We saved money where we could, as usual, but learned a lesson about filling patio joints the hard way. After finishing our patio, we used leftover paver sand to fill the cracks instead of buying polymeric sand from the stoneyard. It was an easy, cheap choice—until a few weeks and several rains later when the sand began to wash out and leave glaring gaps between the stones.
At first the regular paver sand looked fine. The grooves between the pavers were full, and the patio had a neat, finished appearance. But the sand didn’t lock in place: rain either compacted or washed it away in sections, creating an uneven look and exposed joints that invited weeds and ants.
After the first rains, it became clear this wasn’t going to be a long-term solution.
We finally decided to spend the extra money and bought a bucket of polymeric sand from Lowe’s for about $30. Polymeric sand contains additives that bind like cement when damp, helping to keep joints stable and deterring weeds and insect nests. Although the bucket was intended to cover only a portion of the patio, the existing regular sand left in the base of the joints allowed the polymeric sand to go further. One bucket filled the cracks and we still have some left for future touch-ups, so we avoided the larger $95 delivery charge the stoneyard quoted.
Installing the polymeric sand was a tedious, hands-on job. Following the directions, we used a Ziploc-style bag with the tip snipped off to pour sand directly into every joint. There were many cracks to fill, and that step took patience. I learned that a light touch and even distribution make the biggest difference.
The first fill was too heavy, and that’s not ideal because polymeric sand really hardens after it’s wet. You don’t want excess material on the paver faces—only in the joints where it should set. I spent some time sweeping each section to thin the sand to the right level so it would lock into the cracks and not cling to the stones themselves.
Working section by section, I smoothed and swept until the seams looked consistent and natural. Afterward I used a leaf blower on its lowest setting to remove any remaining sand on the surface, taking care not to disturb sand packed in the joints.
The final step was to mist the entire patio with a hose, following the product instructions: moisten the joints evenly without over-washing the sand out. In hindsight, I would have removed just a touch more surface sand before dampening so the seams looked slightly thinner and more worn-in. Still, once cured the polymeric sand blends in nicely and avoids the “too-new” contrast that fresh, bright joints can create.
Although we saved roughly $60 by starting with regular paver sand, I wish we had spent a little more and used polymeric sand from the outset. It would have saved time—my first attempt with paver sand required several re-sweeps, while the polymeric sand only needed one careful application—and likely provides better long-term defense against weeds and ants.
About a month after applying the polymeric sand and after several heavy storms, the joints still look solid and consistent. We waited to share our experience until we could confirm it held up to weather. So far, the polymeric sand has satisfied our expectations and I’m relieved it worked—redoing the whole application would have been a lot of extra work.
Have you ever cut corners and then wished you hadn’t? I’d love to hear your stories about projects where spending a little more up front would have saved time, frustration, or extra expense later. Sharing those lessons makes the next DIY job a little less painful for the rest of us.
If you want to review the patio project from start to finish, the original series covered planning, prepping, unexpected budget changes, base work and the final installation—all useful references if you’re tackling a similar DIY patio.