what is impermeable
These surfaces cannot be penetrated. Some common impermeable surfaces include concrete, asphalt and concrete/clay paving blocks. The Difference between Permeable and Impermeable. The underlying difference between permeable and impermeable surfaces and materials is the ability to allow the passage of liquids and gases. Due to the nonporous nature of impermeable surfaces, they cannot permit liquid and gas to enter and pass through like permeable surfaces and materials can.