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Compacting the sand after installing ensures that the material is densely packed in the joints and eliminates air pockets, which results in a better-finished installation. If the material is not properly compacted it remains too “fluffy” and vulnerable to water penetration and failure. In the case of a slab or stone that cannot be compacted, tapping with a 2×4 or rubber mallet is required to ensure proper consolidation. Lack of proper compaction is a common cause of joint failure.

Both the sand and the stone dust should be watered 3 times, starting with a fine mist and progressing on to heavier watering using a rinsing action until water begins to accumulate on the surface. On a hot day more water may be necessary as surface evaporation dries the water before it can penetrate the product. Please refer to our instructions and video.

High humidity or damp pavers can cause a white haze, make sure pavers are completely dry before installing polymeric sand and try to work in low humidity. A propane torch is great for drying out small wet areas. If humidity is high, work small sections and do not allow the sand to remain on the surface for a long time. White haze can also be caused by improper cleaning of the paver surface prior to water application. A fine bristle broom cleaning and blowing with a leaf blower until dust does not rise from the surface is necessary before activating the product. You should blow the dust off from several different directions. If the paver or stone surface is textured, blowing the surface off after the final watering with a leaf blower will help to prevent any white pockmark type stains from forming due to ponding water in clefts and crevices.

A white haze can be removed with efflorescence cleaner or a hot pressure washer. CasaScapes products do not contain any Portland cement, so any hazing is easily removed and will weather away naturally with time and rain.

The best way to remove polymeric sand from a paver surface is to use a hot water pressure washer 180°F. The heat will reactivate the polymers in the product and allow the sand to be stripped away. If it is a smaller area use boiling water.
Using a utility knife cut the polymeric sand all around the paver. Then scrape out as much material as possible. Use a paver extractor to wiggle the paver back and forth until paver can be removed. An alternative method is to break one paver into pieces, then adjoining pavers can be removed manually by hand. Or wait till after a rainfall softens the material or run a sprinkler on the surface a couple of hours the evening before, do not allow the area to dry before attempting removal.
Polymeric sand and stone dust will not crack on their own − any cracking that occurs is a result of movement − movement of the pavers or natural stone, usually a rocking motion that will cause cracking. Polymeric sand and stone dust, are intended to help prevent weeds, erosion, burrowing insects, and does not have shear strength, like concrete. Pavers and natural stone need to be properly supported by the base and in the case of pavers, they must actually touch each other to function as they are intended.
Polymeric sand and stone dust should be installed 1/8 of an inch below the surface of the paver or stone and set below any chamfered edge. Polymeric sand will expand slightly when wet and could possibly expand above the surface of the surrounding material resulting in it being tracked out of the joint.
We do not recommend doing this – we recommend that the entire joint depth be filled with our sand or stone dust product in order to ensure that you have a successful installation. Without a firm densely packed base water and ice can work their way into the joint and cause the material on top to fail. It is also next to impossible to evenly fill up half a joint with one material − you will have some areas halfway and some areas where they are 7/8 of the way full. We refer to this as topping, this can cause the sand to fail and come out of the joint. Furthermore doing this is also a false economy your labor to attempt doing this will greatly outweigh any anticipated savings in material.
Our product is considered “rainproof” in one hour at temperatures over 32°F degrees. That being said, the product obviously will cure faster on a sunny 95°F degree day with 0% humidity than on an overcast 35°F day with 80% humidity. There is also a difference between a drizzle or even a steady rain and a tropical downpour of 4 inches per hour. Try to use some common sense when installing the product and if the weather is suspect try to wait for more ideal conditions.
Any joint that grows mold and mildew does so because of an underlying moisture problem − simply stated, the area remains wet and any area that remains wet will grow mold and mildew. There is nothing in the product that can cause mold or mildew growth. A diluted pool algaecide is an excellent solution to the problem − simply spray it on several times a year to prevent growth.