Underlay is the invisible layer that decides how your floor feels, sounds and lasts. The right choice depends entirely on which floor you’re laying — and sometimes the answer is “none at all”.
Hybrid flooring: check the backing
Many hybrid planks have pre-attached IXPE or another backing. Do not add a soft second underlay unless the flooring manufacturer expressly approves the complete system; too much movement can damage click joints and affect warranty cover. If the product needs separate underlay, use the specified type. Any moisture barrier is a separate requirement: follow the selected product’s instructions for the actual subfloor, including moisture testing and barrier details.
Laminate: match the product
Check whether the selected laminate has an attached backing or requires a separate underlay. Use the manufacturer’s approved density, thickness and moisture-control system. Underlay does not replace subfloor levelling or moisture assessment. In apartments, the complete floor assembly must also meet the building’s acoustic requirements; adding a thicker or softer layer without approval can compromise the flooring system.
Vinyl planks: follow the format
Glue-down vinyl is generally bonded to a prepared subfloor using the specified adhesive; use an acoustic layer only as part of an expressly approved bonded system. Click vinyl products vary: some have attached backing and others need a specified separate underlay. Follow the exact product’s instructions rather than assuming the hybrid rule applies to every vinyl plank.
Carpet: comfort and lifespan
Carpet underlay affects comfort, support and lifespan. Select the type, density and thickness to match the carpet manufacturer’s requirements and the room’s use; stairs and heavy-traffic areas may need a different specification. Check suitability before choosing by softness or thickness alone.
Apartments: check acoustic requirements
Obtain the building’s acoustic requirements and approval process before ordering hard flooring. Check evidence for the complete proposed floor, underlay and building construction. An attached backing, advertised star rating or test for a different floor assembly does not automatically establish compliance. Ask our team for the available product documents and confirm the proposed system with the building manager or acoustic adviser where needed.
Need a hand? Call us on 1300 477 699, browse flooring accessories, or order samples to compare thickness and feel at home.