I have a load bearing cmu block wall (roof ties into it) that a plumber had to
access inside to get to a water line to abandon. To do this he knocked out
approximately a 12" tall by 8" wide hole in the wall near the bottom with a
hammer (wall is a 10' tall and 8x4x16 open cell block not filled or rebar). See
Should I be concerned about the structural integrity of the wall being
compromised from a hole this size, or should I add any kind of support to it?
Also, what can be done to cover back up the hole?
Mix up some cement to a good "plastic" consistency, pack it into the
compromised cells and brace a piece of plywood against the wall so the
cement doesn't slump as it cures. Will be at least as strong as the
unfilled block was originally.
The advice that has already been given is good.
However, the plumber that ran his line directly over an electrical
outlet should have known better! If you are going to patch the hole
the plumber made it would be prudent to move the electrical box to a
safer location that is at least above, and further away if possible,
from the plumbing before that is done.
A hole that size near the bottom would not compromise the load bearing strength of the all at all.
4" tall open cell block? I can't say I have ever seen such. Solid 4x8x16 yes, not open cell....oops, yes I have but the open cell is very small, I have used a few myself.
Personally, I would use a chisel and a angle grinder with a diamond blade to
clean up the edges and then cut some new blocks to size to fit but using
only the face of the block not the full depth. This way the block patches
would be only 1 1/2 to 2 inches deep. Mortar them into place carefully, it
may take a couple of days because the lower levels may have to firm up
before they are stable enough to go higher. If you don't care how the patch
looks you may be able to get some concrete bricks to use on their side to
fill the hole. Structurally, the wall is fine, window openings are much
larger, something this small won't need a lintel.
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