Standard self-leveling underlayment is engineered primarily for compressive strength, smoothness, and flowability rather than structural load-bearing capacity, meaning it is not a direct substitute for structural concrete slabs. While high-quality floor levelers typically achieve compressive strengths ranging from 3,000 to 5,000 psi—comparable to standard residential concrete—they lack coarse aggregate reinforcement and tensile strength. Therefore, self-leveler is designed solely as a thin topping or underlayment layer to flatten subfloors, whereas structural foundation concrete is meant to bear massive structural loads across unsupported spans.
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