- Why do they put foam under concrete?
- What are waffle pods made of?
- What is a strip footing?
- How does a waffle pod slab work?
- What are waffle pods used for?
- Should you put plastic under concrete?
- What is the difference between ribbed slab and waffle slab?
- Where is waffle slab used?
- How thick should a concrete slab be?
- How long does a waffle slab take to dry?
- Which slab is better waffle pod slab or raft slab?
- Should you insulate under concrete slab?
- How do you estimate a concrete slab?
- Is it cheaper to build on a slab or piers?
- How much does a waffle pod slab cost?
- Are waffle pod slabs good?
- Can you use spray foam under concrete slab?
- How thick is a waffle slab?
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..
What are waffle pods made of?
Waffle pods are made from lightweight expanded polystyrene (EPS) products. The function of waffle pods is to act as void formers for concrete slabs, onto which concrete is subsequently poured. Once used in construction slabs, waffle pods are fully encased in concrete.
What is a strip footing?
Strip footings, otherwise known as strip foundations, are a shallow foundation type, usually boasting a founding level that is no greater than 3m from the ground surface. As the name suggests, the formation is in a strip of linear structure that ultimately serves to spread the weight across the total area of the soil.
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 are waffle pods used for?
The Waffle Pod Slab System refers to a technologically advanced method of concrete slab construction that involves building ‘on-ground’ instead of ‘in-ground’. This process removes the need for trenching, reduces building costs, and improves construction durability and strength.
Should you put plastic under concrete?
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.
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. … Waffle slabs have a thin topping slab and narrow ribs spanning in both directions between column heads or band beams. The column heads or band beams are the same depth as the ribs.
Where is waffle slab used?
Waffle slab can be used as both ceiling and floor slab. They are used in the areas where less number of columns are provided, i.e. it is basically used in th areas which has huge spans. Waffle slab is not used in typical construction projects.
How thick should a concrete slab be?
4 inchesStandard 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.
How long does a waffle slab take to dry?
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! Once the slab has had enough time to cure, the plumbing and drains will be connected onsite.
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.
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.
How do you estimate a concrete slab?
How to calculate concrete:Determine 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…•
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 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.
Are waffle pod slabs good?
A Place for Waffle Slabs Waffle pods work well on non-reactive sites, slightly reactive clay sites and some moderately reactive clay sites. Waffle slabs are not recommended on highly reactive clay sites (Class H1 and Class H2) because the requirements for good drainage are almost impossible to achieve.
Can you use spray foam under concrete slab?
Insulating under foundation and basement slabs using SPF (spray polyurethane foam) offers certain advantages over the more common method of using rigid foam board. … Two-pound foam. Only closed-cell SPF can be used in a subslab installation; the open-cell foam does not have adequate compressive strength.
How thick is a waffle slab?
Waffle slab design Slab depth is typically 75 mm (3 in) to 130 mm (5 in) thick.