Step 2 mix the mortar according to the directions on the package.
How to build a block wall on a concrete slab.
Consider a wood shed floor treated lumber joists and plywood.
The first step in building a concrete block wall is to lay out the foundation using stakes and masonry string.
The process starts on the top of the.
An exterior wall must be placed on the outside edge of the slab so the exterior siding laps down and over the edge of the slab.
For a freestanding landscape wall this involves creating a simple rectangular outline of the planned foundation.
Repeat the buttering and laying blocks technique to build out the wall s second layer.
Fill the block cells empty cavities with concrete up to the top of the first course and trim with a trowel.
Draw an outline of the wall on the concrete with chalk and then remove the blocks.
Once this concrete has cured it will have created a bond between the block rebar and concrete slab forming a single structural unit and the rest of the blocks can be laid as normal.
Start the fourth layer with a half block and continue starting layers with half blocks every other layer until your wall has reached the desired height.
Start the third layer with a regular cinder block and build out.
Exterior wall on slab must be out on the edge.