Can You Sand Engineered Wood Flooring?
Yes, if the wear layer allows it. The published minimums, how many times a floor can be sanded, what our boards carry and what to check before you start.
Yes, usually, and the answer sits in one number: the thickness of the oak wear layer. An engineered board is a layer of oak bonded to a core; sanding takes some of that oak away, and the floor can be sanded for as long as enough of it is left. The US National Wood Flooring Association puts it in a sentence: engineered wood can be sanded and refinished, but it cannot be done as many times as solid wood flooring. This guide sets out the published minimums, what our floors carry, and what to check before a sander touches the floor.
On this page
The wear layer decides
The wear layer is the oak you walk on. When a floor is sanded, the surface is taken back below the scratches and the old finish, and the bare wood is finished again. Each sanding removes some of the wear layer; once it is gone, the core shows and the floor cannot be sanded again. A thick wear layer allows more sandings than a thin one, and the figure on the specification is the one to look for.
The published minimums
BS EN 13489, the product standard for multi-layer parquet, defines it as a wood flooring system with a solid wood top layer of at least 2.5 mm thickness, and does not allow the top layer to fall below 2.5 mm whatever the production tolerance. That is the oak a parquet floor starts with.
For sanding, the reference most often cited is American. The NWFA reports that its Sand and Finish Guidelines state that, in general, if the wear thickness is less than 3/32 inch, the floor should not be sanded, and its programme for refinishable engineered floors asks a factory-finished smooth floor for a wear layer of 2.5 mm. 3/32 inch is a little under 2.5 mm; read together, the two sources put the working minimum at about 2.5 mm of oak.
What our floors carry
We counted the wear layer on every engineered floor in our range. 47 of the 65 have a 3 mm oak wear layer, 13 have 4 mm and 3 have 6 mm, all above that line. One, a 12 mm plank, lists a 2 mm wear layer, below the NWFA's threshold for sanding, and one walnut plank does not list a wear layer at all; for those two, ask before anyone sands. Every product page states the figure.
How many times?
No trade body we could find puts a number on it, because a light sanding removes less than a heavy one and a well-kept floor needs fewer and lighter sandings. The one sourced figure comes from a manufacturer, Kährs, which says engineered floors can be sanded up to four times depending on the thickness of the wear layer. Treat it as one maker's guidance for its own boards, not a rule for every floor.
Sanding or recoating
A worn floor does not have to be sanded. On a lacquered floor, wear that has not gone through the film is dealt with by recoating the area; an oiled floor is re-oiled where it has worn. The two care guides go through both. Sanding back to bare wood is for a floor whose finish has worn through, which is marked deeper than the finish, or whose colour is to change.
Before the sander starts
Know the wear layer: from the product page, from the paperwork, or from a board end at a threshold. Tell the floor sander the figure before they start, because a heavy pass through a thin layer cannot be undone. Then plan the finish. The Wood Handbook of the US Forest Products Laboratory describes finishing a floor in four steps: sanding the surface, applying filler, staining to achieve a desired colour and finishing with a clear coat. It adds that the detailed procedure depends largely on the species of wood and the finish chosen, and that flooring associations and manufacturers are the place to ask.
The thickest wear layer in our range is 6 mm, on boards in the natural oak, dark oak and golden oak collections; every product page states the figure.
Oil or lacquer afterwards
Once the floor is back to bare wood, the finish is chosen again. The Handbook describes film-forming finishes such as varnish as generally easier to clean, and oils as penetrating finishes that leave the surface texture intact; floors need thicker, harder films. The guide to oiled and lacquered floors weighs them room by room.
Common questions
Can you sand engineered wood flooring?
Yes, if the wear layer is thick enough. The NWFA says engineered wood can be sanded and refinished, though not as many times as solid wood flooring, and reports that a floor with less than 3/32 inch of wear layer should not be sanded.
How thick does the wear layer need to be?
About 2.5 mm or more. BS EN 13489 sets a top layer of at least 2.5 mm for multi-layer parquet, and the NWFA's threshold for sanding, 3/32 inch, is a little under that.
How many times can engineered wood be sanded?
It depends on the wear layer and on how much each sanding takes off. The only sourced number is a manufacturer's: Kährs says up to four times, depending on the thickness of the wear layer.
Can a 3 mm wear layer be sanded?
Yes, with care: 3 mm is above the 2.5 mm minimum, and a light sanding by someone who knows the figure leaves oak for later. 47 of our 65 engineered floors have a 3 mm wear layer.
Is sanding engineered wood different from sanding solid wood?
The method is the same; the margin is not. A solid board is oak throughout, an engineered board only to the depth of its wear layer, which is why the NWFA says engineered floors cannot be sanded and refinished as many times as solid wood flooring.
Every engineered floor we sell states its wear layer on the product page. We deliver town by town across the UK. Browse by town and region.
What the published standards say
Who publishes this guide
- Samples £1.99 each
- UK-wide delivery
- Advice before you order
