How to Avoid Damage When Transporting Countertop Slabs

For secure transport of countertop slabs, rest them vertically against an
A-frame, use plenty of protective padding, and strap them in place to
prevent movement.

Question:
How can I securely transport precast countertops to the installation site and minimize the risk of cracking or chipping?

Answer:
Too much time and effort goes into making a high-quality concrete countertop to risk cracks or damage from improper transport. To reduce the risk, it’s best to transport and handle concrete countertops in a vertical position, much like sheets of glass. That’s because concrete countertops are beams, so they are stiffest when oriented vertically and most flexible when flat. Good examples of this are floor joists and roof rafters. Both are commonly set on the narrow 2-inch edge, rather than flat.

When a beam deflects, it creates compression in one face and tension in the other. The less the beam deflects, the lower the tension forces. (To learn more about the interplay between compression and tension forces in beams, read “Countertops Are Beams, Not Slabs on Grade.”) Concrete is strong in compression and weak in tension. In properly designed countertops, the primary reinforcing is located near the bottom, which is generally the tension side. However, if a countertop is transported flat, it will survive the trip only if the unreinforced portion of the concrete never experiences tension forces that exceed its very low tensile strength. If a countertop were transported upside down, it would almost certainly crack, probably in several places.

Small, compact slabs can often safely be transported flat (and right side up) because they don’t deflect much. However, long slabs have a greater tendency to flex, and a sudden pothole or bump in the road could cause a large shock and overload the concrete, resulting in cracking. By orienting the slabs vertically, the deflection of such a deep, stiff beam is negligible. Therefore, tension forces in the slab remain very low, which tremendously reduces the risk of cracking.

When transporting countertop slabs, use A-frames or L-frames (one side of an A-frame) to support and secure the slabs. These frames are often made of galvanized steel rigidly welded to provide a sturdy structure. Some countertop fabricators construct their own wooden frames, but these must be made very sturdy and rigid to protect the countertops. Either way, use padding to protect and separate the slabs from the frame and each other, and straps or clamps to keep the slabs from moving or shifting.

To carry individual slabs, always use two or more people. Special lifting straps and carry clamps that grab onto the edges of thinner slabs make handling safer and easier, especially for large, unwieldy slabs. You can also use rolling carts or dollies.