Driveway expansion gaps, do they need to be sealed?

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Old 04-22-19, 10:26 AM
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Driveway expansion gaps, do they need to be sealed?

My concrete driveway has expansion gaps that are unsealed, and tend to get filled with dirt, moss, etc. I live in the Seattle area, which sees plenty of rain, and occasional snow.
My questions are:

1) Do I actually need to seal it, or is it OK to leave alone? What "happens" other than collecting dirt?

2) Presuming I do, the best solution I've found is to use Sikaflex self-leveling w/ a backer rod. The problem is that my driveway is sloped. Should I use the self-leveling on the "almost level" gaps, and mix-and-match with non-sag sealant for the sloped lines? Or just use non-sag everywhere?

Thanks for any guidance.
 
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Old 04-22-19, 02:36 PM
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Here in Michigan I have sealed my joints to keep the water out which helps with freeze thaw and heaving of the slabs.

If you don't experience that cold condition then it's more cosmetic!
 
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Old 04-22-19, 04:06 PM
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Here in NC, a little colder than you in Seattle, we don't do anything to concrete expansion joints. Dirt collects in them which eventually allows weeds to sprout but a quick shot of Roundup takes care of them.
 
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