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Strip foundations

A strip foundation is any foundation that is made by pouring a continuous, uninterrupted slab of concrete. These foundations are generally U-shaped and can be used for many different structures like garages, porches, walkways, or even complete buildings. There are several types of strip foundations that you can use depending on your specific needs; here we will discuss deep strip, shallow (or standard) strip, floating (dependent) and cantilever strip foundations.

Why is it called “strip foundation”?

The name “strip foundation” could be in reference to the shape of the foundation, but it is more likely related to how much of the soil is removed when installing these foundations. A strip footing displaces much less than an area footing which means that there is less disruption in the natural occurring layering in soils. Much thinner soil layers can also be found between these two types of foundations so not as much material has to be dug out when pouring a strip foundation.

When would you use a strip footing?

A deep (or full) strip foundation should only be used for buildings where you plan on having one or more extra floors added later. These are also great foundations for driveways and garages because they require very little maintenance like road base. Strip foundations are good for building on difficult terrain because they can be formed to suit specific layering of soils.

What are the different types of strip foundations?

There are several types of strip footings which you can use based on your needs. This includes deep, shallow, and full-strip foundation types. A full strip footing is recommended if you plan on adding floors later while a shallow or half strip footing should only be used when there is an extra thick layer of soft soils right under it. Deep strip foundations can also have their depth adjusted based on what soil condition the site has without requiring too much effort after pouring the initial footing base.

What are the different types of strip foundations?

Deep strip foundations are used for wide piers or abutments with long hangers where there are no obstructions underneath. Strip footings can be deep or shallow depending on soil type and load requirements. The footing should be at least 1-foot thick for adequate strength. If you select a shallower footing depth, consider specifying inclined reinforcers within the footing to compensate for reduced capacity in all directions of bending moment. It is also possible to use joint reinforcement instead of inclined reinforcers although joint reinforcement may not offer any advantage over unreinforced strip footings in most cases.

In the construction industry, a strip foundation is a type of shallow foundation that can be either monolithic or multiple sections.

In addition to their name, strip foundations are sometimes referred to as ‘strip footings’. The term ‘deep strip footing’ is also used where there are larger depth requirements than usual.

A deep strip footing is usually 100mm thick, but can vary depending on site specific conditions and building design requirements. They may comprise either one or several concrete elements designed to act independently or in conjunction with each other for increased load-bearing capacity or improved soil/ sub-soil characteristics.

Strip foundations are typically designed by specialist engineers according to standard EN 1065-3 , updated June 2014.

When would you use a strip footing?

Deep strip foundations are used for wide piers or abutments with long hangers where there are no obstructions underneath. Strip footings can be deep or shallow depending on soil type and load requirements. The footing should be at least 1-foot thick for adequate strength. If you select a shallower footing depth, consider specifying inclined reinforcers within the footing to compensate for reduced capacity in all directions of bending moment. It is also possible to use joint reinforcement instead of inclined reinforcers although joint reinforcement may not offer any advantage over unreinforced strip footings in most cases.

In the construction industry, a strip foundation is a type of shallow foundation that can be either monolithic or multiple sections.

In addition to their name, strip foundations are sometimes referred to as ‘strip footings’. The term ‘deep strip footing’ is also used where there are larger depth requirements than usual.

A deep strip footing is usually 100mm thick, but can vary depending on site specific conditions and building design requirements. They may comprise either one or several concrete elements designed to act independently or in conjunction with each other for increased load-bearing capacity or improved soil/ sub-soil characteristics.

Strip foundations are typically designed by specialist engineers according to standard EN 1065-3 , updated June 2014.

When would you use a strip footing?

There are two main types of strip foundation design: ‘end-bearing’, where the strip foundation bears directly on the undisturbed ground at each end, and ‘external type’, which allows the soil to move freely underneath it. End-bearing designs require more corrective measures if there are any changes in soil characteristics over time whereas external type designs do not need substantial correction work.

How do you design a strip foundation?

The depth and width of a strip foundation typically increase in direct proportion to the span. Longer spans require wider foundations, while greater depth is required when the soil is inadequately compacted. Typically. depth and width can be found using the following equations:
Where L= length of footing in metres; D=depth of footing in metres; B =width of footing in metres; C=(3L-1.5B)/2L.

How do you design a strip foundation?

Deep strip foundations are used where loads must be supported at great depths or over large areas, such as flat roofs or parking structures that have unusually long clear spans without support from nearby walls or columns. Individual blocks of concrete cannot reach these distances, but the strip footing can support the load over its entire length.

How do you design a strip foundation?

The minimum depth required for a strip foundation is determined by the size and spacing of steel reinforcing bars (rebar) used, as well as by how much soil deformation will be allowed. Typically, smaller footings use #4 bars spaced every 20 inches (51 cm), while larger footings might use #5 bars spaced at 32 inches (81 cm).

Strip foundations can come in both concrete and steel forms.

Strip footing often refers to a strip foundation whose primary function is to transfer loads from a structure into the ground. The term “strip footing” sometimes also implies that it transfers these loads through the soil using a single direction of force, either down or up depending on the orientation of the structure in which they are used. In practice, heavier structures such as skyscrapers will usually require both downward and upward strip footings in order to spread their load into surrounding soils sufficiently.
Strip foundations are not to be confused with pad foundations, which are often used in places where strip foundations would be appropriate, but the soil characteristics are too variable to know for sure where they could be placed. As a result of the variability in soil conditions, it’s typically possible that within a relatively small area, or proximity, there will be enough variation between local soils that several different shallow foundation types will have to work well. Although this means more initial construction cost for test borings and variations in footing thicknesses, it also means less concrete is used overall because each stretch can use footings appropriate to its own characteristics without having to make any compositional changes except at the very extremes.