How To Fill Joints In Exterior Concrete Block Wall

This is to allow the walls to be hosed down when needed.

How to fill joints in exterior concrete block wall.

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. Remove the plastic after three days. Lift the plastic once a day and spray the wall with water from a hose.

Snip the opening of the tube at a 30 degree angle making the opening the same size as your gap. I am bidding a job to turn a concrete block building into a dog boarding kennel. 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 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.

You can also used thin wire reinforcing for concrete block walls. 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. Mix up new mortar. Filling the joints is only cosmetic but that is what the owner wants.

How to repair cinder block mortar joints. Fill in the cracks or holes with concrete. Clean the joints with water. You will need the following tools to start.

Fill the crack with urethane caulk similar to what you would use for driveway caulk. This thin steel once embedded in the mortar adds significant strength to long concrete block walls. It works perfectly as a concrete expansion joint sealant. Use a smooth even motion filling the crack flush with the surface beveling it if it s against the house.