What is a concrete strip foundation?

What is a concrete 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.

What is the minimum thickness of concrete for a strip foundation?

The minimum depth of the strip foundation trench must be at least 400mm below the original ground level. The average minimum thickness of the foundation must be at least 200mm. The strength of the concrete used for unreinforced strip footing must be at least 15MPa or better.

What materials are used in strip foundations?

Dry, compact gravel or gravel and sand subsoils are usually adequate for strip foundations. Generally a depth of 700mm is acceptable, as long as the ground has adequate bearing capacity.

What is traditional strip foundation?

Strip foundations (or strip footings) are a type of shallow foundation that are used to provide a continuous, level (or sometimes stepped) strip of support to a linear structure such as a wall or closely-spaced rows of columns built centrally above them. …

What are the different types of strip foundations?

There are three foundation types that you’ve probably already heard of, a traditional strip foundation, a raft foundation and a pile foundation. Let’s start by exploring strip foundations.

What is the minimum depth of a strip foundation?

Deep Strip Foundations A concrete strip, sometimes reinforced with steel mesh, supports the walls. The trench depth is variable but in most cases should be at least 1m with a width of 600mm. The concrete should have a minimum depth of 225mm.

How thick should a strip foundation be?

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

How wide should a strip foundation be?

Deep Strip foundations are the least expensive and are used when ground conditions are good. A concrete strip, sometimes reinforced with steel mesh, supports the walls. The trench depth is variable but in most cases should be at least 1m with a width of 600mm. The concrete should have a minimum depth of 225mm.

How deep should a concrete strip foundation be?

What kind of soil do you need for concrete slab?

There are three basic types of soil and here’s what you should know about each: Organic soils, what you might call top soils, are great in your garden, but awful beneath a slab. Organic soils can’t be compacted and must be removed and replaced with a compressible fill. Granular soils are sand or gravel.

Why is it economical to reduce grade of concrete for foundations?

Why? Foundations and columns are compression members whereas beams and slabs are tensile members. The load shall be transferred from slabs to beams, beams to columns, and columns to foundations. It is economical to reduce the grade of concrete for slabs and beams.

What kind of concrete should I use for a foundation?

FND2 concrete is a sulphate resistant mix, which is crucial when you’re laying concrete on sulphate soils or clay. The minimum cement content of the mix is 330kg per cubic metre. This type of concrete is often used for foundations of buildings, where it is likely that soil will be present, which could contain sulphate.

What is the minimum thickness of a strip foundation?

This project will deal only with the strip foundation, the most common and widely used. Indication will be given here where strip foundations may not be suitable. A strip foundation is quite simply a strip of concrete placed in a trench. The absolute minimum thickness of this strip is 150mm.