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Old 03-26-2017, 01:23 PM   #1
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Cracked Connection; CMU to Poured


I have a very interesting situation in my basement. Where the steps leading up to the first floor from the basement were installed, they ended poured foundation short. They installed CMU to create the walls on either side of the steps and complete the foundation. The issue I have is the butt joint at the CMU and the poured foundation cracked. The former owner made surface repairs but nothing substantial. I started to V groove the crack when the mortar totally cracked out. I'm able to see inside the wall and I can see they didnt use end block and didnt fill the hollow between the CMU and the poured foundation. The only thing holding the CMU to the poured foundation was a 1/2" thick by 1" deep strip of mortar. I have two other locations in my basement with the same condition. What would be the best way to bond the CMU to the foundation and fill the crack. FYI - the I beam holding up the floor above rests on the CMU. The house was built in 1964 if that helps any.
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Old 03-26-2017, 04:42 PM   #2
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Re: Cracked Connection; CMU to Poured


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What would be the best way to bond the CMU to the foundation and fill the crack. FYI - the I beam holding up the floor above rests on the CMU. The house was built in 1964
Ayuh,.... If it's been stabil since 1964, I kinda doubt you really need to do anything,...

I'd probably just trowel some type S mortar into any visable holes, 'n call it a day,...
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Old 03-27-2017, 10:37 AM   #3
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Re: Cracked Connection; CMU to Poured


short of installing tie bars, you can't do anything,,, even if you do install the bars, i wouldn't recommend it if its stable,,, to seal the open joint, pack in some closed cell backer rod & properly install a joint sealant
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Old 03-27-2017, 02:45 PM   #4
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Re: Cracked Connection; CMU to Poured


The foundation moved enough to open the joint 1/16" maybe. Over the past 4 years, our area has experienced some extreme weather like frost going down over 50", floods, drought, etc. The public works guys have been replacing drain lines and water mains all over the city so I know the ground has been moving a lot. I have a split level and the slab on grade sunk more than I'm comfortable with.

It may not make much difference except for my piece of mind but I think I'll crack out the top CMU so I can dump mortar in the gap between the slab and the CMU. This should have been filled from the beginning so I just will feel better having it done right. I'm not sure if spraying the existing concrete down with milk will help bond it better but its worth a try. The product isnt too expensive. Thoughts?
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Old 03-28-2017, 12:25 AM   #5
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Re: Cracked Connection; CMU to Poured


The only thing you might do is seal the outside to prevent water penetration but without a basement, even that probably doesn't matter.
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