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Old 03-19-2017, 06:37 PM   #1
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Paver Discoloration

About a year ago we had paves installed. A handful of stones had to be replaced a few weeks later when some paint was splattered on them. Now, whenever it rains or gets wet, those particular stones get a chalky white discoloration to them. Wetting them down makes it go away, but after they dry it looks even worse.

Wondering what might be causing that. My initial thought was that the replacement stones were never sealed properly. If I apply sealer to those stones at this point do you think that would fix the issue? And if so, any recommendations for a paver sealer?

Also, after a little over a year I'm noticing quite a bit of sand between the paver joints has eroded away due to rain / heavy wind. The paver joints are large than most I've seen. But even so, how long should properly sealed paver joint last before starting to notice erosion?
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Last edited by jlutsky; 03-19-2017 at 06:40 PM.
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Old 03-19-2017, 10:33 PM   #2
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Re: Paver Discoloration

Those pavers could be from a separate lot and therefore have different characteristics than the other stones.

You could try sealing one of the stones in question in and small are and see if it takes on the color of the others.

Sand does need to reapplied depending on what was used. The good masons on the forum will be able to make recommendations on that.
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Old 03-22-2017, 04:35 PM   #3
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Re: Paver Discoloration

wash's explanation's as good as any that i could conjure up altho you might want to seal the underside rather'n the tops
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Last edited by stadry; 03-22-2017 at 04:59 PM.
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Old 03-22-2017, 05:22 PM   #4
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Re: Paver Discoloration

As Wow said, the new stones might be from a different batch with a slightly different composition. The white stain is likely efflorescence - minerals leaching out of the concrete. Try a stiff scrub with water. Maybe a couple of times. At some point the minerals become less soluble and can only be etched with an acid solution.

Sweeping in more sand is not unusual in the first year or two. Regular sand will pack; polymeric sand will 'set' a little harder. If it continually washing out you probably have a drainage problem either across the surface or down through the base.
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