A layer of fine wood over a cross-laid multilayer core. It is the floor that applies when there is underfloor heating, variable humidity, or wide boards are wanted.
What it is
Wood moves. It takes up moisture from the air, swells, releases it and shrinks, and in a solid board that movement accumulates across the width: hence open joints in summer and cupping in winter. An engineered floor solves that by construction.
On top there is a layer of fine wood, the one that shows and the one that gets sanded. Underneath, a core of plies glued with the grain crossed layer to layer: each ply restrains the movement of the next. Hence the other names it goes by, multilayer and multi-ply, which describe the same thing.
When it applies
It does not always apply: if the floor has to last generations and take five sandings, solid still wins. These are the three situations where engineered is the answer rather than an alternative.
Heat from below moves the wood.
A floor over underfloor heating spends the year cycling between heat and cold. The cross-laid core absorbs that cycle; a solid board shows it in the joints.
Up to 30 cm, without opening up.
Width is what gives a floor its character, and also what makes it work hardest. Engineered reaches widths that in solid would be a risk.
Ground floor, coastal, unconditioned spaces.
Where humidity rises and falls with the season — and where nobody is going to control it — the stability of the core is worth more than the thickness of the board.
The wear layer
The difference between an engineered floor that lasts and one that disappoints is one number: the thickness of the wear layer. It is the real wood on top, and the only part that can be sanded. Three millimetres is enough for a home; for a hotel lobby or a store, six is the sensible choice.
The finish is applied at the plant, on a UV line over twenty-five metres long: every board comes out cured and even. On site that means no smell, no waiting, and no sanding dust over a project that is already finished.
Scale
On large areas a problem appears that does not exist in an apartment: colour across batches. Two lots of the same species do not come out identical, and in a tower corridor that difference reads from one end to the other. It is controlled by producing batch by batch against the approved sample.
That was done at TGLT's Venice tower: nineteen thousand square metres of flooring, with a single point of coordination, delivered according to site progress rather than all at once.
Questions
Solid is one piece of wood through the full thickness; engineered has a fine wood wear layer over a multilayer core. Solid takes five sandings or more and gets handed down; engineered is more stable and reaches widths and situations where solid is not advisable.
Yes, and it is the system that applies. The core with grain crossed between plies absorbs the heat-and-cold cycle that a solid board shows in its joints. What is defined with the project in hand is the thickness and the way it is laid.
It depends on the wear layer, not the total thickness. Three millimetres leaves room for one sanding, perhaps two; six, for several more. It is the figure worth looking at first, because it decides how many years of service the floor has ahead of it.
Yes. Engineered, multilayer and multi-ply name the same construction: fine wood on top, a cross-laid core underneath. What does change is the wear-layer thickness and whether it comes with a click joint for glueless installation.
Both exist and they do not give the same result. Glued feels firmer underfoot and takes rolling loads better; floating is laid without adhesive and without waiting, over the existing subfloor. The decision depends on use and on the construction schedule.
With the same eight worked for flooring: American and European oak, teak, walnut, viraró, curupay, guatambú and lapacho. The top layer is real wood, so the choice of species carries the same weight as in a solid floor.
Next step
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