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17.5(2.5)x400x3900 Maxi Unfinished Long & Wide Oak Flooring

£95.00 ex VAT per m2(£114.00 inc VAT per m2)

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If you would like to furnish your space with an impressive long and wide engineered oak floor then our maxi unfinished oak flooring could be perfect. The maxi unfinished oak flooring is a distinguished design that can be finished on site to your preferred specifications. The boards are a bold 400mm wide x 3900mm long and are usually available for delivery to you within 2-4 days.

The scale of our boards can be seen from the gallery images. One of the images is our 189mm wide lacquered on top of our maxi unfinished flooring. You can clearly see the variance in size between a standard and long and wide plank.

Not only is this long and wide engineered oak flooring impressive in size; you can create your own finish to make it even more impressive in appearance.

Unlike the Maxi Swiss that is scraped and prefinished with waxoil, this is our Maxi Unfinished Oak Flooring, which is sanded smooth ready for finishing on site to your requirements.

Our Maxi range of engineered oak flooring have large boards and will provide a fantastic appearance within any large room or area when installed. This wide and long engineered oak is ideal for use in large open-plan apartments or barn renovations because its dimensions are suited to such areas.

Lengths are mostly 3.9 meters long and the overall width of the single strip face is 400mm, giving an appearance that few other flooring products can.

The overall 20mm thickness is made up of a 2.5mm face or wear layer of European oak and is bonded to a centre core of 10mm Birch plywood. That is then bonded to the bottom stabilising base board of 5mm oak again. This structure provides excellent durability, stability and strength. Please Note – These boards have been sanded back from our Maxi Swiss finished boards, therefore, each board might not be finished to 2.5mm wear layer. We allow up to 0.1mm of a wear layer. This is due to taking away the top finish and the hand scraped effect away from the maxi Swiss boards when sanding down.

Our Maxi Unfinished oak flooring range has been designed to provide a natural finish. This is intended to appear as if it has been installed for many years, with slight variances between some boards.

Important Notes

  • Each enquiry and order is handled individually to ensure the efficient organisation of your delivery. We will contact you to discuss your options and liaise with the courier network so that delivery of your beautiful Maxi flooring arrives at a convenient time.
  • Due to the size and weight of these 400mm wide by 3900mm long engineered oak boards, we advise that more than one person be available on site to help offload when the delivery arrives.
  • Free samples of our Maxi range are unfortunately not available through our website, please contact us via email or telephone to arrange a sample if required.

Additional information

Weight 200 kg

Unfinished and sanded for site finishing

Board Thickness

Board Width


@3900 Long

Oak Wear Layer




Moisture Content

6-9% on arrival to site.


5mm Oak / 10mm Birch / 5mm Oak: Structural


TG4: T&G sides & ends, all micro bevelled

Length Tolerance

+/- 1.0mm

Width Tolerance

+/- 0.5mm

Thickness Tolerance

+/- 0.5mm

m2 Per Carton

3.12 for 3900mm long carton

Installation Method

Float, Glue Down, Nail/Screw Down

Suitable for UFH?


Product Code


Free Sample Available?


Our Maxi flooring range of products can be nailed down or screwed down to a timber subfloor, or glued down with flexible adhesive.

Details of these methods can be found in our Fitting Guidelines guide.

This product is suitable for installation over UFH but due to its size, proper acclimatisation is vital, whilst ongoing maintenance is required to monitor/control the surrounding humidity levels to minimise dimensional movement and change.


Although our Maxi engineered products have an underside of oak and high quality Birch plywood, and are designed to provide excellent stability after installation, they’re still constructed of all natural products.

After proper and sufficient acclimatisation, the conditions during installation should be maintained as consistently as possible thereafter for optimum performance and to avoid dimensional movement of each board within the finished floor.

For information on important, ongoing maintenance, please refer to our Care & Maintenance guide.

Weather, Humidity, Temperature and the Ongoing Maintenance of Your Flooring
Because oak is a natural, hygroscopic (water absorbent) material, and its dimensions are directly relative to its moisture content, we must control and maintain the relative humidity within our homes to enable the moisture content of our oak flooring to remain constant. This will ensure stability of each board within the finished floor, because failure to do this may force these boards to change dimensionally and structurally. This is not at all a fault of the flooring itself but all to do with the conditions that it’s being forced to endure.

Here’s an example of what can happen, when the outdoor temperature is 0°C
The maximum amount of water that a cubic metre of air can hold at this temperature is 5 grams, so when you bring this cubic metre of air inside and heat it to 25°C, the relative humidity drops to only 23%. We actually recommend a minimum of 40% for optimum floor stability (incidentally, this is also the level that health experts recommend for our bodies too, so good for our floor and good for us).

But it gets worse as the temperature outside falls lower, and this is why the air inside any heated building in the winter can become too dry, which can obviously have an effect on our flooring (and our bodies).

When relative humidity is allowed to drop too low, our flooring is forced to lose moisture itself and will try to curl upwards towards the dry air (similar to a piece of bacon under a grill) in an effort to find moisture.Any time the temperature outside is well below freezing, relative humidity inside will be below 20% unless you do something to increase it, and not increasing it can have a devastating effect on your oak floor.

Our 20 x 400 x 3900 Maxi Engineered Oak flooring is constructed as a multilayer board, consisting of a 2.5mm single strip of solid European oak face or wear layer, that is bonded to a 10mm Birch plywood core section that is in turn bonded to another stabilising layer of 2.5mm oak. Please Note – These boards have been sanded back from our Maxi Swiss finished boards, therefore, each board might not be finished to 2.5mm wear layer. We allow up to 0.1mm of a wear layer. This is due to taking away the top finish and the hand scraped effect away from the maxi Swiss boards when sanding down.

This structure, when fully bonded together, provides the strength and stability required for such a huge oak floor board.

We recommend using either the full face glue down method or nail/screw down method for installation because of the massive width that our Maxi products provide.

  • 20mm overall thickness (2.5mm oak/10mm Birch/5mm oak)
  • 2.5mm thick single strip oak face 400mm wide
  • 3.9 metres long
  • Mixed Grade, with some open features for character
  • Unfinished and sanded smooth, ready for finishing on site
  • Various size knots are included, some filled and sanded, some left open as features
  • Moisture Content 8 – 12%
  • Micro bevelled sides
  • TG4 and supplied with loose tongues for end joints
  • Carton size varies but 3.9m planks are supplies as 2 per pack, so 3.12m2
  • Suitable for installation above UFH