20 mm Flooring
- 5 days ago
- 3 min read
20mm is not thick: It is Correct
In New Zealand, 20 mm timber flooring has been the benchmark for decades.
Long before engineered boards entered the market, solid timber floors were installed at 18-20 mm. Builders, architects, and installers worked with it because it delivered consistent results across structure, transitions, and long-term performance.
Today, with modern engineered oak, that same 20 mm thickness remains the gold standard. Not because it is traditional, but because it still works better than anything else.
20 mm Flooring is the Foundation Everything Aligns To
Flooring does not exist in isolation. It needs to integrate seamlessly with the rest of the build.
The reason 20 mm continues to lead is simple:
It aligns with how homes are actually constructed in New Zealand.
At 20 mm, your flooring works naturally with:
Carpet systems (including thick underlay)
Tile setdowns
Aluminium joinery
Door thresholds
Wet area detailing
This is where thinner flooring often creates problems. It forces adjustments, packers, trims, and compromises that should not be necessary.
20 mm Flooring Creates Seamless Transitions to Carpet
Carpet underlay alone is a minimum of 12 mm + carpet.
When paired with standard flooring build-ups, a 20 mm oak floor allows for:
Clean, level transitions
Minimal height difference
No bulky trims or awkward ramps
The result is a smooth, consistent flow between spaces.
This is not just aesthetic. It is a sign of a well-resolved build.
20 mm Flooring Delivers Flush Finishes with Joinery
Most aluminium door and window joinery in New Zealand is designed around a 20 mm finished floor level.
This means when you install a 20 mm oak floor:
The flooring runs flush to standard aluminium door thresholds
Internal and external transitions are seamless
No additional adjustments or workarounds are required to standard joinery
It is a simple alignment, but one that makes a significant difference to the overall finish of a home.
20 mm Improves Performance in Wet Area Transitions
One of the biggest advantages of 20 mm flooring is how it works alongside tiled areas.
A 20 mm timber floor allows the tiler to work down from that height.
This creates:
A natural slope within tiled wet areas
Better water containment
Reduced risk of moisture moving onto timber
In spaces like bathrooms, ensuites, and laundries, this is a critical performance detail.
It is not just about how it looks. It is about how the home functions over time.
20 mm Works with Underfloor Heating
There is a common assumption that thinner floors perform better with underfloor heating.
In reality, 20 mm engineered oak is a proven solution across both hydronic and electric systems.
Why?
Because performance is not just about thickness. It is about stability.
A well-constructed 20 mm engineered board:
Minimises movement through heating cycles
Maintains structural integrity
Delivers consistent, even warmth
Rather than quick heat spikes, you get a more balanced and comfortable heat output across the floor.
This is what matters in everyday living.
20 mm is Built for Longevity
The durability of a floor is not just about the surface. It is about the structure beneath it.
At 20 mm, engineered oak flooring offers:
Greater structural strength
A more solid feel underfoot
Compatibility with long-term refinishing
When paired with a thick wear layer, it allows the floor to be restored rather than replaced, extending its life for decades.
20 mm Simplifies the Build
One of the most overlooked benefits of 20 mm flooring is how much it simplifies construction.
There is no need to:
Adjust heights across different finishes
Introduce unnecessary trims
Compensate for inconsistent levels
Everything aligns as it should.
And when everything aligns, the result is cleaner, more efficient, and more considered.
Final Thought: 20 mm is Not a Feature. It is the Standard
In a market full of thinner alternatives and engineered shortcuts, 20 mm stands apart for one reason.
It is proven.
It has worked for decades in New Zealand homes, and with modern engineered construction, it performs even better today.
From seamless transitions to compatibility with underfloor heating, 20 mm is not just a dimension.
It is the foundation that everything else works around.
