Multiflex logo

Location

69 Paul Drive
San Rafael CA 94903

Office hours

Mon – Sat 8:00 AM – 6:00 PM
Sun – Closed

Call us Today

415-785-7522

Multiflex logo

Call us Today

415-785-7522

Foundation Underpinning

Foundation underpinning is the method of reinforcing the foundation of a building by deepening the foundation so that it can rest on a more supportive soil stratum.

Underpinning can be used both for renovation and construction, and it may become necessary for different reasons.

In order to make the right decision, it is first necessary to assess the foundation structure, the type of supports used and the exact cause of the foundation damage. Here is a summary of the most common scenarios when underpinning is necessary:

• When the original foundation is not as strong or stable as it should, often because the properties of the soil on which the foundation lays have changed.
• When adding an extra story to the building which requires an increase of the depth or load capacity of the existing foundations to support the additional weight.
• When repairing the existing foundation is more economical than building a new one.
• When stabilizing the foundation soils and/or its footings is needed due to earthquake, flood, drought or other natural causes which may have caused the structure to move or settle.
• Underpinning can be used both for construction and renovation
In order to make the right decision, it is first necessary to assess the foundation structure, the type of supports used and the exact cause of the foundation damage. Underpinning can be used both for renovation and construction.

Underpinning Methods

There are different methods and techniques that can be employed, depending on the type of soil, on its conditions, on the location and on the general state of the home or structure.

One of these methods involves the use of Helical piles or piers, steel piles with one or more helical formed plates. The piles are screwed deep into the soil and secured into more stable load-bearing ground. The tops of the piles are then connected to the foundation of the structure. The use of helical piers or piles requires minimal soil disturbance and movement and are preferred in projects that need to be carried out under such conditions.

Another method involves Caissons, sometimes also called piers, and they are used when the soil under the structure is very unstable or in swampy areas. These are usually hollow boxes or cylindrical steel reinforced forms, which are placed deep into more stable ground or bed-rock, and then filled with concrete. The use of caissons requires considerable excavation work and soil movement.

Grade beams are also used in foundation underpinning. They consist of reinforced concrete beams that transfer the load from bearing walls into spaced foundations such as pile caps or caissons.

Underpinning pads are often chosen for foundation leveling, rather than replacing the entire foundation. They are pads made of concrete and used to support sections of weak or damaged foundation footing.

Whatever the issue with your foundation, we will assess it carefully and will offer you the best solution to preserve the value of your property.

Call us today at 415-785-7522 to get a personalized FREE ESTIMATE for your project!

Get a free Quote

Find out what your project will cost at no charge to you.
Free Quote

Get in touch

Z

Free Consultation

Our Free, no pressure, consultation allows you to find out for yourself and decide based on knowledge.

Z

Friendly Crew

We know we are working for you and do our best to make sure you are 100% satisfied with our work.

Z

Safety First

With over two decades of experience we place your safety above all else. All plan and projects take this as first priority.

About us

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of contracting services customizable to each individual project.

Contact us

I Construction & Structural Inc
69 Paul Drive
San Rafael CA 94903

Office: 415-785-7522
Service: 415-424-5969

Fax: 415-785-7137