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15(4)x189mm ThruFlow Brushed & Natural Oiled (designed for UFH)

£38.00 ex VAT per m2(£45.60 inc VAT per m2)

In stock

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15mm Thick, 4mm Oak Wear Layer, 189mm Width, 1860mm In Length – Brushed & Natural Oiled Oak Flooring, Specially Designed For Under Floor Heating.

Our 15mm Thru-Flow Engineered board has a Thermal Conductivity of 0.12533 W/(m’K) compared to our standard engineered boards without pre-drilled hole boards of 0.10914 W/(m’K). 

This unique and exclusive product has been specifically designed for use with underfloor heating, with a pre-drilled plywood underside that allows the heat from the under floor heating to travel through it more easily. This simple improvement in design creates a better ‘through-flow’ of heat and means that the heating efficiency is improved by approximately 25-35%, so the cost saving on your heating bills will in time, actually pay for your flooring! Brushed and natural oiled engineered oak flooring is a stunning oak floor for any home and is by far one of our most popular engineered oak floors; this is why we have used it for our ThruFlow flooring.

This engineered oak flooring is 15mm thick and 189mm wide; the construction of the board being made up from 11mm of Eucalyptus plywood underside that is fully bonded to a 4mm French oak wear layer.

ThruFlow brushed and natural oiled engineered oak flooring is single strip oak, which showcases the extra width available when ordering from our engineered oak flooring range.

The brushed and natural oiled finish is achieved by ‘brushing’ the face of the planks during manufacture, which removes the slightly softer fibres of the oak. After the oak has been brushed, it is oiled with a natural waxoil, creating a durable finish to the oak flooring. After the waxoil is applied, the brushing that occurred during manufacture enhances the beautiful grain features of natural oak, resulting in a slightly textured and natural looking ‘oak-like’ surface.

This finish is very easy to maintain and should only ever require a light sanding and another coat of wax oil to bring it back to pristine condition if/when required (depending on wear and tear).ThruFlow brushed and natural oiled engineered oak flooring should never require a total re-finish, which increases its lifespan and reduces your maintenance costs.

Any open natural features such as knots are filled in on our ThruFlow brushed and natural oiled engineered oak flooring, creating a fuller and more blended look that still provides an accent of the natural features in the overall appearance of the flooring.

Because of the textured finish, marks and scratches don’t show up as much as on a smooth finish and because the waxoil colour is natural, if you ever want to darken the colour you can apply another coat of waxoil in whatever colour you choose to achieve the exact finish that you want. Brushed and natural oiled engineered oak flooring gives you the freedom and flexibility to create your own floor look, which fits in perfectly with the rest of your room and your own personal taste.

Brushed and natural oiled engineered oak flooring is one of the most versatile oak floors we stock and looks great in any room, easily co-ordinating with and complementing your existing décor. If you’re looking for a floor that is hard wearing and easy to maintain with a great natural look; one that you can change simply by adding another coat of waxoil to adjust the colour, then brushed and natural oiled engineered oak flooring is for you.

Additional information

Weight 27 kg

Brushed & Oiled, finished with natural colour Waxoil

Board Thickness

Board Width


Approx 85% @ 1830mm long, 15% shorter

Oak Wear Layer




Moisture Content

6-9% on arrival to site.


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


4mm Oak on 11mm pre-drilled Eucalyptus plywood

Length Tolerance

+/- 1.0mm

Width Tolerance

+/- 0.2mm

Thickness Tolerance

+/- 0.5mm

Carton Size and Weight

1860 x 195 x 130 weighing 30kg each

m2 Per Carton


m2 Per Pallet

110.8 (40 cartons)

Installation Method

Float, Glue Down, Nail/Screw Down

Suitable for UFH?

Yes: designed specifically for UFH

Product Code


Free Sample Available?


Can be floated, nailed down or glued down – and suitable for installation over UFH.

For more information on these fitting methods, please see our Fitting Guidelines guide.

This product is suitable for installation over UFH, as long as its surrounding conditions are maintained and controlled as required.

The multiply back construction of our Engineered Oak flooring provides much greater stability than Solid Oak when subjected to varying levels of heat, humidity, and moisture. This also enable the boards to be manufactured a lot wider than solid without risk of cupping, which is associated with the wide solid oak boards available.

This stability allows the floor to be installed as a floating floor where conditions permit, directly onto concrete or timber subfloors, and is ideal for floating floor installation over an underlay that can provide your floor with extra protection from possible moisture attack from beneath. Click here for more information about the Underlay products that we can supply.

Engineered Oak can also be fitted above underfloor heating when the correct installation guidelines are followed and the necessary levels of heat, humidity and moisture are maintained by the owner after installation.

We can supply a Self-Regulating UFH System that’s perfect for use with our Oak Flooring because it never overheats, making it safe and super energy efficient.


Sometimes the plywood backed engineered boards will seem as if they are ‘bowed’ from end to end when they are first removed from the packaging. This is very common with a plywood backed product because of the difference in molecular structure of the solid oak face and the plywood backing.

It is not a fault with the board and should be expected. It does not cause any problems during installation because of the required staggered joint fixing for an oak floor. Obviously as each board is ‘surrounded’ when fixed, by at least another 4 boards, it is straightened and aligned perfectly every time. In fact, some fitters claim this actually strengthens the floor further.

NB: Please note that our 15mm Engineered boards are not structural grade and when fitted using the floating floor method over large areas or over an uneven subfloor, some ‘give’ may be present within the floor after installation.

In such situations (or where there’s any risk of this happening) we advise that the boards should be installed by fixing down, either by nail or glue, depending on your subfloor.

One way of avoiding this challenge is to install our structural grade 21mm board instead – although more expensive per M2, you should still save money if the only method of fixing the 15mm board available is to glue down because this can add another £6-£7 per M2 to your cost.

Although our engineered products have an underside of high quality plywood and are designed to provide extra 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.

15 x 189 Plywood Backed ThruFlow UFH Efficient - Available as Brushed & Natural Oiled Specifically designed for installation above UFH 25-35% improved UFH efficiency

Our 15mm ThruFlow Engineered Oak is constructed as a multilayer board, consisting of a Solid European Oak face or wear layer of full 4mm, with an 11mm quality plywood backing that forms the T&G, and provides a good strong underside suitable for installation by nailing, gluing or floating. Our Engineered Boards do not have a softwood core and because of this are strong enough to be fitted using any of the 3 common methods; Glue Down, Nail Down or Float.
  • 15mm Thick
  • 189mm Wide
  • Single Strip Oak Face
  • Mixed Grade (grades explained below)
  • 15mm (7-Ply) Eucalyptus Plywood Underside - Factory Pre-Drilled (for lower thermal resistance)
  • ‘Thermostabile’ Adhesive
  • Full 4mm Wear Layer of European Oak
  • 75% Lengths of 1830mm
  • 25% Lengths of 610mm, 915mm or 1220mm
  • Moisture Content 6 – 9% (this can be reduced during acclimatisation)
  • Micro Bevelled Sides & Ends
  • TG4 End Matched
  • 2.77m2 Per Carton
  • 110.8m2 Per Pallet
  • Extra Important Detail;
    • 15mm Thickness Specifically Designed for Installation Above UFH
    • Unique & Exclusive Pre-Drilled & Concealed Hole Pattern Within Plywood Base (improved efficiency of UFH system)
    • ‘Thermostabile’ Adhesive (provides maximum strength between plies)
    • Sealed Underside for Improved Moisture Protection (reduces risk of ‘cupping’ after installation)
    • Very Accurate Machining Tolerances for Fast & Simple Fitting (saves on fitting costs)
    • Angled T&G Joint for Excess Adhesive (reduces risk of excess adhesive reaching the surface)
  • All our flooring products are machined to very accurate machining tolerances for fast and simple fitting.
  • Length Tolerance: +/- 1.0mm
  • Width tolerance: +/- 0.2mm
  • Thickness Tolerance: +/- 0.5mm
Grades Explained  Grade A
  • Very few knots if any and no sapwood allowed
  • Clear and consistent grain pattern
  • Very few natural features
  • Slight colour difference allowed
Grade B
  • Small, live knots allowed up to 15mm
  • More natural grain pattern and filled dead knots up to 15mm allowed
  • More natural features allowed
  • More natural colour difference allowed
  • Sapwood allowed up to 10% of face area
Grade C
  • Bigger knots allowed, some repaired with filler before being sanded
  • More natural grain pattern allowed
  • More natural features allowed
  • More natural colour difference allowed
  • Sapwood allowed up to 15% of face area
Grade D
  • Large knots allowed, some repaired with filler before being sanded
  • All natural grain pattern allowed
  • Most natural features allowed
  • Significant natural colour difference allowed
  • Sapwood allowed up to 30% of face area
Celtic Character Rustic
  • Contains all of the above grades and also some lower grades
  • Lower grades allow open natural defects that are repaired with dark filler before being sanded
  • All natural features allowed
  • All colour differences allowed
  • All sapwood variances allowed

Important: We order our flooring in full containers that hold 12 pallets each, so the grade mix that you receive and see within your finished floor will obviously depend on the amount ordered, because being a natural product means that different batches of flooring will obviously contain varying amounts of each grade. Because we order a minimum of 4 containers per order, sometimes the 25% grade mix can vary within the containers and yet still meet our stringent quality control.