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Defects settlement hardcore and subsoil

Beds are usually cast on a layer of hardcore which is used to make up the reduced level excavation and thus raise the level of the concrete bed to a position above ground level. Bearing capacity of subsoil under proposed foundation. Foundation- Basic Sizing Bearing capacities for different types of subsoil may be obtained from tables such as those in BS Code of practice for foundations and BS Structural design of low rise buildings. Also, directly from soil investigation results. If its tensile strength is exceeded cracks will occur resulting in a weak and unsuitable foundation.
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Defects settlement of hardcore and subsoil

A retaining wall that is too slender to withstand the pressures being applied against it will tend to bow or lean outwards. This is a defect that is commonly observed in garden walls that are retaining soil. It is often as a result of too little thought being given to the design implications of any external landscaping. A further cause can be the close proximity of trees. The growth of the root system over a number of years can Page 43 lead to increasing lateral pressure on any adjoining retaining wall. Finally, all retaining walls require the provision of drainage points at frequent intervals in their length and height. Such provision is a common omission and a frequent cause of movement due to the pressure of the groundwater behind the retaining wall.
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Defects settlement of hardcore and subsoil

Often used to ventilate the underside of timber ground floors, fireplaces or a roof space. Often fitted to chimney stacks and tile hanging. Also a section of wall below a window. Although common on doors and jambs of doorways, they are most likely to be found around fireplaces. It usually covers the joints between the frame and the wall finish, thus hiding any shrinkage gaps, which may occur.
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Ian Rock investigates By Ian Rock on Old floors come in many forms — which can mean a variety of problems. While the first floors of period homes generally feature some form of timber joist and board construction, ground floors have traditionally consisted of lime-based ground floor slabs or tiles laid straight onto soil. This age-old method worked by allowing moisture from the ground to evaporate out via joints between the tiles. In Victorian times, suspended timbers tended to be used in most rooms, but rudimentary solid floors were still popular in areas such as kitchens and hallways. However, by the s, solid concrete floors became the norm, right up until the advent of modern beam and block suspended concrete floors in the late s.
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