Best Underlay for Floating Floors in Australia (2026 Guide)
- Imperial Flooring Australia
- Jul 9
- 4 min read
If you're installing a floating floor, choosing the right underlay is just as important as selecting the flooring itself. A quality underlay improves comfort underfoot, reduces noise, protects your flooring from moisture and helps extend the lifespan of your investment.
Whether you're installing engineered timber flooring or laminate flooring, the correct underlay provides a stable foundation while enhancing the overall performance of your floor.
In this guide, we'll explain the best underlay for floating floors in Australia, the differences between foam and acoustic rubber underlays, and which option is best suited for your home or project.
Why Is Underlay Important?
Many homeowners focus solely on the flooring they purchase, but the underlay hidden beneath the floor plays a significant role in its long-term performance.
A quality underlay provides:
Improved walking comfort
Reduced impact and airborne noise
Moisture protection over concrete slabs
Protection for click-lock joints
Increased thermal insulation
A smoother installation
Longer flooring lifespan
Without a suitable underlay, floating floors can sound hollow, feel harder underfoot and become more susceptible to movement and premature wear.
Which Flooring Requires Underlay?
Flooring Type | Underlay Required? |
Floating Engineered Timber Flooring | ✅ Yes |
Floating Laminate Flooring | ✅ Yes |
Hybrid Flooring with Attached Underlay | ❌ No |
Glue Down Engineered Timber | ❌ No |
Glue Down Herringbone Flooring | ❌ No |
If you're installing engineered timber or laminate using a floating installation method, underlay is essential.
Best Underlay for Floating Floors
There are two primary types of underlay commonly used throughout Australia.
1. 3mm Silver Foam Underlay
For most Australian homes, a quality 3mm foam underlay offers excellent performance and value.
Benefits
Excellent value for money
Built-in moisture barrier
Reduces walking noise
Easy to install
Suitable over concrete and timber subfloors
Ideal for floating engineered timber flooring
Perfect for laminate flooring
This is the most popular choice for standard residential homes and renovations.
2. 3mm Acoustic Rubber Underlay
If premium acoustic performance is required, high-density rubber underlay is the superior option.
Benefits
Excellent sound reduction
Higher density construction
Better underfoot comfort
Ideal for apartments and townhouses
Suitable for strata developments
Improved durability
Premium installation finish
Although it costs more than foam underlay, the acoustic performance is significantly better.
Foam vs Rubber Underlay
Feature | Foam Underlay | Rubber Underlay |
Cost | ★★★★★ | ★★★☆☆ |
Noise Reduction | ★★★☆☆ | ★★★★★ |
Comfort | ★★★★☆ | ★★★★★ |
Durability | ★★★★☆ | ★★★★★ |
Apartments | Good | Excellent |
Residential Homes | Excellent | Excellent |
For most family homes, foam underlay provides outstanding value.
For luxury homes, apartments and commercial projects, rubber acoustic underlay is generally the better investment.
Underlay for Concrete Slabs
Concrete slabs can naturally release moisture over time.
If you're installing a floating floor over concrete, your underlay should include an integrated moisture barrier or vapour barrier to help protect the flooring. For the 3mm Rubber, you will need to lay black plastic or a moisture barrier prior to install, the rubber does not include an intergrated barrier.
Before installation, the slab should always be:
Clean
Dry
Structurally sound
Within Australian Standard tolerances
Moisture tested where required
Remember, underlay is designed to manage normal moisture vapour—not active water leaks or hydrostatic pressure.
Underlay for Timber Subfloors
When installing over timber flooring or particleboard subfloors, moisture protection is generally less of a concern than acoustic performance.
A quality underlay helps:
Reduce creaking sounds
Improve comfort
Minimise minor imperfections
Reduce impact noise between rooms
Does Hybrid Flooring Need Additional Underlay?
In most cases, no.
Most modern premium hybrid flooring—including Imperial Flooring Australia's 8mm and 9mm Hybrid Flooring ranges—already features a pre-attached acoustic underlay.
Installing a second layer of underlay underneath hybrid flooring can create excessive movement, placing stress on the click-lock joints and potentially leading to joint failure or warranty issues.
Always follow the flooring manufacturer's installation instructions before installing any additional underlay.
Can Underlay Fix an Uneven Floor?
No.
This is one of the biggest misconceptions during flooring installation.
Underlay is designed for cushioning and acoustic performance—not levelling.
If the subfloor contains high spots, low spots or excessive variation, it should be corrected before installation using grinding or a suitable self-levelling compound.
Australian Standards generally require subfloors to be within 3mm over a 3-metre straight edge before floating flooring is installed.
Common Underlay Mistakes
Avoid these common installation mistakes:
Purchasing the cheapest underlay available
Installing carpet underlay beneath floating flooring
Using additional underlay beneath hybrid flooring with attached backing
Installing over uneven subfloors
Ignoring moisture testing on concrete slabs
Failing to tape joins in the moisture barrier
Choosing the wrong acoustic rating for apartments
Using the correct underlay from the beginning helps prevent unnecessary repairs and improves the overall performance of your flooring.
Frequently Asked Questions
Is thicker underlay always better?
No. A thicker underlay doesn't necessarily provide better performance. Underlay should be compatible with your flooring's click-lock system and installation requirements.
Can I install floating flooring without underlay?
Engineered timber and laminate flooring installed as floating floors require underlay. Installing without it can affect comfort, acoustics and warranty coverage.
Which underlay is best for apartments?
A high-density acoustic rubber underlay is generally recommended where superior sound reduction or strata compliance is required.
Does underlay stop moisture?
Quality underlays with an integrated vapour barrier help protect floating floors from normal moisture vapour coming through concrete slabs, but they will not stop active water leaks or rising hydrostatic pressure.
Can underlay level my floor?
No. Underlay is not a substitute for proper floor preparation. Uneven subfloors should be ground or levelled before installation.
Our Recommendation
For the majority of Australian homes, a quality 3mm foam underlay with an integrated moisture barrier offers the ideal balance of comfort, performance and affordability for floating engineered timber and laminate flooring.
If you're installing flooring in an apartment, townhouse or premium home where acoustic performance is a priority, investing in a 3mm acoustic rubber underlay is well worth the additional cost.
No matter which option you choose, proper subfloor preparation is equally important. Ensuring the subfloor is clean, dry, level and structurally sound will maximise the performance, appearance and lifespan of your new floating floor.
Final Thoughts
Choosing the best underlay for floating floors isn't simply about what's cheapest—it's about selecting the right foundation for your flooring.
The correct underlay reduces noise, improves comfort, protects against moisture and helps your flooring perform as intended for years to come.
Whether you're installing engineered timber flooring or laminate flooring, investing in a quality underlay is one of the smartest decisions you can make during your flooring project.
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