How To Fill Joints In Exterior Concrete Block Wall

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.

How to fill joints in exterior concrete block wall.

Mix up new mortar. I am bidding a job to turn a concrete block building into a dog boarding kennel. Safety goggles cold chisel hammer masonry caulk wire brush mortar mix. This is to allow the walls to be hosed down when needed.

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. You can also used thin wire reinforcing for concrete block walls. Filling the joints is only cosmetic but that is what the owner wants. It works perfectly as a concrete expansion joint sealant.

Snip the opening of the tube at a 30 degree angle making the opening the same size as your gap. 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. Apply concrete to any gaps in the blocks or mortar using a shovel. Cover the patched area with a sheet of plastic and secure it to the wall with duct tape.

You will need the following tools to start. Fill the crack with urethane caulk similar to what you would use for driveway caulk. Clean the joints with water. This unique product is placed on top of a row of block in the horizontal mortar joints.

Fill in the cracks or holes with concrete. 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. Lift the plastic once a day and spray the wall with water from a hose. This thin steel once embedded in the mortar adds significant strength to long concrete block walls.