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A layer of exposed aggregate concrete should be 1 to 2 inches thick if you’re installing it on top of existing concrete. If you’re pouring a new slab with the finish, slab thickness will depend on the application. Exposed aggregate concrete driveways should be 4 to 6 inches thick in most cases or 8 to 12 inches for commercial vehicles. Sidewalks, patios, and walkways should be 4 inches thick.

Small cracks should be filled with a flexible crack filler, like a rubberized asphalt-emulsion crack filler or a flexible masonry crack filler. Larger cracks need something a bit more solid to prevent further movement and to avoid having to use too much of the flexible filler. For concrete, you can use a concrete backer rod while asphalt can handle sand, gravel, or even dirt.

In general, crack fillers last for about two years on average. That timeline can be shorter if you have extremely harsh winters or longer if you live in a mild climate. Luckily, this product is pretty affordable at the hardware store (about $10 to $30) and easy to DIY, so redoing it every few years shouldn’t be too much of a hassle.

For thin driveway cracks that aren’t widening or lengthening, a polyurethane crack filler is usually the best way to seal the crack and prevent further damage from water and ice. If you have cracks that are more than ⅛-inch wide or driveway cracks that continue to grow, you should call in a professional driveway repair company to fix underlying problems—like insufficient support from the soil underneath—before filling in the cracks. An epoxy sealant is a better option for wider cracks after the surface is leveled and the underlying problem is fixed.