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Hi: I am building an ICF house with a walkout basement on lot that will require much fill trucked in, so I will only be clearing back the top soil, and then pouring the footings on grade. My test pit report indicate the following;
0 to 30cm (12") Top soil: organic
30 to 61 cm (12" to 24") Subsoil: medium brown, silt and clay
61 to 122 cm. (24" to 50") Light grey brown silt and clay with gravel.
The water table was below on metre (39")
My question is can this type of soil support the type of structure I plan to build, and will the standard 24" x 8" footings be sufficient.
Patrick.
This is really a question for a soils engineer. Organics and clay are not great load bearing soils. The water bearing table presents even more problems, though may not decrease the load bearing of a dense gravel. It would be best to find the depth of shale or other bedrock condition.
There are alternate footing designs including pier and grade beam. I would not be able to decide what is appropriate from here. YOur core boring company should indicate estimated load bearing capacities or have engineers to help.
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| Comment | The response was very honest for identifying that he did not have the knowledge to answer my question, but it has allowed me to look for a soils engineer. Thank you. | ||
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Dan Griffin
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I can answer almost all questions related to the total construction process. My expertise is in commercial construction, though I can field most any residential question. I have hands on experience in concrete, heavy equipment, masonry, all phases of carpentry, interior finishes, and I am fairly strong in mechanical and electrical.
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I have over 20 years experience as a commercial carpenter and commercial construction superintendent. I have another 20 years experience in facility management for a major school district.
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My favorite hobby for he past 12 years has been singing bass in a The OkChorale men's barbershop chorus and the Mature Moments quartet.
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I hold a Bachelor's degree in English and Math. I have completed many continuing education hours in the building trades. I hold a Master Carpenter card from the AGC, Associated General Contractors.
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