Keystone limestone is iconic in older Pinecrest and Coral Gables homes — that creamy, fossil-flecked stone you see in feature walls and exterior cladding. It's also one of the hardest substrates to mount a TV on, because the stone is uneven, often hollow behind the facade, and chips if you drill too aggressively.
Step 1: find the backing
Limestone facades are almost never load-bearing. There's a wood or steel substrate behind, usually 1-2 inches deep. We use a stud finder rated for masonry to map the backing before we touch the stone.
Step 2: drill through, not into
We use a slow-speed diamond-tipped masonry bit and aim for the joints between stones where possible. Slow speed prevents heat buildup that cracks the stone. We drill all the way through the facade into the structural backing, then secure with through-bolts and oversized washers behind the stone.
Step 3: vacuum as you go
Limestone dust is fine and abrasive. We attach a vacuum to the drill housing, capture 99% of dust at the source. Drop cloths underneath catch the rest.
Stone-wall installs add $44 to the base price because they take longer and need different tools, but the result is bombproof — these mounts will outlast the house.
