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SAN JOSE — When installing a paving stone fixture, one option to consider is the application of polymeric jointing sand. Unlike regular jointing sand, this product is instilled with a glue-like substance that goes in dry but is activated by moisture, which causes it to harden and lock the sand in place.
For some installations, polymeric jointing sand is essential, particularly those with wide gaps between stones that can result in undue movement. It’s also useful for poolside installations, where joint sand could potentially migrate into the pool. In addition to locking both the stones and sand in place, polymeric sand inhibits weed growth and keeps insects from tunneling up between the pavers.
The only potential disadvantage of polymeric jointing sand is that it reduces the flexibility of the paving structure, making it more of a monolithic, solidified surface. Because of this, if shifting occurs (i.e. ground movement, expansion/contraction), cracks can form between the joints. Fortunately, these fissures can be easily repaired—simply apply more polymeric sand, which will reseal the cracks.
Depending on the size and style of your paving fixture, you should expect to pay between $1.50 and $2 per square foot for the addition of polymeric jointing sand.