an underlay refers to a layer of material installed between the subfloor and the floor covering to provide a smooth, even, and stable surface for the floor covering to be laid on

The underlay serves several purposes, including:

•  Noise Reduction: Underlays can help reduce noise levels by absorbing sound and preventing it from traveling through the floor .
•  Thermal Resistance: Underlays can provide thermal resistance, helping to regulate the temperature of the building and reduce energy costs .
•  Moisture Protection: Underlays can protect the floor covering from moisture damage by providing a barrier between the subfloor and the floor covering .
•  Improved Comfort: Underlays can provide underfoot comfort, making the floor more comfortable to walk on .

Types of Underlays

There are several types of underlays used in Australian commercial construction projects, including:

•  Fibre Cement Flooring Underlay: A rigid substrate used for laying floor tiles .
•  Carpet Underlay: A type of underlay specifically designed for use with carpet floor coverings .
•  Pliable Building Membranes and Underlays: A type of underlay that meets the requirements of Australian Standard AS 4200.2 .