You can also used thin wire reinforcing for concrete block walls.
How to fill joints in exterior concrete block wall.
Apply concrete to any gaps in the blocks or mortar using a shovel.
Part of the project is to fill the mortar joints so as to make a smooth wall surface that can be coated with an epoxy paint.
This unique product is placed on top of a row of block in the horizontal mortar joints.
Cover the patched area with a sheet of plastic and secure it to the wall with duct tape.
Mix up new mortar.
How to repair cinder block mortar joints.
Fill the holes and cracks as deeply as you can then scrape the top over with a trowel so the concrete can patch the wall together evenly.
Remove the plastic after three days.
Clean the joints with water.
You will need the following tools to start.
Squeeze the caulk from your caulk gun so that the caulk fills the joint top to bottom and backer rod to the surface of the concrete block.
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Run the entire bead and then using your spray bottle filled with solvent or water depending upon the type of caulk you selected wet your finger and draw it down the joint to smooth and clean any excess.
Fill in the cracks or holes with concrete.
Use a smooth even motion filling the crack flush with the surface beveling it if it s against the house.
Lift the plastic once a day and spray the wall with water from a hose.
It works perfectly as a concrete expansion joint sealant.
Fill the crack with urethane caulk similar to what you would use for driveway caulk.
Snip the opening of the tube at a 30 degree angle making the opening the same size as your gap.
Filling the joints is only cosmetic but that is what the owner wants.