How thick should a waffle slab be?
Waffle slab design
Slab depth is typically 75 mm (3 in) to 130 mm (5 in) thick. As a rule of thumb, the depth should be 1⁄24 of the span. The width of the ribs is typically 130 mm (5 in) to 150 mm (6 in), and ribs usually have steel rod reinforcements. The distance between ribs is typically 915 mm (3 ft).
What is the minimum slab thickness?
The minimum thickness of the slab shall be 125 mm.
What is the minimum thickness of slab without drop panels?
125 mm
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.
What is the maximum span for waffle slab?
The width of beams or ribs provided in waffle slab are generally 110 to 200 mm. Spacing of ribs recommended is 600 to 1500 mm. Reinforced waffle slabs can be constructed for the span up to 16 meters while beyond that length prefabricated waffle slab is preferable.
How thick is the concrete on a waffle pod slab?
They come in three thicknesses for use on different sites: 165mm – Suitable for “A” Soil Classification sites and special purposes* 225mm – Suitable for “S” and “M” Soil Classification sites* 300mm – Suitable for “M” and low “H” Soil Classification sites*
Do waffle slabs crack?
Waffle slab construction gets a lot of flak within the industry as they have been linked with severe cracking in houses in recent years. However, just like any tool, there are certain circumstances in which they are the better option.
What is the thinnest concrete slab?
Be sure you never make your slab thinner than four inches for any application. Six inches is the minimum thickness for a concrete slab that may see any kind of heavy vehicle traffic.
Is 5 inch slab enough?
Slab thickness in inches:- General, 4″ to 6″ slab thickness is considered for residential and commercial building with reinforcement detail as per design. We recommended to use thickness of slab is 5″ used for 1, 2 and 3 storey building.
What is the normal slab thickness?
In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. Methods used for finding slab thickness varies for different types of slabs.
Is a 5 inch slab good?
According to Indian standard rcc concrete roof slab thickness in residential building construction is 4 inches (100mm). Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads.
What are the disadvantages of waffle slab?
The disadvantages of waffle slab are as follows:
- Require greater floor-to-floor height.
- Requires special or proprietary formwork which is costly.
- requires strict supervision and skilled labor.
- Difficulty in maintenance.
- Not suitable in highly windy area.
Is code for waffle slab?
Method as proposed in IS code
IS 456:2000 – “Plain and Reinforced concrete code of practice”, recommends designing ribbed slabs as an equivalent solid slabs where moments in the slab may be obtained from coefficients given in Table 26 of the code.
How thick is a waffle pod?
Are waffle slabs cheaper?
The main benefit of using waffle pod slabs is that they are drastically cheaper than traditional raft slabs. Waffle pod slabs use foam void formers to create the volume required for the ground slab.
Is 2 inches thick enough for concrete?
What is the minimum thickness for concrete? A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. Four inches is most common for a slab. The thinner applications would include drives, walkways, slabs and footers, just to name a few.
Can you pour concrete 1 inch thick?
There aren’t many reasons to have only a 1-inch thick concrete surface. It is too thin to use as a flooring just by itself; however if you need to resurface damaged concrete, a 1-inch layer is a good amount. The old surface is prepared so that the new concrete will adhere, then the new cement is added.
How much weight can a 4-inch slab hold?
A 4-inch thick concrete can support upto 40 pounds of weight. Weight should not exceed 40 lbs/sq ft on an undetermined 4-inch slab. 80 lb/sq ft in isolated areas is fine, but unless you know what the soil bearing and reinforcing is for that slab, you might be looking at cracking.
How strong is a 2 inch concrete slab?
A 2-inch concrete slab can hold 750 psi of weight. The stronger the slab will be, the more concrete is normally put at a thickness of 2 inches or more. A slab’s thickness is most commonly four inches. The stronger the slab will be, the more concrete is normally put at a thickness of 2 inches or more.
Is 3 inch concrete slab enough?
A concrete patio slab should be at least 4 inches thick and have a compressive strength of 3,000 PSI. You’re free to make it thicker or stronger, but unless specifically required for your patio build, it’s likely overkill to surpass 4 inches in thickness.
Is waffle slab cheaper?
Waffle pod slabs are also very lightweight and much easier install than traditional slabs, reducing the overall amount of labour involved. These factors generally result in a waffle pod slab being significantly cheaper than a traditional concrete raft slab.
Does waffle slab have beam?
What is a Waffle Slab? Waffle slabs are a reinforced concrete footing and slab systems constructed on the ground. They consist of a perimeter footing (edge beam) and a series of narrow internal beams (strip footings) at 1.2 metre nominal centres running each way through the slab.
How do you calculate waffle slab?
Calculations for a Waffle Pod Slab
- To commence, divide the total area m^2 by 1.51 to get the number of Waffle Pods required for the concrete slab.
- Multiply the number of waffle pods by 1.40 to calculate the number of 4 way spacers.
- Next, divide the total number of 4 way spacers by 3 to calculate number of 2 way spacers.
What is the thinnest you can pour concrete?
Pouring Too Thin
Be sure you never make your slab thinner than four inches for any application. Six inches is the minimum thickness for a concrete slab that may see any kind of heavy vehicle traffic.
Can I pour a 3 inch concrete slab?
What is the thinnest I can pour concrete?
This is the most common application for DIY concrete pouring. Be sure you never make your slab thinner than four inches for any application. Six inches is the minimum thickness for a concrete slab that may see any kind of heavy vehicle traffic.