Foundation Maintenance and Footing Performance

Soil TypesThe types of soils usually present under the topsoil in land zoned forresidential buildings can be split into two approximate groups granular and clay. Quite often, Foundation soil is a mixture of bothtypes. The general problems associated with soils having granularcontent are usually caused by erosion. Clay soils are subject tosaturation and swell/shrink for a given area can generally be obtained byapplication to the local authority, but these are sometimes unreliableand if there is doubt, a geotechnical report should be most buildings suffering movement problems are founded on claysoils, there is an emphasis on classification of soils according to theamount of swell and shrinkage they experience with variations ofwater content.

openings for windows or doors. In the event of construction settlement, cracking will usually remain unchanged after the process of settlement has ceased. With local shear or erosion, cracking will usually continue to develop until the original cause has been remedied, or …

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