Choosing how your new floor is installed might not sound glamorous, but it's one of the most important decisions you'll make during a flooring project. Get it wrong and you could end up with a floor that squeaks, lifts, or fails prematurely — no matter how beautiful the planks looked in the showroom. Whether you're laying engineered timber, LVP (luxury vinyl plank), or laminate, the installation method matters just as much as the product itself.
What Is a Floating Floor?
A floating floor is not fixed directly to the subfloor. Instead, the planks lock together using a click or tongue-and-groove system and simply 'float' as a single connected layer above the subfloor. A thin underlay is usually placed between the subfloor and the flooring to provide cushioning, moisture protection, and a little acoustic dampening.
Floating installation is the most common method for laminate, LVP, and many engineered timber products. It's popular with DIYers because no adhesive is required and the floor can be laid relatively quickly.
What Is a Glue-Down Installation?
Glue-down installation involves bonding each plank directly to the subfloor using a specialist flooring adhesive. This is the traditional method for solid timber and is also widely used for engineered timber and some LVP products, particularly in commercial settings or over concrete slabs.
The adhesive used matters enormously — products from manufacturers like Sika and Ardex are well regarded in the NZ trade for their flexibility and moisture resistance. A glue-down floor feels more solid underfoot and eliminates the slight 'give' some people notice with floating floors.
Head-to-Head Comparison
| Criteria | Floating | Glue-Down |
|---|---|---|
| Subfloor prep required | Moderate (level, clean, dry) | High (very flat, clean, primed) |
| Durability / stability | Good — can move slightly with temp changes | Excellent — fully bonded, very stable |
| Underfoot feel | Slightly springy | Solid, firm |
| Moisture resistance | Depends on product; underlay helps | Better bond integrity over concrete |
| Acoustic performance | Good with quality underlay | Can transmit more impact noise without underlay |
| DIY suitability | High — no specialist tools or adhesive | Low — requires experience and correct adhesive |
| Repair / replacement | Easier — planks can be disassembled | Harder — planks must be cut out |
| Suitable for underfloor heating | Check manufacturer specs carefully | Generally preferred method for UFH |
| Approximate cost guide | Lower install cost (labour saving) | Higher install cost (adhesive + labour) |
| NZ climate suitability | Good in stable interiors; allow expansion gaps | Better in high-humidity or coastal areas |
Subfloor: The Make-or-Break Factor
Regardless of which method you choose, your subfloor must be flat, dry, and structurally sound. BRANZ recommends subfloors be within 3 mm over a 1.8 m straightedge for most resilient and timber flooring installations — check your product's specific requirements as some are tighter.
For glue-down over concrete, moisture testing is critical. New concrete slabs in particular can hold significant residual moisture, and laying over a wet slab without proper testing and priming is one of the most common causes of flooring failure in NZ. Use a calibrated moisture meter and follow the adhesive manufacturer's guidelines.
For floating floors over a suspended timber subfloor (very common in older NZ homes), ensure the joists and bearers are solid and the floor doesn't flex excessively. A bouncy subfloor will stress click-lock joints over time.
NZ Climate and Building Code Considerations
New Zealand's climate varies enormously — from the humid, wet winters of Northland and the West Coast to the dry, hot summers of Central Otago. Timber and engineered timber floors expand and contract with changes in temperature and humidity. Floating floors must have adequate expansion gaps around the perimeter (typically 10–12 mm) to allow this movement without buckling.
In wet areas such as bathrooms and laundries, the NZ Building Code clause E3 sets requirements for internal moisture management. Most floating floors are not suitable for wet areas — glue-down LVP with waterproof adhesive is a far better choice here. Always check your product's warranty conditions for wet area use.
If you're installing over underfloor heating (UFH), glue-down is generally the preferred method as it ensures good thermal contact between the heating element and the floor surface. Floating floors can act as an insulating layer and reduce efficiency. Check the flooring manufacturer's specifications carefully — some floating products are approved for UFH with specific underlay types.
Cost Considerations
As a rough guide only, floating installation typically costs less in labour because it's faster and requires no adhesive or drying time. Glue-down adds the cost of the adhesive itself (which can be significant for a large area) plus longer installation time.
However, if your subfloor needs significant levelling work — which is more critical for glue-down — that can quickly close the cost gap. Get quotes that include subfloor preparation, not just the laying itself. You can find qualified local flooring installers on tradedirectory.co.nz to get accurate pricing for your specific situation.
DIY vs Hiring a Professional
Floating floors are genuinely DIY-friendly for a competent homeowner with patience and the right tools (pull bar, tapping block, spacers, and a good saw). Laminate and LVP click systems have improved dramatically and many NZ homeowners tackle these successfully.
Glue-down installation is a different story. Spreading adhesive evenly, working within the open time of the glue, and ensuring correct trowel notch size for the product all require experience. A botched glue-down job is expensive to fix. For engineered timber or solid timber glue-down, we strongly recommend hiring a qualified flooring installer.
For product inspiration and to compare underlay options, Bunnings and Mitre 10 both carry a wide range of floating floor products and accessories suitable for DIY projects.
Our Recommendation
Here's practical guidance for the most common NZ scenarios:
- Rental property or budget renovation: Floating LVP is hard to beat — durable, waterproof options available, easy to replace if damaged by tenants. Check Tenancy Services Healthy Homes requirements if you're a landlord.
- New concrete slab (e.g. new build or extension): Glue-down engineered timber or LVP after proper moisture testing. Don't rush this — let the slab cure fully.
- Older NZ villa with suspended timber floors: Floating engineered timber or laminate works well. Ensure subfloor is solid and use a good quality underlay with a moisture barrier.
- High-end renovation or underfloor heating: Glue-down engineered timber for the best feel, stability, and thermal performance. Hire a professional.
- Bathroom or laundry: Glue-down waterproof LVP only. No floating floors in wet areas.
- DIY project, first-time installer: Choose a quality floating LVP or laminate product with a forgiving click system.
When in doubt, talk to a qualified flooring installer before you buy your materials — the wrong choice can be a costly mistake.
