Unfinished Engineered Oak Flooring

Why choose unfinished engineered oak?

• Any colour: finish it in exactly the tone you want, or match an existing floor.
• A seamless surface: sanding after laying levels the boards perfectly, so the floor looks like one surface.
• Sealed joints: the finish goes over the joints too, which helps keep spills on the surface.
• Square edges: many unfinished boards have square edges, for a smooth, traditional floor.
• Stable: an engineered core suits concrete and, where approved, underfloor heating.

What to plan for

Finishing on site takes time and skill. The floor must be laid, sanded, cleaned and coated, usually with two or more coats, each needing drying time, and the room cannot be used until the finish has cured. Sanding is dusty work. Most people use a professional floor sander and finisher, which you should plan for alongside the boards.

How an unfinished floor is finished

1. Lay the boards, glued or floated as the maker recommends, and let any adhesive cure.
2. Sand the floor with progressively finer grits to remove height differences and marks.
3. Vacuum thoroughly and remove all dust.
4. Apply stain or coloured oil first if you want a colour; test it on an offcut sanded the same way.
5. Apply the finish: hardwax oil for a natural, repairable look, or lacquer for low maintenance.
6. Let it cure before heavy use, rugs and furniture, as the product states.

Choosing the finish

Hardwax oil: natural, matt and easy to spot-repair; needs regular maintenance. Water-based lacquer: sealed, low-maintenance and available in matt finishes that look natural. Coloured oils and stains: white, grey, smoked and dark tones; always test first, because oak varies.

Grade and wear layer

Unfinished boards still have a wear layer that is reduced by the first sanding. Choose a board with a good oak layer (3mm or more) so it can be sanded again in future. Rustic grades are characterful and hide wear; select grades look calm.

Where unfinished oak works best

Design-led projects: where the floor colour must match a scheme. Parquet and herringbone: sanded flat after laying for a perfect pattern. Extensions: matching a new floor to an existing one. Kitchens: a lacquer over the joints helps resist spills. Never bathrooms.

Fitting unfinished engineered oak

Acclimatise the boards, check concrete with a moisture meter and glue the boards with a wood floor adhesive or float them over an engineered wood flooring underlay, as the maker recommends. Leave an expansion gap and protect the raw boards from dirt and water until finished. Fill any open knots with wood floor filler before the final sanding. Our installation guides explain each method.

Comparing samples at home

Order free samples of two or three options and put them on the floor of the room where they will be laid. Look at them in daylight and in the evening under your own lamps, next to the walls, skirting, units and furniture they will sit with. Colours and textures look different in every room and on every screen, so a few minutes with real samples is the best way to avoid a costly mistake. Stand back as well as looking close up: a floor is mostly seen from standing height and from the doorway.

With unfinished oak, finish a few offcuts in the colours you are considering and look at them in the room: raw samples cannot show the final colour.

Common mistakes

• Choosing a colour without testing it on sanded oak.
• Walking on raw boards with dirty shoes, which marks them before finishing.
• Rushing the curing time and putting rugs down too soon.