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Briandl79
 
Gaps In Concrete?

I have these gaps between each section of concrete and it sucks because all kind of leaves, debris, and tools can fall into these gaps. There used to be some type of black tar like substance filling them at one point but it either wasn't done properly or just fell apart over time. You can still see remnants of it.

The biggest gap is just over an inch and the smaller ones are more like half an inch. I also have a couple of spots where the concrete has chipped away from the top.

I'm assuming I'll get recommendations to just use what was there before, but I don't even know what it's called. Any other recommendations would be nice as well.

TIA.



Old 09-26-2011, 12:48 PM Briandl79 is offline  
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Coqui
 
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Can't see the images at work (due to being blocked) but what you're looking for I think is called control joints.
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Old 09-26-2011, 12:53 PM Coqui is offline  
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d114
 
Looks like someone tried to fix it with roofing mastic.
Fill it all up with RTV. the Blue one.

Do you live in a frost prone area?

some of those gaps look like they exceed the width of the bigger foam strips you can stick into them. In that case, I'd probably grout. (there's a certain grout they use in levelling out large structural steel on concrete, I'd use that one)
Old 09-26-2011, 12:57 PM d114 is offline  
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Briandl79
 
Nah I live in South Texas. RTV?

I Googled a bit and found the backer rod it sounds like you are talking about. If it's too big, couldn't I just use more than one piece? Is RTV the best stuff to use? When Googling concrete gaps and backer rod I saw mentions of concrete caulk but not RTV specifically.

When I think RTV I think the stuff I use to seal transmission pans.

Last edited by Briandl79; 09-26-2011 at 01:13 PM..
Old 09-26-2011, 01:05 PM Briandl79 is offline  
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Jehannum
 
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I hammered lengths of 2x4 into some of the worst gaps on my driveway.

They tend to degrade over time, but I live in NM, so it's not going to rot, just dry out.
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Old 09-26-2011, 04:58 PM Jehannum is offline  
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Briandl79
 
I think the gaps are too uneven to use wood. The one gap is too big for any of the backer rod I could find. I *might* be able to fill it by using the biggest I can find and then braiding it.

If not does anyone think I can use pipe insulation? They have it in polyethylene and rubber.
Old 09-26-2011, 06:19 PM Briandl79 is offline  
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[H]ard|On
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The usual way to deal with gaps in concrete is to fill them. You can use either cement - or if the plates exhibit a lot of movement in respect to each other you can use an elastic filler that is usually used to seal around swimming pools. Fill the bulk of the gap with fine sand and then pour the elastic resin over the top.

a product called "Deck-O-seal" and there are other generic equivalents.
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Old 09-26-2011, 08:51 PM [H]ard|On is offline  
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M-Unit
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we filled the gaps around our pool with elastic filler and it lasted several years at least.
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Old 09-26-2011, 09:00 PM M-Unit is offline  
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Time2Kill
 
Just go to Home Depot, to the Building Materials aisle (usually against wall just behind Lumber aisles) and they have a whole section of Cement repair stuff exactly for this type of crack/joint. They have cement like fillers, elastic fillers, joint compound etc. I'd recommend something flexible as those all look like small sections and are likely moving a small amount.
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Old 09-26-2011, 10:30 PM Time2Kill is offline  
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Quote:
Originally Posted by Time2Kill View Post
Just go to Home Depot, to the Building Materials aisle (usually against wall just behind Lumber aisles) and they have a whole section of Cement repair stuff exactly for this type of crack/joint. They have cement like fillers, elastic fillers, joint compound etc. I'd recommend something flexible as those all look like small sections and are likely moving a small amount.

Joint compound is for drywall

http://en.wikipedia.org/wiki/Joint_compound
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Old 09-27-2011, 04:39 AM [H]ard|On is offline  
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Ezekial
 
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good topic.

I have this same issue in my driveway. I really need to do something about it soon. I
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Old 09-27-2011, 09:45 AM Ezekial is offline  
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