0

My flagstone patio is developing cracks at the joints. I would like to know how to patch/seal them to avoid water from sipping excessively into the ground. I understand patching is not a water proof method.

What product can be used? How do match the color of the "grout"?

enter image description here

enter image description here

1
  • Matching the colour can be hardest job, but hopefully it is a common colour at near by stores. I would remove all of the loose/crack grout and redo. The local stores should the proper sealing for that grout.
    – crip659
    Jul 29, 2023 at 20:53

1 Answer 1

0

Treat it like any other failing grout situation - use a grout saw (or possibly small chisels and a mallet or hammer for some of this) to remove the failing grout, and re-grout the whole thing (and bam, matching the color is solved.)

You could also choose to replace the grout with polymeric sand, which might be a bit more tolerant of seasonal movement of the stones, since the base is obviously not preventing all movement.

1
  • Removing everything on a large patio is a big job. I only have cracks in a few places. Further, I expect more cracks over time. Thus I am looking for something to fill the cracks. How can alter the color of polymeric sand? Can it gets into the smaller cracks (1st picture)?
    – Quoc Vu
    Jul 29, 2023 at 23:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.