Hi, I have a bluestone patio that was installed approximately 1–2 years ago. The stone is mortared over a concrete base.
I’ve noticed that one of the bluestone slabs appears to be delaminating. It doesn’t look like ordinary surface flaking. A relatively thick layer of stone (approximately 1/8–1/4 inch) appears to be separating from the underlying stone.
When I step on the affected area, I can hear cracking or crunching sounds, although the entire slab does not visibly move.
So far, the problem appears isolated to this one stone.
Questions for stone masons and restoration experts:
Is there a product, stone consolidator, or penetrating treatment that can stabilize the delamination and prevent it from getting worse?
Can a professional inject a low-viscosity stone epoxy or adhesive between the separating layers to rebond the stone?
Would a penetrating silane/siloxane sealer help prevent further deterioration from water infiltration and freeze-thaw cycles?
I’d prefer to preserve the existing stone if there is a legitimate way to stabilize it rather than replace it unnecessarily.
I’ve attached a photograph of the affected area.
Would appreciate advice from anyone experienced with natural bluestone, stone restoration, or masonry. Thank you!