How to Build Foundation Walls?


A foundation wall provides support for the entire structure you are building. Foundation walls should be planned and constructed carefully as they are probably the most important part of the structure. When foundation walls are not built correctly, cracks might appear, and settling of the structure can also occur. Cracks may occur due to the foundation being ​backfilled before the concrete has achieved the required strength or because the necessary amount of steel was not placed accordingly.

Foundation Wall Design Considerations

Foundation walls shall be designed to withstand erosion, fast-moving water, and other factors affecting those types of wall. The first two reasons restrict or limit the use of foundation walls in coastal areas. Main elements that should be considered when building foundation walls include:

  • Embedment
  • Height
  • Materials
  • Bracing or lateral support
  • Flood openings
  • Grade Elevation

A foundation wall should be built in such a way that the top of the footing shall be no higher than the depth of erosion and scour. If you cannot achieve this, you must consider using a pile foundation that can be installed at higher depths. A poorly embedded wall will lead a building to slide along the ground surface. Foundation walls will typically require lateral support from the floor system and diaphragm, and connections to the top of the walls must be detailed properly.

Foundation walls should be constructed high enough, so the bottom of the floor is above the design flood elevation. It is recommended to have at least 8 inches above the DFE at all points. When you are building a masonry or concrete foundation wall, it shall have a minimum thickness of 6 inches. For larger foundation wall depths, the minimum thickness must be the greater of 6 inches or 1.5 times the length of the footing projection from the foundation wall.

Foundation walls can be built from almost any material, but concrete, masonry, and wood are predominant. If the build is using wood, you will need to be sure that it has been treated or certified for marine. Make sure even cuts and holes should be field-treated. Masonry foundation walls should be fully grouted and reinforced. Concrete foundation walls must be reinforced, and the concrete mix must be a high-strength, low water-to-cement ratio.

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