External CBS wall repair - big hole

[coleman10]

Hi, all. Need some opinions on repairing a hole in an external CBS wall. A friend of mine had to have a plumbing repair that necessitated opening up the wall all the way through. The size is 22” x 9“ and is right at the foundation. Need to make sure it’s structurally sound, waterproof, and secure. I was thinking maybe fitting in some rebar and pouring in some concrete, but then that would encase the pipe and make additional repairs difficult. Perhaps fitting in some half-height blocks and then setting it all in with concrete will make it stable, but still allow for it to be broken out if another repair is needed.

I tend to overthink things, so if any of you have done this before or know the correct/best way to do it, I’m all ears.

Thanks!



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[u2slow]

I would cut up a couple cement blocks with a masonry wheel on an angle grinder. Maybe even pack in some of the rubble that was smashed out. Trim and stack them in with a modest amount of mortar on the edges so it just sticks together.

After that sets, trowel a top coat of mortar over the whole thing.

When my Dad used to do stucco... watered down white glue often got used to increase bonding between old and new. YMMV.

 

[coleman10]

Thanks. Good suggestions.




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[johnnyradiant]

I would cut up a couple cement blocks with a masonry wheel on an angle grinder. Maybe even pack in some of the rubble that was smashed out. Trim and stack them in with a modest amount of mortar on the edges so it just sticks together.

After that sets, trowel a top coat of mortar over the whole thing.

When my Dad used to do stucco... watered down white glue often got used to increase bonding between old and new. YMMV.

watered down white glue would have been Bondfast

 

[coleman10]

watered down white glue would have been Bondfast

Thanks. I'm assuming a concrete bonding agent can also be used.