Asked by: Riccardo Altnickel
business and finance construction industry

How do you calculate slab thickness?

Last Updated: 17th June, 2020

How to calculate concrete:
  1. Determine how thick you want the concrete.
  2. Measure the length and width that you'd like to cover.
  3. Multiply the length by the width to determine square footage.
  4. Convert the thickness from inches to feet.
  5. Multiply the thickness in feet by the square footage to determine cubic feet.

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Besides, what is the minimum thickness of slab?

UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be 89mm, whereas BCGBC4010A – Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm.

Secondly, how do you measure the depth of a concrete slab? Span divide by the span/effective depth ratio = the effective depth. The overall depth of slab = effective depth + the cover to reinforcement + half the diameter of reinforcing bar.

Herein, how thick should slab on grade be?

An article once reported that the thickness of one specified 6 inch slab varied from 2 ¾ inches to 8 inches, but the “normal” range should have been between 4 ½ inches to 7 ½ inches of thickness with an “average” concrete thickness of 5 ¼ to 5 ½ inches.

What is the minimum depth of two way slab?

Moreover, the minimum thickness of any two way slab without interior beams should not be less than the following: For slabs without drop panel 125 mm. For slabs with drop panel 100 mm.

Related Question Answers

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How many types of slabs are there?

There are four different types of concrete Flat Slabs:-
  • Slab without drop and column without column head(capital).
  • Slab with drop and column without column head.
  • Slab without drop and column with column head.
  • Slab with drop and column with column head.

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What is wall thickness?

In 3D printing, wall thickness refers to the distance between one surface of your model and its opposite sheer surface. Wall thickness is defined as the minimum thickness your model should have at any time.

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What is the standard size of column?

Minimum size of an RCC column should not be less than 9” x 12” (225mm x 300mm) with 4 bars of 12 MM Fe415 Steel. These days the minimum I use in my projects is 9″ x 12″ (225 mm x 300mm) with 6 bars of 12 MM Fe500 steel. You can never go wrong with strong columns.

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What is RCC slab?

RCC slab: reinforced cement concrete slab. It has a combination of steel bars and concrete. Steel bars are placed in concrete with calculated spacing. Cover thickness if concrete is provided around the bars. Bars are tied properly to avoid displacement during pouring of concrete.

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What is the thickness of RCC slab?

Minimum RCC beam size should not be less than 9″x 9″ (225MM X 225MM), with an additional slab thickness of 125 MM. I generally use a minimum of 4 bars, with 2 bars of 12 MM thickness in the bottom of the beam, and 2 bars of 10 MM at the top of the beam.

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What is the thickness of roof slab?

The overall thickness of slab is usually kept 10 cm though the minimum thickness can be 7.5 cm. The minimum area of reinforcement per unit width of a slab shall not be less than 0.15%. of the gross cross sectional area of concrete.

Anatolio Cubillana


What is the meaning of one way slab?

One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. In one way slab, the ratio of longer span (l) to shorter span (b) is equal or greater than 2, i.e Longer span (l)/Shorter span (b) ≥ 2.

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What is a slab on grade?

Slab-on-grade or floating slab foundations are a structural engineering practice whereby the concrete slab that is to serve as the foundation for the structure is formed from a mold set into the ground. The concrete is then placed into the mold, leaving no space between the ground and the structure.

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What does slab on grade mean?

The concrete slab that is directly supported by the grade, meaning the bottom of the structure which is normally earth. If this is the case, then the design of the slab on grade is an engineered structural slab, that will span any settlement that may occur within the sub grade.

Aureli Pelleja


Do I need a footing for a 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. The width of the footer needs to be at least 12″ wide.

Binod Aurrekoetxea


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.

Lizi Augusta


What's the difference between a concrete slab and a 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.

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How big can a concrete slab be without expansion joints?

Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.

Janis Andel


What is a floating slab?

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.

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How much does a slab on grade foundation cost?

Concrete Slab Foundation Cost. Most homeowners spend between $5.40 to $6.40 per square foot for a 4” thick foundation, and $6.40 to $8.20 per square foot for a 6” reinforced slab on grade. A 1,600 square foot reinforced concrete slab foundation costs $11,680 on average.

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How much is concrete per post?

Remember, the depth of the post hole should be one-half of the above-ground post height. (Example: For a 6 feet above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground). The calculator will indicate the number of 50 lb. bags of QUIKRETE® Fast-Setting Concrete you need.

Akaki Zhilis


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

Using a Concrete Calculator
You'll also get the number of 40-pound, 60-pound, or 80-pound bags of concrete are needed for the project. For example, a 10′ x 10′ slab that is 4″ thick will need an estimated 1.23 yards3 or 75 60lb bags of concrete and will cost roughly $140.

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How thick is a commercial concrete slab?

Thickness of a Concrete Slab
Concrete countertops are typically 1 ½ - 2” thick and commercial driveways can be 6 to 8 inches thick.

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How thick is a concrete slab?

Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness.