Precast Concrete Countertops
FIVE: DEMOLD THE COUNTERTOP
There are a few simple, but essential, rules to follow when de-molding a concrete countertop. Since the concrete is only a few days old at this point the risk of cracking the countertop is high and we need to be careful of where we pry and lift to insure the countertop slab is not stressed to the point of breaking. Avoid lifting the slab by its corners and prying directly against concrete surfaces with metal pry bars and screw drivers.
We strongly recommend wearing rubber gloves to avoid leaving marks on the concrete surface. The oils from your hands and fingers can soak into the concrete surface and leave recognizable handprints on the final project.
What You’ll Need
Step 1 – Remove the Form Walls
Step 2 – Remove the Faucet Knock-out
Step 3 – Roll Countertop
Step 4 – Remove the Sink Knock-Out
The concrete mix used in this pour was low-slump and required heavy-duty vibration. Add more water to your mix if you don’t have table vibrators like these.
Wet-polish with coarse diamond polishing pads that expose aggregate by cutting deep into the concrete, or use a finer pad for a more uniform finish.