Quick Answer: Is Waffle Slab Good?

Is it cheaper to build on a slab or piers?

While a pier and beam foundation will rest on the stone located deep below your home, a concrete slab will rest directly on the ground.

For that reason, concrete slabs are ideal for homes that are being built on flat lots.

Concrete slabs can be constructed very easily and are cheaper than pier and beam foundations..

How long should a slab cure?

approximately 7 daysDuring the slab construction process, the slab will take approximately 7 days to cure, so be patient – you are literally watching concrete dry during this week!

How does a waffle pod slab work?

The construction process involves a building system of concrete slabs that are shored up by columns. The monolithic poured concrete will form a flat top surface while the rectangular grids form deep concrete beams on the underside, with the beams resembling waffle pockets spread out at right angles.

What is a h2 slab?

It comes down to this: a class H2 soil is a highly reactive clayey soil that between wettish and dryish soil moisture conditions can produce very high ground movement. In numbers: 60mm to 75mm of vertical movement.

What is a waffle pod concrete slab?

SLABS. WHAT ARE WAFFLE PODS? This is where the concrete is sitting on (and around) a series of boxes (or Pods) set out in a grid pattern. Think of a waffle pod as a raft lying flat above your soil.

How much does a waffle pod slab cost?

On average, concrete slabs can cost anywhere from $75 to $110 per square metre. That’s still quite a spread, but it gives you a starting point for comparing quotes.

How far can a waffle slab span?

Waffle slabs are preferred for spans greater than 40 feet (12 m), as they are much stronger than flat slabs, flat slabs with drop panels, two-way slabs, one-way slabs, and one-way joist slabs.

Should I put plastic under concrete slab?

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.

Why have a waffle slab?

Built ‘on-ground’ rather than ‘in-ground’, the Waffle Pod Slab eliminates the need for labour intensive trenching – which is required in conventional concrete slab construction methods. Construction takes place on cleared level surfaces, allowing work to continue uninterrupted in wet weather.

Which slab is better waffle pod slab or raft slab?

Slab Heave – Waffle Slab vs Raft Slab Why? Waffle slabs are built on top of the ground and need great drainage and really hard ground for the life of the building. Raft slab footings are dug into the ground, have more perimeter stiffness and more tolerance to poor ground conditions than waffle slabs.

What is a conventional slab?

Conventional slab This type of slab is supported with beams and columns, with the load transferred to those elements. A conventional slab is classified as either: One-way: Supported by beams on two opposite sides, carrying the load along one direction.

Why do they put foam under concrete?

Concrete contractors learned that a layer of poly helps to keep a slab dry, because it stops upward vapor diffusion from the soil. … The foam layer isolates the room-temperature slab from the cold soil under the slab.

How long does a concrete slab last?

Early 20th-century engineers thought reinforced concrete structures would last a very long time – perhaps 1,000 years. In reality, their life span is more like 50-100 years, and sometimes less.

What kind of foam goes under slab?

expanded polystyreneTwo of the rigid foam insulations most commonly used below grade and under slabs are expanded polystyrene (EPS) and extruded polystyrene (XPS). Although both are closed cell insulations, they perform very differently over the long term.

What is the difference between ribbed slab and waffle slab?

Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. Normally the ribs and the beams are the same depth. … Waffle slabs have a thin topping slab and narrow ribs spanning in both directions between column heads or band beams.

Is it normal for a house slab to crack?

A crack in a slab of 1/8 inch or less is typically a normal shrinkage crack and not a cause for concern. If the crack is larger or growing larger (an “active” crack), or one side of the crack is higher than the other, then you may need to have the work reviewed by a structural engineer.

How long does a waffle slab take to dry?

about seven daysA: On average, it takes about seven days for a waffle pod slab to thoroughly dry. While it does take some patience, the wait will be well worth it.

Should you insulate under concrete slab?

Heat is also lost through the basement 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.