3 inchesYou will need 3 inches of gravel under a concrete slab that is 4 inches thick. More gravel is better, but 3 inches is the minimum amount of gravel you should have with a 4” slab. Use ¾” washed and screened gravel, then compact it to level.

Answered by: jxh Date created: Jun 25, 2022

## How many bags of cement do I need for a 10x10 slab?

Asked By: John Humphreys - w00te Date created: Jun 24, 2022

For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that's an extra 8 60-pound bags or 6 80-pound bags.

Answered By: boetis Date created: Jun 24, 2022

## How many bags of concrete do I need for a 6x6 slab?

Asked By: sev Date created: Jun 18, 2022

0.667 cu. yds. How many concrete bags would I need for a 6 ft x 6 ft x 6" slab? 29.9 x 80lb Concrete bags.

Answered By: Fredrik Mörk Date created: Jun 19, 2022

## How do I calculate how much concrete I need for a slab?

Asked By: stackdon Date created: Jun 21, 2022

CONCRETE CALCULATOR FORMULADetermine how thick you want the concrete.Measure the length and width that you'd like to cover.Multiply the length by the width to determine square footage.Convert the thickness from inches to feet.Multiply the thickness in feet by the square footage to determine cubic feet.More items...•

Answered By: Wytrzymały Wiktor Date created: Jun 21, 2022

## Do you need stone under a concrete slab?

Asked By: Michael Goldshteyn Date created: Jun 13, 2022

Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab. Adding a layer of crushed stone will add proper drainage, as well as create a barrier between your slab and the ground.

Answered By: blowdart Date created: Jun 13, 2022

## How many bags of concrete do I need for a 4x8 slab?

Asked By: Chris Hayes Date created: Jun 16, 2022

Your project is 32 square feet at a depth of 4”. Here is the quantity that you will need for your slab. Quikrete Concrete Mix: 24- 60lb bags.

Answered By: Richard Matsen Date created: Jun 17, 2022

## How much concrete do I need for a 12x20 slab?

Asked By: Claire Lin Date created: Jun 16, 2022

Concrete Extras With a brief look, a 12x20 area at 6 inches deep, you would need approximately 6.31 tons or 4.44 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas.

Answered By: Marcello de Sales Date created: Jun 18, 2022

## How do you run a pipe under a concrete slab?

Asked By: Henrik Gustafsson Date created: Jun 17, 2022

In six simple steps you can dig under concrete:Attach drill pipe.Connect garden hose.Dig a small ditch.Start your bore.Add more drill pipe (if necessary).Pull piping through.

Answered By: Simon O'Hanlon Date created: Jun 20, 2022

## How many bags of concrete do I need for a 4x4 pad?

Asked By: CyberEternal Date created: Jun 09, 2022

The calculator will indicate the number of 60 or 80 pound bags of QUIKRETE® Concrete Mix you need to build a 4″ or a 6″ slab.

Answered By: Lily Ballard Date created: Jun 09, 2022

## How many bags of concrete do I need for a 10x20 slab?

Asked By: Tagir Valeev Date created: Jun 21, 2022

A 60-pound bag yields . 017 cubic yards, and an 80-pound bag yields . 022 cubic yards. For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags.

Answered By: MrCode Date created: Jun 21, 2022

## How much does it cost to replace a sewer line under a concrete slab?

Asked By: Mayur Gajra Date created: Jun 20, 2022

The cost to replace a sewer line under a slab costs \$3,000 to \$5,000 for smaller jobs and \$15,000 to \$20,000 total for larger jobs.

Trenching under a slab can cost an extra \$150 to \$200 per foot..

Answered By: Georg Fritzsche Date created: Jun 21, 2022

Professor

### How much concrete do I need for a 10x10 slab?

For a 10 x 10 slab, we'd suggest a mix with a capacity of about 4,000 pounds per square inch, or psi. This is basic for residential projects, and it can withstand traffic and support heavy loads.

Professor

### How many bags of concrete do I need for a 8x8 slab?

How many concrete bags would I need for a 8 ft x 8 ft x 6" slab? 54 x 80lb Concrete bags. How much does it cost to pour a 8'x8' x6" slab? Ready-mix costs approx \$277.86.

Professor

### How many yards are in a 30x40 concrete slab?

22.222 cu. yds. How many concrete bags would I need for a 30 ft x 40 ft x 6" slab?

Professor

### What can I use instead of a concrete slab?

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....Gravel.Pavers.Timber sleepers.Asphalt.Resin.Sand.Mulch.

Professor

### What's the difference between concrete slab and cement slab?

The difference between cement and concrete Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of 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.

Professional

### Do I need rebar for small concrete slab?

You do not need rebar for any slab if you make it thick enough and space the joints properly. Rebar in jointed pavement is there to counter the cupping effect of thermal expansion. I always recommend the use of rebar or at least rewire. Any concrete slab can crack.

Professional

### How much cement do I need for a 20x20 slab?

With a brief look, a 20x20 area at 6 inches deep, you would need approximately 10.52 tons or 7.41 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas.

Professional

### How do I find a water leak under a concrete slab?

Signs Of A Leak Under Concrete1). There is water or damp spots on your floor. If hot-water lines are leaking, this may also lead to warm spots on your floor. ... 2). You can hear the sound of rushing water underneath your floor. ... 3). There is a significant increase in your water bill.Jan 10, 2021

Professional

### How do you install moisture barrier under concrete slab?

Most exterior slabs do not need a vapor barrier. ... In general, place the concrete slab directly on top of the vapor barrier, with the subbase below. ... The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed.More items...

Professional

### Do I need cement board for stone veneer?

Natural stone veneer is heavy and should not be installed over drywall; cement backerboard or masonry applications are recommended.

User

### Do I need mesh in my concrete slab?

Concrete is strong in compression, but not under tension. So, if it flexes, like a slab with a vehicle on top of will do, it cracks at the bottom whre the flexing becomes tension. ... Mesh will help mitigate the chances of cracking of the slab due to differential settlement.

User

### How Can concrete be a composite material?

Concrete is regarded as a composite material because it is composed of a number of materials that combine to form this versatile building material. Most concrete is made up of Portland Cement, aggregates (gravel, crushed stones) and sand. Water is added to the mix. The aggregate (crushed stone) is clearly seen.

User

### How much concrete do I need for 2 post lift?

12,000 pound two-post lifts (and higher capacity): Six (6) inches of concrete at 3000 PSI is required.

User

### How much concrete do I need for a 24x24 garage?

Average Cost To Pour Concrete To pour a typical 10x10 concrete slab will cost \$670 to \$930, a 12x12 slab for a patio will cost \$796 to \$1,476, a 20x24 driveway slab runs between \$1,440 and \$3,360, and a 24x24 slab for a garage will cost \$3,058 to \$5,944.

User

### How many tons of crushed concrete do I need?

To figure out the how many tons you will need is not hard to do. You will have to know that the standard weight contractors use for crushed stone is 2700 pounds per cubic yard. Multiply the number of cubic yards by 2700 and divide by 2000. This value is the number of tons that you will need.

Guest

### How much crushed concrete do I need?

Beside above, how much crushed concrete do I need calculator? In the construction world, most materials are measured in cubic yards. Multiply the length (L), in feet, by the width (W), in feet, by the height (H), in feet, and divide by 27. This will tell you how many cubic yards of crushed stone you need.

Guest

### How much concrete should I get around my pool?

Table and chairs for up to eight requires a minimum 12' x 12' concrete slab. Small end tables and chairs do vary on size of the table. For concrete purposes we generally recommend 5' x 5' concrete slab. Tanning lounger/ Chaise loungers need a minimum of 8' of concrete off of the swimming pool.

Guest

### How many bags of concrete do I need for a 5x5 pad?

How many concrete bags would I need for a 5 ft x 5 ft x 6" slab? 20.8 x 80lb Concrete bags.

Guest

### Can concrete be poured over stones?

Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Similarly, if there are roots or plants under your slab, they may rot and cause unevenness. Pouring concrete over crushed stone, however, will eliminate these worries.

Guest

### Can I mix cement with clay?

The soil material in soil-cement can be almost any combination of sand, silt, clay, gravel, or crushed stone.

Guest

### Do you need a concrete slab for a hot tub?

A hot tub requires a stable surface — whether it's a concrete slab, reinforced deck, or firmly compacted soil with crushed gravel.

There's also the option to have the hot tub installed in the ground but that still requires a concrete vault..

Guest

### Do I need insulation under a concrete floor?

Creating an insulation layer and a vapor barrier between the concrete slab and the ground beneath it is the best practice in insulating basement floors.

The insulation barrier will help keep warm air in, and the vapor barrier will keep unwanted moisture out..

Guest

### How much insulation do I need under a concrete floor?

A 50mm thick layer of proprietary floor slab insulation is usually enough to reach and maintain the target U value but this should be checked with an architect first. Insulation sheets should be laid tightly together with the joints staggered to avoid movement.

Guest

### Should I put cement board under tub?

You don't need any cement board under the tub. It is far more important to have a sturdy layer of ply under the tub.

Guest

### How much concrete do I need for an inground pool?

Plan on at least 5 minutes per cubic yard, for unloading time. How much concrete do I need? Order this much concrete, for these standard pool sizes. 12 x 24 – 5 yards, 14 x 28 – 6 yards, 16 x 32 – 7 yards, 18 x 36 – 8 yards and a 20 x 40 – 9 yards.

Guest

### How many yards of concrete do I need for a 10x10 slab?

10 x 10 = 100 square feet. 4 ÷ 12 = .33. 100 x .33 = 33 cubic feet. 33 x .037 = 1.22 cubic yards.

Guest

### How many bags of cement do I need for a 4x4 slab?

Your project is 32 square feet at a depth of 4”. Here is the quantity that you will need for your slab. Quikrete Concrete Mix: 24- 60lb bags.

Guest

### Do I need DPM on concrete floor?

Do I need a DPM under laminate flooring? Simply put yes. In order to prevent damp rising through the concrete floor and causing issues, a DPM should be used under all final floor types including wood flooring, laminate, vinyl and floor tiles.

Guest

### Is crushed concrete good for paver base?

So, crushed concrete is enough good for drainage of a paver base and can be used. Besides, Crushed concrete is cheaper than other crushed stone, but is also just as durable. And because the material can be purposed for such a large variety of projects, nearly everyone can enjoy the advantages of crushed concrete.

Guest

### Do I need concrete reinforcing mesh?

And yes, mesh is important: Concrete is strong in compression, but not under tension. So, if it flexes, like a slab with a vehicle on top of will do, it cracks at the bottom whre the flexing becomes tension. Steel mesh will prevent this to a large degree and hold it all together.

Guest

### Do I need to reinforce my concrete slab?

Concrete is an incredibly resilient material, which is why it's used so much in building and construction work. However, some types of concrete structure require reinforcements, which are often put in place as the mixture sets.

Guest

### How much concrete do I need for 1m3?

Various instructions and regulations therefore also state that you need about 56 packs of dry concrete of 40kg each for 1m³, which results in about 17.86 litres of liquid concrete per pack.

Guest

### How many bags of concrete do I need for a 10x10 slab?

For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that's an extra 8 60-pound bags or 6 80-pound bags.

Guest

### How much concrete do I need for a post hole?

To calculate how much concrete you need, you need to know the post size you are going to use and how many posts you are installing. Your post diameter and height determine how big each hole needs to be. As stated above, fence post holes should be 3 times the diameter of your post and 1⁄3 as deep as your post.

Guest

### How many bags of concrete do I need for a 12x12 slab?

Enter the size of the slab you want to build in square feet. The calculator will indicate the number of 60 or 80 pound bags of QUIKRETE® Concrete Mix you need to build a 4″ or a 6″ slab. (All yields are approximate and do not include allowance for uneven subgrade, waste, etc.)

Guest

### Do I need gravel under my concrete slab?

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..

Guest

### What is the difference between a concrete slab and a cement slab?

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.

Guest

### How much concrete do I need Home Depot?

Each 80-pound bag of QUIKRETE(r) Concrete Mix will yield approximately 0.6 cubic feet of concrete. For a 10' by 10' slab at 4" thick, you will need 33-1/3 cubic feet of concrete, or 56 80-pound bags. Yields are approximate and will vary with waste, uneven subgrade, etc.

Guest

### How many bags of cement do I need for 1 cubic yard?

45 bagsPure cement, sand and crushed rock all have about the same density, so a block of pure cement measuring 1 cubic yard of volume (about 3,600 pounds) will contain 45 bags of cement.

Guest

### How many bags of concrete do I need for a 4x8 pad?

Here is the quantity that you will need for your slab. Quikrete Concrete Mix: 24- 60lb bags.

Guest

### How much concrete do I need for a 20x20 pad?

Concrete Slab Prices By SizeSlab SizeSquare FeetAverage Cost Installed15x15225\$1,38820x20400\$2,46824x24576\$3,55420x30600\$3,7026 more rows

Guest

### How much concrete do I need for a 40x60 slab?

The use determines the thickness. So if you take the surface area and multiply it by the thickness you will get the volume. Ie. 40 feet × 60 feet × 1 foot thick would be 2400 cubic feet of concrete divide by 27 to get cubic yards 2400÷27= 88.889.

Guest

### How much concrete sealer do I need?

Apply the Sealant Depending on how porous your concrete is, a gallon of sealer will cover 250 to 500 square feet.

Guest

### What is the best base for a concrete slab?

Most concrete contractors want a mix of coarse and fine aggregate to create a compactable base that is going to be safe for settlement and drainage. Crusher run (a mix of crushed stone and stone dust) is one of the best base materials for concrete flatwork.

Guest

### Can I pour concrete without rebar?

It's false economy to do concrete without putting in rebar and mesh. Rebar around the perimeter at the least, and mesh over the rest. Pull it up when pouring so it is not resting on the bottom of the slab. You don't need the fancy rebar supports, a stone or broken brick will work just as well.

Guest

### How do I figure out how much concrete I need for a round hole?

They are 4 feet in height and 10 inches in width (diameter), or 4′ x 10″.Choose Round Column (or Round Slab) on the calculator.Enter Height 4 ft (or 48 in)Enter Diameter 10 in.Calculate and the answer is 0.08 cubic yards for one concrete tube.Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes.More items...

Guest

### How much concrete do I need for a 10 sonotube?

For example, a sono tube with a 10" diameter and a 4' depth requires 0.08 cubic yards of concrete.

Guest

### What's the difference between a concrete slab and a cement slab?

Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement.

Guest

### Do I need gravel under concrete slab?

You do need gravel under a concrete slab, footing, or patio. Gravel provides a solid foundation for your concrete as it can be compacted. It also improves drainage, preventing water from pooling beneath the concrete.

Guest

### Why do you put plastic under a concrete slab?

In fact, most professional shed slab builders will install a polyethylene membrane under a shed concrete slab even if it is not specified. The reason is that the vapour barrier stops moisture from the wet concrete escaping into the ground under the concrete.