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Choosing the Right Countertop Slab Thickness

Choosing the correct thickness for your kitchen or bathroom countertop may seem like a minor decision, but in fact, it is one of the most important decisions you will make when selecting new granite or marble countertops. The thickness of the slab affects the price, the installation method and the breaking strength. Most granite and marble slabs are available in ¾” (2 cm) or 1-1/4″ (3 cm) thickness. The 3 cm thick slabs have a better value in the end than the 2 cm slabs. Apart from technical reasons, the 3 cm material has a better edge appearance as the profile can be manufactured in more detail without having to roll the edge. A rolled edge is where a thin strip of the same material is applied under the perimeter of the countertop before the profile is cut. This treatment is regularly used on 2cm worktops to make them appear thicker, but the downside is that the seam between layers will be visible.

It is common to assume that 2cm material is less expensive because it is thinner than 3cm, but that is a myth. It is true that the cost of the material is lower when comparing the slabs, but the handling and manufacturing costs are the same as those of the 3 cm material since the process is the same regardless of thickness. Although the 3 cm slabs weigh more, the 2 cm ones cost the same in material handling because they require more attention and care to avoid breakage. 3cm thick granite and marble countertops are strong enough to support their own weight when installed on cabinet bottoms. 2cm thick countertops are usually installed on top of a 3/8″ plywood deck to increase its strength and weight resistance.

2cm marble countertops are more prone to cracking because it is a softer stone. It has become a popular choice for bathroom vanities because it has a “lighter” appeal in both color and thickness. With proper care and attention to maintenance, marble is better suited to the bathroom. 3cm thick granite slabs are the best choice for kitchen countertops due to its strength and resistance to staining. When the edge profile is solid without seams, it gives the countertop greater value and is best used in a high utility area such as a kitchen. Another benefit of using 1-1/2″ material in the kitchen is that it can support up to 12″ overhang clearances with concealed or decorative brackets. This is especially helpful in an eat-in kitchen where there are bar stools along the cabinet.

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