Author Topic: How would you fix a hole in a cinder block wall?  (Read 955 times)

mies

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How would you fix a hole in a cinder block wall?
« on: February 17, 2019, 08:13:12 AM »
Several years ago, I needed to have my breaker box and sub-panel rewired in my basement. I had to take down some 1960's vintage rumpus room wood paneling so the electrician could get to the conduit that linked the two boxes, and so he could run some additional conduit. When I pulled down one section of paneling, I found that one of the previous owners got lazy with the wiring routed behind the paneling. At one point, there was a junction box with a light switch mounted to the cinder block wall behind the paneling. Instead of removing the junction box and rewiring everything so it would fit behind the paneling, he just knocked a hole in the cinder blocks for the foundation and pushed the junction box into it. I attached a photo to illustrate.

I've been trying to either remove or fix a lot of the handyman hacks from the previous owners. I've ignored this one for years because I wasn't sure how difficult it would be to try to fix on my own. Fortunately, the cinder blocks are not part of an outside wall. There is a cinder block wall that essentially divides my basement in two. This is on the inside dividing wall.

At some point, I would like to get rid of the rest of the wood paneling, fix all the little pock marks from where the masonry nails used to attach the paneling, and just paint the cinder blocks a glossy white. Since this would be exposed, I want to  make sure it looks right.

Has anyone ever had to fix something like this before or have any ideas for how to fix it properly?

Thanks!

Rob_bob

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Re: How would you fix a hole in a cinder block wall?
« Reply #1 on: February 17, 2019, 05:59:36 PM »
Probably mortar mix or cement.  Mix it thick and built it up from the bottom of the crack.

Reynolds531

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Re: How would you fix a hole in a cinder block wall?
« Reply #2 on: February 18, 2019, 06:48:19 AM »
After you fix it's a good bet texture wouldn't look right. If that's an issue check home depot for two part epoxy tile refinishing mixes. Can't recall the brand.

Gone Fishing

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Re: How would you fix a hole in a cinder block wall?
« Reply #3 on: February 18, 2019, 07:08:15 AM »
Type N mortar, mixed with just enough water that it smooths out and is not crumbly.  Use your finger, spoon, or other tool that matches the contour of the joints to put in faux joints.  For the nail pocks, I am not sure the mortar would have enough adhesion, try it, working it in to the pock firmly, but if it doesn't work, I'd just use drywall compound.  If it matters, you might find some type of texturing tool to roll over the repairs to help them match.  Don't rule out play dough or pastry tools, just play with them and see what you can do.

mies

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Re: How would you fix a hole in a cinder block wall?
« Reply #4 on: February 18, 2019, 07:51:12 AM »
Thanks for the suggestions guys! Iíll look into that.

Cadman

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Re: How would you fix a hole in a cinder block wall?
« Reply #5 on: February 18, 2019, 09:23:59 AM »
You're going to need some sort of backer board or all your mortar is going to slump to the inside of those blocks. There are some 1/4" thick tile backer boards that can be cut and snapped like drywall that you could slip through the hole and pull flush from the inside. Wire or screw them in place using a 1x2 or piece of rebar across the front of the hole; this should hold them until your mortar sets, then remove the wire/rebar and fill those voids.

Fishindude

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Re: How would you fix a hole in a cinder block wall?
« Reply #6 on: February 18, 2019, 11:02:57 AM »
Get that conduit and box out of the way, stuff the big void full of wadded up paper so you don't need a ton of mortar, then patch with stiffly mixed masonry mortar.
Buy a cheap sponge trowel and finish it flush with block surface.