Underlay is easy to overlook in a carpet specification, since it is invisible once installed, but it significantly affects comfort, acoustic performance, and how long the carpet above it actually lasts. Here is what commercial buyers should understand about underlay selection.
1. What Underlay Actually Does
Beyond adding cushioning underfoot, underlay absorbs impact from foot traffic, which reduces stress on the carpet’s backing and fibres — a well-matched underlay can meaningfully extend the service life of the carpet installed on top of it.
2. Underlay Is Not Always Used
Direct-glue installation, common for many commercial carpet tile applications, does not use a separate underlay layer. Broadloom carpet in higher-traffic commercial settings is also sometimes direct-glued rather than installed over underlay, depending on the performance requirements of the space.
3. Acoustic Performance Depends on the Full System
When underlay is used, it plays a significant role in a floor’s overall acoustic performance, particularly impact noise reduction between floors in multi-storey buildings — acoustic ratings should always be considered for the carpet-and-underlay system together, not the carpet alone.
4. Matching Underlay Density to Traffic Level
Higher-traffic commercial areas generally need firmer, denser underlay that resists compression over time, while overly soft underlay in heavy-traffic zones can accelerate carpet wear by allowing excessive movement under foot pressure.
5. Underlay and Warranty Considerations
Some carpet manufacturers specify approved underlay types as a condition of their product warranty — always confirm underlay compatibility with your carpet supplier before installation to avoid warranty complications later.
6. Moisture and Subfloor Considerations
In areas with any moisture risk, moisture-resistant underlay or a moisture barrier may be necessary beneath the underlay itself — this should be assessed as part of the subfloor survey before installation begins.
Have questions about underlay and installation systems for your project? Explore SolevoCarpet’s commercial carpet range, or contact our team for guidance on the right system for your space.