What is Poly Sand Haze and How to Fix?
To understand what poly sand haze is, let’s first take a look at how pavers are installed. Most pavers, regardless if it is a driveway, sidewalk, patio, or pool deck area, are laid on a compacted bed of sand. The bricks are laid out in whatever pattern you desire and are leveled to create an entire paver structure. Sand is then poured onto the paver surface and swept into the gaps between the pavers. This is typically fine polymeric sand especially designed for paver construction.
The polymeric sand joints are then misted with water. The water reacts with the poly sand and creates a binding agent that helps bind the sand particles together. However, before water is misted onto the surface, the poly sand dust left over on the surface must be completely removed. If the poly sand dust is not removed, it will create a white haze on top of the pavers. This is called poly sand haze.
The binding agent that is generated by mixing water and poly sand is what is left behind on the bricks causing the poly sand haze phenomenon. If poly sand haze has transpired on the surface, it must be cleaned with an acid based cleaner. Sometimes vinegar can be used unless the poly sand haze is severe.
Many times, homeowners and even contractors are unaware of poly sand haze. The joints are watered without first removing the poly dust from the surface, which in turn creates the haze. Worse yet, a sealer may be applied to the pavers and will actually lock in the poly sand haze. After sealing the pavers, the poly sand haze is still visible and often the sealer innocently gets blamed for the unsightly hazy appearance.
Thinking the sealer is at fault is a common occurrence, but typically the sealer is not to blame, it is simply a case of poly sand haze. If paver sealer has been applied over pavers that have poly sand haze on them, the sealer must be stripped off, the poly haze removed with a cleaner, and the pavers resealed.
Now that you know the answer to “what is poly sand haze” you will be able to avoid having this issue. Remove the left over poly dust prior to misting water on the joints to completely avoid the poly sand haze problem all together.
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