Fill the concrete cores with crushed gravel.
How to build a wall out of concrete blocks.
But for diyers retaining wall blocks made of concrete are the best solution.
Make sure joints between cap blocks are filled with mortar and smoothed with the finishing tool.
If your wall is straight line up the first layer of cinder blocks from one end to the other end.
Prepare the footing spread mortar and build leads sliding the block over the rebar as needed.
It should be a mixture of sand and cement 4 1 diluted with water to consistency suitable for work.
Starting at one end of the wall lay out the cinder blocks end to end until you reach the first turn in the wall.
And that crooked block will affect the one above it and so on.
How to do it.
Before you start lay out and pour footing.
Retaining walls can be build of many different materials including wood timbers bricks or natural boulders.
Build end leads to corners.
Check the level and alignment of all blocks as you go along adjusting them with a rubber mallet.
Heavy retaining wall blocks the blocks we used in our demonstration weigh 14 pounds each keep the soil at bay with their weight.
Install the first course of blocks using a taut string line to establish a straight row.
Level to level blocks lengthwise and a torpedo level to level the front to back.
Build the footing and insert rebar into the wet concrete at intervals corresponding to the cores in the blocks.
Put 3 8 inch 0 95 cm plywood spacers in between the blocks.
Lay the first course staring at one end place the first course of concrete blocks top side up on the crushed rock with the front lip facing up and towards the front of the wall.
You can also buy a ready dry mix glue which is diluted by simply adding water and stirred with a drill with a special nozzle.
Even a pebble on the surface of stackable retaining wall blocks will throw the one above it out of alignment.
Once the first row is installed pack native soil to grade level on both sides of this course to anchor the wall in place.
Build up the wall.
How to build a concrete block wall with your own hands first it is necessary to prepare a solution for masonry.
Lay out the wall and excavate the slope and the footing trench.
That little stone will eventually create an unattractive hump in the top course.