What is the difference between a strip foundation and a trench fill foundation?

What is the difference between a strip foundation and a trench fill foundation?

Trench fill foundations are thinner in size than strip foundations but thicker in concrete. This type of foundation is preferred by self-builders, and so may be a good option if you are planning to build your own property.

How deep are trench fill foundations?

Strip foundations should be 150mm to 500mm thick. Trench fill foundations should be greater than 500mm thick.

What are the advantages of strip foundation?

Strip foundations consist of a continuous strip of concrete formed centrally under loadbearing walls. The continuous strip acts as support for which walls are built and is to a width to spread the load evenly of the building on the ground underneath it, supporting it.

When would you use a trench fill foundation?

Trench fill is often used when soil is loose or in areas with a high water table, although in loose ground it can be difficult to predict the quantity of concrete required, and the quantity can be quite high if trenches meet or cross at right angles.

When should trench fill foundations used?

How thick should a foundation be?

A typical foundation wall minimum thickness of eight inches applies to walls eight feet or less with no more than seven feet of soil pressing against it. Foundation walls taller than eight feet with more than seven feet of soil pressing against it requires a larger foundation wall 10 to 12 inches in width.

What is a stepped foundation?

: a footing in which the desired width is secured by a series of steps in about the proportion of one unit of horizontal dimension to two units of vertical dimension.

What are the benefits of a foundation?

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Why is deep foundation used?

Deep foundations carry building loads to more competent strata that are down too far below the ground level, preventing the surface conditions from affecting their base bearing capacity. They usually go beyond 3 meters below the finished ground surface.

Why do we use deep foundation?

Deep foundations are necessary where the bearing capacity of the surface soils is insufficient to support loads imposed and so they are transferred to deeper layers with higher bearing capacity. They are typically used for large structures, and in situations where soil is not suitable to prevent excessive settlement.

Why do you need a trench fill Foundation?

It can also help to reduce the width of the foundation where below ground brickwork would require a wider footing .

What are the problems with trench fill strips?

Strips excavated through poor ground to reach suitable bearing strata can prove troublesome due to instability of the trench sides, particularly at changes in direction of the strip ( see Fig. 11.1 ). This can be overcome by using suitable trench supports. However, the problem can often be more economically assisted by good design.

Which is easier to fill with concrete or trench blocks?

There is no comparison in my book. Fill with concrete as high as you dare. It is a lot simpler than struggling around in trenches that cave in, a nightmare to work in when wet, then all that back filling etc, etc. As stated, just remember to allow for any drainage installations or ducting/shuttering where necessary.

Do you have to pay a bricklayer to fill a trench?

The benefit of trench fill concrete is that you don’t need to pay a bricklayer to build the footings in the trench. You will need to work out your drainage in advance though.