Laying a concrete garage floor involves digging out any soil, compacting 150mm hardcore, a 50mm layer of sand, a damp proof membrane and a final concrete slab. Adding a reinforcement mesh will add strength. To get it completely level I used timber guide battens and tampered the concrete using a timber straight edge.

Also question is, can I build a garage on a concrete slab?

For a garage WITHOUT a floor – BUILT ON SITE: Prepare a level concrete slab at least 4” thick and to the exact, outside, dimensions of your garage. You may want to consider a 6″ thick slab for larger vehicles such as trucks or RVs.

Also Know, what kind of concrete do you use for a garage floor? To make your concrete mix, get some cement, sand, gravel, and water. The best combination would be 1 part cement, 2 parts sand (small aggregates), 3 parts gravel (large aggregate) and 1 part water. Mix all the dry materials first, and slowly add water as you go along.

Moreover, how thick should a garage concrete floor be?

Standard Thickness 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 new concrete over old concrete?

If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. Proper prep work is key to success when layering new concrete over old. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up.

Related Question Answers

Do you need rebar for 4 inch slab?

If you don't put rebars in a 4inch [10 CM] slab, then it won't be reinforced concrete – and won't perform. As a general rule, any section of concrete must have at least 0.25% of its area in rebars to be considered reinforced concrete and do the intended job.

Should I put plastic under concrete?

Vapor retarders have been used since the 1950s. Recently, though, research has shown that the old traditional layer of 6-mil Visqueen (polyethylene plastic) under the slab is seldom effective for two main reasons: Although it may seem water-tight, this grade of material allows a lot of water vapor to pass through.

Do you need rebar in a garage floor?

No, rebar is not required. Garage floors are poured last. Generally the thickness is usually about 4″ minimum plus. Many builders will not use rebar, nor do many provide control cuts.

What can I use instead of concrete?

Gravel is one of the more common alternatives to concrete. There are a few different types you can find in the home improvement store that can replace concrete cement used for driveways and walkways. These include pea gravel, crushed stone, and quarry process.

How thick should concrete be for 2 post lift?

What are the concrete floor requirements of my lift? 12,000 pound twopost lifts (and higher capacity): Six (6) inches of concrete at 3000 PSI is required.

How do I raise my garage floor?

How to Raise a Garage Floor for Living Space
  1. Measure the distance from the garage ceiling to desired final floor level at each corner of the garage and make a pencil mark on the wall.
  2. Cut pieces of 1½-inch-by-3½-inch pressure-treated wood to the full inside dimension of the garage parallel to the garage door wall.

Can I pour my own concrete slab?

So how much does it cost to pour a concrete slab? In our area, hiring a concrete contractor to pour a 16 x 20-ft. slab like this one would cost $3,000 to $4,000. The amount of money you'll save on a concrete slab cost by doing the work yourself depends mostly on whether you have to hire an excavator.

Can you build a garage on a floating slab?

A floating slab does not have frost protected footing and is designed to “float” with the ground during the winter months. Floating slabs are most commonly used when building a detached garage or shed. A floating slab cannot be used if the structure that is built upon it is attached to your house.

Is rebar needed in concrete slab?

Not all surfaces need concrete rebar reinforcement, but adding it makes concrete stronger and more resistant to large cracks. Without rebar reinforcement, concrete is highly prone to cracks due to tension forces. Rebar helps prevent cracks from growing wider largely by preventing cracked slabs from moving apart.

Do you need a foundation for a garage?

That's one of the most common questions from homeowners interested in building a new storage space. While for sheds, a concrete foundation is optional most of the time, a garage foundation is essential. It's best to plan for pouring a concrete garage foundation before you begin building.

How deep should a garage foundation be?

Dig trenches for your footings around the perimeter of your garage. Local building codes will specify the minimum depth and width of your trenches, but in general, the trenches should be at least 12” – 18” wide and minimum18” deep.

How much does a 24×24 concrete slab cost?

Concrete Slab For Garage Cost

A typical 24×24 garage slab costs between $3,057 and $5,944 with prices ranging from $5.31 to $8.31 per square foot for a 4” reinforced slab of concrete, and $6.83 to $10.32 per square foot for a 6” slab of reinforced concrete.

How do you build a garage foundation?

How to Build a Garage Foundation
  1. Lay out where you will build your garage foundation.
  2. Dig your footings.
  3. Put your 2-by-10 form boards in place for pouring concrete.
  4. Take another form board, 2-by-6, and place that form 6 inches from the inside of the outside form board.

What is a floating garage floor?

Floating slabs are concrete slabs that are laying over the ground, without any kind of anchoring, as if it simply sits on it and floats. The main application of floating slabs is to use as a base foundation for sheds, manufacturing workshops, home additional room, or garages.

How long does 4 inches of concrete take to cure?

28 days

How many inches of gravel do you need for a concrete slab?

Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete.

What is stronger cement or concrete?

The difference between cement and concrete

Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Concrete gets stronger as it gets older. Cement comprises from 10 to 15 percent of the concrete mix, by volume.

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 allows water to drain into the ground below. When packed tightly, however, the gravel doesn't shift beneath the concrete.

How do you fix a pitted concrete garage floor?

Saturate the concrete with water and then use a broom to push out any puddles from the pitted areas or low spots. The concrete should be damp when you apply the resurfacer, but not wet to the touch. Pour the mix into a puddle on the slab and immediately spread it (Photo 7).