X-raying a slab is not always required before core drilling, but it is generally recommended as a safety precaution to avoid hitting rebar or other embedded objects. Hitting rebar can damage the core drill bit and create a hazard for the operator.There are a few methods that can be used to avoid hitting rebar without X-raying the slab: Use a concrete scanner. A concrete scanner can be used to detect the presence of metal objects embedded in the concrete. This can help you to identify areas to avoid when drilling. Drill at an angle. Drilling at an angle can help you to avoid hitting rebar that is running parallel to the surface of the slab.* Use a smaller diameter bit. A smaller diameter bit is less likely to hit rebar than a larger diameter bit.If you are not sure whether or not a slab contains rebar, it is always best to err on the side of caution and X-ray the slab before drilling. Flag for review