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How A Raft Slab Works With Different Soil Classes

To grasp the way a raft slab design works with a new building is something you need to take your time with.

Why?

One reason mighty be the foundations of one house is entirely different to another home in a different suburb.

To start with!!! there are so many kinds of soil classification in place around Australia.

As a general rule, building engineers have to survey the area first, then access and determine soil types.

Why?

Because they might have a tendency to shift with a heavy load E.G (house).

Weak soil will place foundations at risk, plus the resilience and safety of the house should the soil shift and
weaken at a time when the building is being assemble on it's foundation.

Every new house needs an appraisal done to substantiate the best type of foundation appropriate for that area.

This is why a raft slab design is propose for areas with weak soil strengths, to stop the likelihood of shifting, plus
this will insure the foundation will remain intact or 'float' just incase the soil shifts.

This method is one of many different ways that can use to build a slab depending on the engineer. But the
builders are the ones that will dig and build the trenches.

This all happens with the buildings foundation according to the house plans. Steel mesh is used with concrete,
which is applied with reinforcements bars that are used to hold it together.

A simple foundation of this kind can be made without reinforcements steel bars, but with dip perimeter ribs.

The thickness of the ribs and slab thickness will be dependent on the soil type, model of the house, climatic
conditions of the area and a few other important factors.

Where there is minimal soil shifting the raft slab design foundation can basically be made with minimum ribs
depth and thickness with little reinforcement.

When the soil is susceptible to movement or shifting, then stronger ribs and steel reinforcement must be used.

Using reinforced ribs is a effective method of achieving a strong concrete slab. This method is cheap, simple,
and fast to construct plus efficient in providing a strong slab foundation.

Here Are A Few More Benefits Of Using A Raft Slab Design.

#1 In cyclonic areas with deep clay soils that are susceptible to shifting.

#2 sloppy grounds where soil structure is bound to move when weight is applied.

#3 It's durable and ensures a house structure will have minimal wall and floor cracks.

#4 Using a raft slab is low maintenance because of the assessment done by the engineer to ensure the correct
kind of slab is in place.

#5 They are easy to build, plus You don't need heavy machinery to move dirt. But Ground preparations is requisite
for a concrete slabs.

#6 A raft slab design can be used on any type of new home.

#7 A raft slab is also used in constructions such as commercial buildings and in light and heavy structures.

#8 Raft slab substratum use ground bearing concrete as part of their construction.

If You Would Like Civplex Structural Engineers Pty Ltd To Design A Raft
Slab For Your New Home We Need The Following Information.

• Your home plans of the building indicating floor span plus construction materials to be used E.G is it brick
walls or timber floors.

• Information on any slab levels with different heights.

• The weight and pitch of the land to conclude the strength of the raft slab recommended.

• The overall class type of the soil, when footings are muse.

• The polystyrene pods offer multiple breadth options to give engineers more options with floor density.

Why?

It allows for stiffness exigency to be adjusted with each new project.

• Another great thing about the polystyrene pods is they have excellent insulation properties.

Lastly with a raft slab some declivitous sites may need to have a geotech report done.

Why?

Due to a few requirements that can not be amalgamate with a ground slab construction Making it impracticable
to build.

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