It works perfectly as a concrete expansion joint sealant.
How to fill joints in exterior concrete block wall.
You can also used thin wire reinforcing for concrete block walls.
This thin steel once embedded in the mortar adds significant strength to long concrete block walls.
Fill the crack with urethane caulk similar to what you would use for driveway caulk.
Filling the joints is only cosmetic but that is what the owner wants.
Apply concrete to any gaps in the blocks or mortar using a shovel.
This is to allow the walls to be hosed down when needed.
Lift the plastic once a day and spray the wall with water from a hose.
I am bidding a job to turn a concrete block building into a dog boarding kennel.
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.
How to repair cinder block mortar joints.
Cover the patched area with a sheet of plastic and secure it to the wall with duct tape.
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.
Fill in the cracks or holes with concrete.
Safety goggles cold chisel hammer masonry caulk wire brush mortar mix.
Clean the joints with water.
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.
You will need the following tools to start.
Mix up new mortar.
Remove the plastic after three days.
Snip the opening of the tube at a 30 degree angle making the opening the same size as your gap.