot is typical. But if you do a good tight screed and finish job, 3/16 inch per foot will do.
How do you Slope a concrete slab?
To create the slope of the ramp, build the sides of the form with pieces of plywood cut at an angle along the top. The key to shaping the concrete into a slope is to use a stiff mixture; if the concrete is too wet, it will slump down to the bottom of the ramp, seeking its own level.
How do you make a sloping concrete slab?
- #1. Level Your Pouring Surface. Prepare the ground before pouring concrete in to it. …
- #2. Space Your Forms Evenly. Make sure that your pour is of uniform width when your form has been installed and ensure distance between side boards is uniform. …
- #3. Order Concrete. …
- #4. Pour concrete. …
- #5. Finish Your Concrete.
Should you put plastic under concrete?
If the ground is dry, plastic prevents water from being sucked out of the concrete while curing. You can always wet the ground prior to laying the concrete for a similar effect.
Is gravel needed under concrete?
Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.
Do you need footings for a garage slab?
All 3 types of slabs will need a footer and a slab of at least 4″ thick. The footers depth needs to be the depth of the frost line or as per local code, but no less than 12″ deep.
What kind of stone goes under concrete?
Do you need rebar for 4 inch slab?
No, depending on your proposed loads. But a 4″ thick slab really shouldn’t have rebar in it, too thin. Most thing slabs, like driveways or sidewalks have a wire mesh reinforcement in them not rebar. 6x6x10/10 mesh is typical.