When insulation is positioned under the screed, the solution is typically part of a designed floor build-up—whether for new construction or renovation.

Under-screed insulation remains one of the most common methods for reducing impact noise transmission through horizontal partitions. The performance of an acoustically efficient floor build-up depends on the system as a whole, and the resilient (elastic) layer must be selected according to the loads it will carry. Key parameters include the screed type, weight, and thickness, which directly influence the required stiffness and behavior of the resilient layer.