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The concrete should have a minimum depth of 225mm. The footing is the portion of the foundation which ultimately delivers the load to the soil, and is thus in contact with it. Today, for foundations developers mainly use concrete as it is easy to place, spread and level in the foundation trench. This type of footing is commonly used as foundations of load-bearing walls where the soil is of good bearing capacity.. 2. Due to its ability to harden concrete creates a basis for walls and develops proper compressive strength to support the foundations’ load. Strip foundations. The exact thickness will be determined by the soil conditions, design of the building and the number of masonry courses in the walls up to damp-proof course. Trench-fill is used because it is cheaper and quicker. 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. The soil must be of good capacity and linear walls are built along the strip. A concrete strip, sometimes reinforced with steel mesh, supports the walls. A - The concrete slab applies to both methods of construction and should cost about £3,500. Q - What is the difference in costs between strip foundations with a concrete slab and concrete filled trenches and a slab for a house size 170 square metres? Nowadays, these types of foundations are increasingly being used where a light eco-structure is to be built, such as rammed earth walls or strawbale and timber walls. Usually wider, strip foundations use less concrete than trench fill because the base layer of concrete is thinner. The purpose of providing a foundation to a structure is to distribute the load to the soil in such a way that the maximum pressure on the soil does not exceed its permissible bearing value and at the same time settlement is within the permissible limit.. What is Footing? A foundation must bear the structural loads imposed upon it and allow proper drainage of ground water to prevent expansion or weakening of soils and frost heaving. Trenches are dug at least 150mm deep and are filled with concrete, creating a strip of concrete around the area of the property. ... Trench Fill Foundation. Strip foundations are typically 300mm thick. More sophisticated foundations would use a rubble fill between built stone facings, similar to a dry-stone wall, but in a trench. Both foundations will go to the same depth, but a strip foundation will normally be about 225mm thick, whereas a 'trench-fill foundation' [what you refer to as deep strip] will be filled with concrete - up to 150mm below outside finished ground level. Strip Foundation. Types of foundation Shallow foundations. Deep Strip Foundations Deep Strip foundations are the least expensive and are used when ground conditions are good. A shallow foundation, such as the strip foundation, needs durable and stable soil to support it. Spread Footing: As the name suggests, a spread is given under the base of the foundation so that the load of the structure is distributed on wide area of the soil in such a way that the safe bearing capacity of the soil is not exceeded. While the far more common concrete foundation requires separate measures to ensure good soil drainage, the rubble trench foundation serves both foundation functions at once. 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. In a normal state, the soil stress on a strip foundation is distributed symmetrically and is greater near the load-bearing columns. This type of foundation is the most common and is used to build the majority of properties within the UK. A strip foundation is very similar to a trench fill foundation except there is a wide-based concrete or block strip in the trench instead of solid concrete. Pad foundations; Strip foundations; Raft foundations. The trench depth is variable but in most cases should be at least 1m with a width of 600mm. During an earthquake, the majority of stress shifts to one edge of a strip foundation, while the other edge loses stress. Previously, strip foundations were made of brick.

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