Patching holes in cinderblock foundation


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Old 08-06-02, 07:00 AM
dianemarg
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Patching holes in cinderblock foundation

Well, we managed to get the old oil tank out and taken care of. Now we have holes in the cinderblock foundation from taking out the pipes which connected the oil tank. Does anyone have any ideas on how to patch this area. There is a skim coat of stucco on the outside as well as the inside and we live in a cold climate so it needs to be sealed up well. The cinderblocks have the holes in the centre of them as well so we need to patch in such a way that whatever material we put in will not fall down the holes . All help and suggestions would, again, be appreciated! Don't know how we'd tackle some of these projects without this forum! Thanks!
 
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Old 08-07-02, 06:16 AM
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How large are the holes in your wall? Could you not just plug them with morter mix or concrete repair material? If the hole is too large for this type of repair, how about chiseling out the rest of the partial cinderblock with the hole and replacing with a whole block. Whichever way you go, then finish the surface inside and out with stucco patch material you can buy in kit form at your local building supply store.
 
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Old 08-08-02, 07:36 AM
dianemarg
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Thanks Thiggy. These holes are about 3" and 2" in diameter. We had thought to fill them with concrete patch but the problem is that there are the holes from the concrete block beneath them and the concrete patch will just fall down the holes (which are about 7 1/2 feet deep). We're trying to figure out a way to get something in which will somehow seal to the cinderblock and then fill "that" with the concrete patch but we don't know of a product that would be solid enough to hold the concrete patch and flexible enough to provide a seal to the cinderblock. Any ideas?
 
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Old 08-08-02, 07:44 AM
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Yeah, I have an idea that might work. It is one which is used sometimes when patching drywall holes. How about cutting an oval of plywood (or whatever) which is can be fitted through the hole and pulled back by a small wire threaded through the wooden patch. Hold the back-up patch in place while slathering your patching material (morter, stucco, whatever) in the hole, smoothing it flush with the surface of the block wall. Then tie off the wire protruding through the patching material with some object to hold it in place till the patch cures. You then cut off the wire and finish to suit. Good luck.
 
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Old 08-09-02, 06:47 AM
dianemarg
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Thanks thiggy! That sounds like it will work really well. We'll give it a try, just have to wait for the weather to improve (it's really wet here right now which is extremely unusual for Saskatchewan in August!) so that we can try it out. Thanks for the idea!
 
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Old 08-10-02, 01:58 PM
T
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Patching hole in cinder block

How about cutting a piece of fiberglass mesh tape to cover an area larger than the hole and coating with the patching compound. Allow additional coats to dry according to manufacturer's instructions. Use a quality masonry patching compound. Follow manufacturer's instructions for surface prep.
 
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Old 08-11-02, 07:04 AM
dianemarg
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Thanks to both of you for your ideas of patching the surface. However, we also need to somehow fill the inside cavity of the cinderblock(which is about 9" deep) made by the pipes. Due to our extreme climate we have to have some sort of insulation or at least a filler that won't allow any cold/hot air to get through. We need to fill the holes with something that will be able to hold a cement mix or ??? and that will be able to be flexible enough to mold to the crevices, lumps and bumps made throughout the hole, without falling down the centre holes in the cinderblock. Any ideas??? Thanks for your help!
 
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Old 08-11-02, 09:28 PM
bungalow jeff
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Try styrofoam insulation. You can cut it to near shape and wedge it in tight to hold the patch in place.
 
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Old 08-12-02, 04:12 AM
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How about using expanding foam insulation such a "Great Stuff" found in building supply stores? A can of that would fill up a cinder block in short order.
 
 

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