In this case the top of the excavation is sometimes.
How to build hollow concrete block retaining wall.
Flexural stress comes from the pressure of the load the walls bear from the upper floors or roof of a house or from storms or seismic activity.
Stack the second course of blocks on top of the first course making sure they remain level.
Backfill with gravel behind the wall to cover the drainage pipe.
How to build a concrete wall figure a.
Tall wall excavate a trench deep enough to accommodate 4 to 6 in.
The height of the wall and soil type determine the footing size and steel reinforcement requirements so check with a building authority for regulations and engineering specifications and for any required.
Of compacted base 1 in.
The concrete foundation needed to support a cement block wall is usually created by pouring concrete into a hollow form lining the sides of the excavation trench but the concrete can also simply be poured into the trench a common scenario for construction of a freestanding landscape wall.
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.
Then hollow blocks are filled with concrete base as an anchor for a solid stable wall capable of resisting pressure from soil and water.
Fill the concrete cores with crushed gravel.
Follow the block manufacturer s instructions for wall height limits.
However hollow concrete block walls are not structurally very strong and will not resist the flexural stress that a wall is subjected to causing them to collapse easily.
Of leveling sand and half the height of the first course of blocks.