However it should always be below the seasonal frost line and that often is much deeper in northern climates.
How to build a concrete retaining wall footing.
If you are new to this type of project here are a few tools and materials that you may need as well as some steps to help guide you through the process.
The interlocking retaining wall block can be used to build walls up to 24 to 36 inches high depending on the size of the block.
Thoroughly planned and ably performed wall construction will help to ensure the retaining wall s stability.
Concrete blocks are a common building material for a variety of outdoor projects such as retaining walls and out buildings like garages and tool sheds.
Concrete retaining wall footing size the depth to the bottom of the base slab should be kept at a minimum of two feet.
Of compacted base 1 in.
Because of this the footings will need to be built to create a sturdy base.
One key aspect of retaining wall construction is preparing a solid footing or foundation.
A retaining wall is used to stop soil or dirt in one area typically elevated from moving down to a lower area.
However for even the most modest block structure to have enough rigidity to bear pressure and weight it needs proper footing.
Follow the block manufacturer s instructions for wall height limits.
Cross section of a retaining wall a cinder block retaining wall is only as straight and solid as the base it s built on.
Of leveling sand and half the height of the first course of blocks.
How to build a concrete wall figure a.
This should be done at every three blocks or at intervals specified by your local codes.
The footing is usually made of poured concrete but in some situations homeowners may instead opt to simply use tamped earth or a gravel base.
Avoid having downspouts pointed at the retaining wall and if it s against the house keep soil and mulch well below the siding.
Expect to spend 20 36 hours building a 3x10 foot concrete block.
Retaining walls must be stronger than freestanding walls.