Hi. I had to chisel away a small section of the exterior stucco / concrete to fix a pipe. The hole is about 1" deep, I can see the tar paper; it's about 2-3 inches wide and high.

As you can see in the pictures, I now have a copper pipe coming out; what is the best way to patch the concrete now? Which product should I use?

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If you could find someplace where some stucco is being applied they would probably give you an handful. Otherwise what will work is some quickcrete patching material of some kind. Buy whatever is in the smallest quantity, mix it according to the directions and press it well into the hole and screed it off flush with the surrounding. Get some paint of the same color to match the color.
Make sure that the wire in the hole is not making contact with the copper anyplace on the pipe to avoid electrolysis.

 

I've used the buckets of pre-mixed stucco patch for small corner repairs and holes and it worked quite well. Might not be a Pro way to do it, but the repairs still look fine after 6 years.

And I agree...put some foam or tarpaper around the pipe or maybe even clip out the wire sections that might touch with use and movement over time. Can't believe it would hurt anything.

 

Thanks! I have some more questions: it seems to me there is an "outer" layer that is slightly different, maybe 1/4" or so deep. Do I need to care about that? Is it important to "paint" to give water resistance? Thanks for the advice about the wires, I will make sure they do not touch.

 

Real stucco is applied in several different coats of various names. No need to do that for a hole repair. Painting is more just to match the color since whatever you use will be a grayish color. No reason to try to tint to match for such a small area. Just take a relatively large chunk of what you chipped out and you can get a paint match. Otherwise it will be hit or miss. You want a flat exterior or masonry paint. I used regular cheap flat exterior paint for repairs on my fences and walls. Can't even see the areas in sunlight. They do look different when it rains as the painted areas don't absorb as much moisture.

 

Oh I've already got rid of all the chips But maybe the previous owner left some paint in the shed. Thanks!

 

On a patch this small the material is not too critical. Press it well into the hole and press it well against all the edges. Just be sure to keep it flush. But don't use a drywall material to do this. You want some kind of Portland cement based material so it will stand up in exterior conditions.

 

OK... do you think something like this will be OK? From the description, it seems it's to "resurface"...

SAKRETE 10 lb. Top 'N Bond Concrete Patcher-65455001 at The Home Depot

 

Since no one mentioned it yet, you'll get a longer-lasting repair if you first remove all of the loose gobs of hardened stucco in the opening. Any concrete repair product will perform best when adhering to tight, sound surfaces. Might require some dexterity with a needle-nose pliers if your fingers are as fat as mine.

 

Yes that is fine material. Press it well into the voids and use something that will bridge from side to side and top to bottom to screed it off flush before it sets.
Don't mix the whole bucket. You only need a cup full of mud.
BridgeMan45's comment is a good one. It will only take a few minutes. You can then use some air pressure to blow out the dust.

 

Thanks!!! I will use compressed air and a shop vacuum and trim with pliers. The description of that product mentions 1/2inch layers, but that is only for pavement resurfacing right? Do you think it makes sense to use a disposable, heavy duty pastry bag to push the product in?

 

Use a putty knife or a spoon or a paint stirring stick -- anything to push it in spread it around. As long as the material does not sag and run out you can do it in one layer. I think if you mix it soft enough to spread but stiff enough it won't run that it will work perfectly. Once you try it it will come naturally. This is not a big deal. If it truly sets in about a half hour you can certainly do it is smaller layers. As soon as one is set you can do the next. It does not have to dry overnight or anything like that.