Double the wall height to 8 feet and you would need a wall that s eight times stronger to do the same job.
4 foot concrete retaining wall design.
And secure one row to the next with pins.
Also as walls get taller they get exponentially more difficult to design and build.
In most states retaining wall designs taller than about four feet must be designed by or approved by a qualified licensed professional engineer.
The typical installation procedure for a simple retaining wall less than 4 feet tall on good soil is described in this article.
It is advisable to get local building department approval for the design however.
Of leveling sand and half the height of the first course of blocks.
Particularly retaining walls can assist you on keeping the soil on one side of the structure enabling a lower floor level on the other side of the wall.
A 4 foot high 15 foot long wall could be holding back as much as 20 tons of saturated soil.
Excavate the trench to about 3 feet wide and to the desired depth generally 12 inches.
Line out the foundation trench on the ground.
Tall wall excavate a trench deep enough to accommodate 4 to 6 in.
Of compacted base 1 in.
With forces like these in play you should limit your retaining wall efforts to walls under 4 feet tall 3 feet for mortarless stone.
An 8 foot tall retaining wall must be eight times stronger than a 4 foot tall wall.
Step succeeding courses back 3 4 in overlap vertical joints at least 4 in.