If the holes were smaller i would use hydraulic cement which actually slightly expands as it cures with about a 3 4 minute working time.
Concrete hole in block wall.
To repair small cracks or holes in cinder block walls you can use concrete.
Hose the wall down or scrub it with a washcloth then use a metal file to smooth out any rough edges.
As moisture fills the holes and the temperature changes the edges will grow brittle and crumble.
The major cause of cracks and holes in most concrete foundation is water.
Patching a hole in a cinder block wall requires some time along with the appropriate materials to make the repair.
Holes this large make that type of fix impractical.
As much as you will be using the core drill a standard drill is still required in the initial stages to make the guide hole before you can fully switch to a core drill.
When you have to drill large holes into concrete such as the 2 inch or 4 inch holes you will need to use a core drill.
A standard drill bit is not large enough to make such a hole.
Drill a hole at each corner of the opening outline with a 5 8 inch masonry bit.
First clean any parts of the wall that you plan to repair so the cement or mortar adheres securely.
Have the confidence to try and you will be successful.
When water seeps into the foundation holes and cracks are created.
However just like any other material concrete blocks also degrade through time.
After hearing that i seriously considered just gluing a piece of plywood over it and calling it a day.
Concrete blocks tend to be more visually striking and stronger than poured concrete.
We will discuss the process later in this guide so keep reading.
Repeat the process on the other side of the wall.
Put the concrete epoxy cement on the caulking gun open up the tip to draw out a small amount and squeeze it smoothly into the crack.
Step 4 choose which side you will start with and punch a hole in the other side with a sledgehammer which will help draw concrete dust away from you as you cut through the wall.
Concrete block wall repairs are within the skills of do it yourself people.
Then mix your concrete with water mist the cracks with water until they re damp and fill the areas with concrete.
Step 1 chisel out any loose pieces of cinder block around the edges of the hole and brush away any loose debris with a nylon brush.
I just like to show you a little trick some time you have to install dryer went through the concrete walls all what you need is a cut off wheel and a littl.
If you do have hollow cinder block walls then yes you will need to use a filler like spray foam for areas the holes go all the way into the center.