Understanding the Concrete Slab Defect Honeycombing During Construction When a new home is being built, most homeowners expect the concrete slab to look smooth, solid, and uniform. Occasionally though, areas of rough, porous concrete may be visible along slab edges, beams, or around penetrations. This defect is commonly referred to as Concrete Slab Honeycombing, and it is something independent inspectors sometimes identify during staged construction reviews. Honeycombing gets