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Geotechnical Soil Testing
As part of the Certifying Authority's (NHBC of others) requirements, it is now becoming mandatory to establish the sub-soil characteristics of a development site in relation to their potential to shrink or swell with change in natural water content.
Tests to classify the soils at and below proposed foundation level comprise the determination of the Atterberg Limits (Liquid and Plastic Limits and Plasticity Index) and natural water content. These results are then compared with the NHBC guidelines.
The location of mature trees, especially in close proximity to the footprint of the proposed residence, can also present problems, since these will seasonally affect the water content in the soil. If this is the case a water content/depth profile can be established.
Chemical Tests
The determination of the sulfate (SO4) content and pH value of soil and ground water is also recommended, since this can provide guidance on the type of cement to use in buried foundation concrete.
Site Contamination Assessment
In addition to soil classification, a site contamination assessment may be required by the funding agency (bank)--click on button opposite for more details.
Sampling Services
TSL provide both sampling services and laboratory testing. Testing typically takes between 7 to 10 working days to complete from date of receipt of samples in Bletchley.
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