Foundation Contractors are generally
structural engineers, work for or lay foundations using the plans of
A foundation is a structure that transfers loads to the
Foundations are designed to have an adequate load capacity with limited
settlement by a geotechnical engineer, and the foundation itself is
designed structurally by a structural engineer.
The primary design concerns are settlement and bearing capacity. When
considering settlement, total settlement and differential settlement is
normally considered. Differential settlement is when one part of a
foundation settles more than another part. This can cause problems to
the structure the foundation is supporting. It is necessary that a
foundation is not loaded beyond its bearing capacity or the foundation
Other design considerations include scour and frost heave. Scour is when
flowing water removes supporting soil from around a foundation (like a
pier supporting a bridge over a river). Frost heave occurs when water in
the ground freezes to form ice lenses.
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Wanegar Engineering Co.
serving Marin for 18yrs. We provide Drainage, Drilling Retaining
Walls Excavation, Foundations, Underground
Utilities, Sewer &
Septic, Water-proofing Driveway Removal & Replace, Concrete &
Pavers, Water Cisterns ...
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|Bay Concrete Construction Inc
Mill Valley, CA 415 388-7003
Boesel Design & Construction
35 Deer Park Ln, Fairfax, CA 415 456-4605
Brent Harris Engineering
50 La Cuesta Ave, Lagunitas, CA 415 488-1433
David Hoffmire Construction
767 Lincoln Ave, San Rafael, CA 415 454-4440
Dennis Webb Construction
160 Caribe Isle, Novato, CA 415 505-3562
Hughes Structural Inc
San Rafael, CA 415 454-9172
James W Josephs & Co
231 Laurel Ave, San Anselmo, CA 415 454-8499
PAPCO Foundation Contractr
647 Glenwood Ave, Mill Valley, CA 415 389-1888
200 Gary Pl, San Rafael, CA 415 457-5658
Soil Engineering Constr Inc
110 Belvedere St, San Rafael, CA 415 459-5550
Sonoma-Marin Construction Co
275 Water St, Petaluma, CA 707 763-6981
Thomas H Lutge Structural Engr
Greenbrae, CA 415 461-1872
Tim Ford Construction
PO Box 2732, San Rafael, CA 415 454-6163
PO Box 403, Larkspur, CA 415 924-5444
111 Pelican Way, San Rafael, CA 415 453-3732
Changes in soil moisture can cause expansive clay to swell and shrink.
This swelling can vary across the footing due to seasonal changes or
the effects of vegetation removing moisture. The variation in swell
can cause the soil to distort, cracking the structure over it. This
is a particular problem for house footings in semi-arid climates
such as South Australia, Southwestern US, Turkey, Israel, Iran and
South Africa where wet winters are followed by hot dry summers. Raft
slabs with inherent stiffness have been developed in Australia with
capabilities to resist this movement.
When structures are built in areas of permafrost, special
consideration must be given to the thermal effect the structure will
have on the permafrost. Generally, the structure is designed in a
way that tries to prevent the permafrost from melting.
Foundations are generally broken into two categories: shallow
foundations and deep foundations.
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