Patio
Thank you for the answer on my patio. the patio is on a 4" cement base and then a layer of sand. Would the moisture still be coming from the bottom. and only some of the bricks have this white dusting on them. I tried brushing the bricks but it doesn't seem to come off. What if I used some acid wash to remove it?
Kevin...
Expert
The moisture could be coming up from the concrete - when it rains, water will drip into and around the bricks. Some will pool on concrete below, and will absorb into the concrete. I would be hesitant to use an acid wash for fear of deteriorating the surface of the brick itself. You can try rinsing / spraying the bricks to see if that helps dissolve and wash off the staining. If that doesn't work, consult with the brick manufacturer before using any harsh chemical cleaners.
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