Refilling driveway slab joints?

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Old 09-16-20, 11:17 AM
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Refilling driveway slab joints?

Hello!

Most of the joint fillers in my driveway (slabs) are gone, so I am thinking of refilling them. Now, I am planning this not so much to prevent slabs from grinding against each other (house build 1963; don't know if driveway is original), but to prevent water to seep in below the slabs (to avoid softening of the soil and slab sinking and to avoid winter freezing with slab raising).

Does this make sense, and, if so, what should I fill with?

Thanks! / Hans L

 
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Old 09-16-20, 11:46 AM
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Concrete, yes??

Silkaflex self leveling urethane joint sealer!
 
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Old 09-16-20, 12:26 PM
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Concrete, yes! Thanks!

Now, my driveway is sloping (not much, but sloping), and I read "NOT FOR SLOPED SURFACES." in "PRODUCT DATA SHEET Sikaflex® + Self Leveling Sealant". Do you think this is a problem?
 
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Old 09-16-20, 04:14 PM
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I have a bit of slope to my drive.

Perpendicular is not an issue, when I fill parallel to the slope, I just fill it in layers, maybe 2 or 3 applications, it will flow down a bit there isnt enough material that if flows out much.

What I have found is with winters the slabs tend to move slightly, after about 3 years the sealer has separated from the slabs and I just pull it out and reapply!

The concrete store also carries a thicker material that does not flow but they charge about the same for a small tube vs the large tube of the self leveling!
 
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Old 09-16-20, 04:29 PM
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Thank you, Marq1.

Hans L
 
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Old 09-16-20, 04:35 PM
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As the mfg states, you don't want to use the self leveling on sloped surfaces. You say "it's not sloped much" but that doesnt tell us much of anything. If you got out a 4 ft level and could tell us how much it slopes in 4 ft, that would be much better than just blindly saying, yeah it will work.

As Marq says, you can use it on minimally sloped surfaces but you need to be very careful about it and not put too much on at once, or you will have a mess. You also usually want to have some clean silica sand handy to fill in deep cracks and to make a dam along the sides of joints needed.

But IMO you will want to have some of both on hand. Such as Loctite S10 and Loctite S20.
 
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Old 09-16-20, 07:02 PM
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Okay, Xsleeper, I will measure tomorrow. Trigonometry to the rescue :-)

Hans L
 
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Old 10-03-20, 06:06 AM
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Old 10-03-20, 06:45 AM
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LachlaLachlan was a spammer, so why you didn't understand his nonsense reply. He was banned and reply deleted.
 
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Old 10-03-20, 06:50 AM
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Aha, Shadeladie. The first one I have encountered in a forum. Interesting. Thanks for letting me know.

Hans L

PS. I have not measured the slope of my driveway yet. Will do in a while.
 
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